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| Standard ID | GB/T 10125-2021 (GB/T 10125-2021) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H25 | | Classification of International Standard | 77.060 | | Word Count Estimation | 23,241 | | Date of Issue | 2021-08-20 | | Date of Implementation | 2022-03-01 | | Older Standard (superseded by this standard) | GB/T 10125-2012 | | Drafting Organization | Qingdao Iron and Steel Research Institute Nake Testing and Protection Technology Co., Ltd., Metallurgical Industry Information Standards Research Institute, China Building Materials Inspection and Certification Group Co., Ltd., Institute of Metal Research, Chinese Academy of Sciences, University of Science and Technology Beijing, Central Iron and Steel Research Institute Qingdao Institute of Marine Corrosion Co., Ltd. | | Administrative Organization | National Steel Standardization Technical Committee (SAC/TC 183) | | Proposing organization | China Iron and Steel Association | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 10125-2012 (GB/T 10125-2012) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.40 | | Word Count Estimation | 24,212 | | Older Standard (superseded by this standard) | GB/T 10125-1997 | | Quoted Standard | ISO 1514-2004; ISO 2808-2007; ISO 3574-1999; ISO 8407-2009; ISO 17872-2007 | | Adopted Standard | ISO 9227-2006, IDT | | Drafting Organization | Wuhan Institute of Materials Protection | | Administrative Organization | National Metal and nonmetal coatings Standardization Technical Committee | | Regulation (derived from) | National Standards Bulletin 2012 No. 41 | | Proposing organization | China Machinery Industry Federation | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the neutral salt spray (NSS), acetic acid salt spray (AASS) and copper accelerated acetic acid salt spray (CASS) test equipment used, a trial issue, and methods. This standard applies to metallic materials. | | Standard ID | GB/T 10125-1997 (GB/T10125-1997) | | Description (Translated English) | Corrosion tests in artificial atmospheres--Salt spray tests | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.40 | | Word Count Estimation | 12,198 | | Date of Issue | 1997/6/27 | | Date of Implementation | 1998/1/1 | | Older Standard (superseded by this standard) | GB 6458-1986; GB 6459-1986; GB 6460-1986; GB 10125-1988 | | Quoted Standard | GB 5213-1985; GB 6461-1986; GB 12335-1990; GB/T 9798-1997; ISO 6372-1-1989 | | Adopted Standard | ISO 9227-1990, EQV | | Drafting Organization | Machiney Industry Ministry Wuhan Institute of Material Protection | | Administrative Organization | National Metal and non-metal overlay Standardization Technical Committee | | Regulation (derived from) | National Standards Bulletin 2012 No. 41 | | Proposing organization | Ministry of Machinery Industry of the People Republic of China | | Issuing agency(ies) | State Bureau of Technical Supervision | | Summary | This Standard specifies the neutral salt spray (NSS), acetic acid salt spray (AASS) and copper accelerated acetic acid salt spray (CASS) equipment, reagents and methods used in the test. This standard also specifies methods to assess environmental chamber corrosive. |
GB/T 10125-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.060
CCS H 25
Replacing GB/T 10125-2012
Corrosion tests in artificial atmospheres - Salt spray
tests
(ISO 9227:2017, MOD)
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
Introduction ... 7
1 Scope ... 8
2 Normative references ... 9
3 Terms and definitions ... 10
4 Principle ... 11
5 Test solution ... 11
6 Test equipment ... 12
7 Methods of evaluating the performance of salt spray chamber ... 15
8 Test specimen ... 17
9 Placement of test specimens ... 18
10 Test conditions ... 18
11 Test period ... 19
12 Handling of test specimens after the test ... 20
13 Evaluation of test results ... 21
14 Test report ... 21
Appendix A (Informative) Comparison of clause numbers between this
document and ISO 9227:2017 ... 23
Appendix B (Informative) List of technical differences between this document
and ISO 9227:2017 and their reasons ... 24
Appendix C (Informative) A schematic diagram of the design of a salt spray
chamber with the function of treating salt spray waste gas and wastewater .. 26
Appendix D (Informative) Supplementary method for evaluating the
performance of salt spray chamber by using zinc reference specimen ... 28
Appendix E (Normative) Preparation of organic coating specimen ... 30
Appendix F (Normative) Additional information for organic coating test
specimens ... 32
Appendix G (Informative) Supplementary information about steel reference
specimen's designation ... 33
References ... 34
Corrosion tests in artificial atmospheres - Salt spray
tests
1 Scope
This document specifies the equipment, reagents, methods for neutral salt
spray (NSS), acetic acid salt spray (AASS), copper accelerated acetic acid salt
spray (CASS) tests. This document also specifies methods for evaluating the
corrosiveness of the test chamber atmosphere.
This document is suitable for evaluating the corrosion resistance of metal
materials and coatings. The tested object can have permanent or temporary
corrosion resistance, OR it may not have permanent or temporary corrosion
resistance.
This document does not specify the size and type of test specimens, the test
cycle of special products and the interpretation of results; for these contents,
refer to the corresponding product specifications.
This document is suitable for detecting discontinuities of metals and their alloys,
metal coatings, organic coatings, anodic oxide films, conversion coatings, such
as pores and other defects.
The neutral salt spray test is suitable for:
- Metals and their alloys;
- Metal coating (anodic or cathodic);
- Conversion film;
- Anodized film;
- Organic coating on metal substrate.
The acetic acid salt spray test is suitable for decorative coatings of copper +
nickel + chromium or nickel + chromium. It is also suitable for aluminum anodic
oxide films and organic coatings.
The copper accelerated acetic acid salt spray test is suitable for decorative
coatings of copper + nickel + chromium or nickel + chromium. It is also suitable
for aluminum anodic oxide films and organic coatings.
These methods are suitable for quality inspection when metal materials have
OR do not have corrosion protection. They are not suitable for sorting different
materials with corrosion resistance OR predicting the long-term corrosion
resistance of test materials.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 6461 Methods for corrosion testing of metallic and other inorganic
coatings on metallic substrates - Rating of test specimens and manufactured
articles subjected to corrosion tests (GB/T 6461-2002, ISO 10289:1999, IDT)
GB/T 9271 Paints and varnishes standard panels for testing (GB/T 9271-
2008, ISO 1514:2004, MOD)
GB/T 10123 Corrosion of metals and alloys - Basic terms and definitions
(GB/T 10123-2001, eqv ISO 8044-1999)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T
13452.2-2008, ISO 2808:2007, IDT)
GB/T 16545 Corrosion of metals and alloys - Removal of corrosion products
from corrosion test specimens (GB/T 16545-2015, ISO 8407:2009, IDT)
GB/T 30786 Paints and varnishes - Guidelines for the introduction of scribe
marks through coatings on metallic panels for corrosion testing (GB/T
30786-2014, ISO 17872-2007, IDT)
GB/T 30789.1 Paints and varnishes - Evaluation of degradation of coatings
- Designation of quantity and size of defects ,and of intensity of uniform
changes in appearance - Part 1: General introduction and designation
system (GB/T 30789.1-2015, ISO 4628-1:2003, IDT)
GB/T 30789.2 Paints and varnishes - Evaluation of degradation of coatings
- Designation of quantity and size of defects, and of intensity of uniform
changes in appearance - Part 2: Assessment of degree of blistering (GB/T
30789.2-2014, ISO 4628-2:2003, IDT)
GB/T 30789.3 Paints and varnishes - Evaluation of degradation of coatings
- Designation of quantity and size of defects, and of intensity of uniform
changes in appearance - Part 3: Assessment of degree of rusting (GB/T
30789.3-2014, ISO 4628-3:2003, IDT)
to the pH value of the collected spray solution.
5.2.2 Neutral salt spray test (NSS test)
The pH value of the test solution (5.1) shall be adjusted, so that the pH value
of the spray solution, which is collected in the salt spray chamber (6.2), is
between 6.5 and 7.2, at 25 °C ± 2 °C. Use a potentiometric pH meter to measure
the pH value. The pH value shall be measured, by an electrode suitable for
weakly buffered sodium chloride solution (dissolved in deionized water). The
pH value of the solution is adjusted, by a solution which is prepared by analytical
pure hydrochloric acid, sodium hydroxide or sodium bicarbonate.
Note: The loss of carbon dioxide in the solution, during spraying, may cause pH
changes. Take corresponding measures, such as heating the solution to more than
35 °C, before sending it into the instrument or preparing the solution with new boiling
water, to reduce the carbon dioxide content in the solution.
5.2.3 Acetic acid salt spray test (AASS test)
Add appropriate amount of glacial acetic acid (CH3COOH) to the sodium
chloride solution, which is prepared in accordance with 5.1, to ensure that the
pH value of the collected liquid, in the salt spray chamber (6.2), is between 3.1
and 3.3, at 25 °C ± 2 °C. If the pH value of the initially prepared solution is 3.0
~ 3.1, the pH value of the collected solution is generally within the specified
range. Use a potentiometric pH meter to measure the pH value. The pH value
shall be measured, by an electrode which is suitable for weakly buffered sodium
chloride solution (dissolved in deionized water). The pH value of the solution is
adjusted with a solution, which is prepared by analytical pure glacial acetic acid
(CH3COOH), sodium hydroxide (NaOH) or sodium bicarbonate (NaHCO3).
5.2.4 Copper accelerated acetic acid salt spray test (CASS test)
In the salt solution, which is prepared according to 5.1, add copper chloride
dihydrate (CuCl2 • 2H2O)], which has a concentration of 0.26 g/L ± 0.02 g/L [that
is, 0.205 g/L ± 0.015 g/L anhydrous copper chloride (CuCl2)]. The method of
adjusting the pH value of the solution is the same as 5.2.3.
5.3 Filtration
If necessary, filter the solution, before adding it to the storage tank of the
equipment, to remove any solid matter, that may block the spray holes of the
device.
6 Test equipment
6.1 Component protection
6.1.1 All components, which are in contact with salt spray or test solution, shall
be made of corrosion-resistant materials, which do not affect the corrosiveness
of the solution.
6.1.2 The test specimen support shall be such, that different types of substrates
do not affect each other, meanwhile the support itself shall not affect the test
specimen.
6.2 Salt spray chamber
6.2.1 The spray in the chamber shall be evenly distributed. For the chambers,
which have a capacity of less than 0.4 m3, due to the capacity restriction, it shall
carefully consider the effect of the loading of the chamber on the spray
distribution and temperature. The salt spray shall not be sprayed directly on the
test specimen; however, it shall be distributed over the entire chamber AND fall
naturally on the test specimen. The top of the box shall be designed to prevent
the accumulated solution from dripping onto the test specimen, during the test.
6.2.2 The shape and size of the salt spray chamber shall be such, that the
collection rate of the solution in the chamber meets the requirements of 10.3.
6.2.3 Based on considerations of environmental protection, the equipment
should adopt appropriate methods, to treat exhaust gas and waste liquid.
Note: The design diagram of the salt spray chamber is as shown in Appendix C (see
Figure C.1 and Figure C.2).
6.3 Heating and temperature control device
The heating system keeps the temperature inside the chamber up to the
requirements of 10.1. The distance, between the temperature measurement
area and the inner wall of the chamber and the heat source, shall not be less
than 100 mm.
6.4 Spray device
6.4.1 The spray device consists of a compressed air supply, a salt water tank,
one or more sprayers.
6.4.2 The compressed air, which is supplied to the sprayer, shall pass through
the filter, to remove oil and solid particles. The spray pressure shall be
controlled within the range of 70 kPa1) ~ 170 kPa. The pressure value is usually
98 kPa ± 10 kPa; however, it can be changed, according to the type of chamber
and sprayer used.
6.4.3 In order to prevent the evaporation of moisture in the mist (aerosol), the
1 1 kPa = 1 kN/m2 = 0.01 atm = 0.01 bar = 0.145 psi.
......
GB/T 10125-2012
Corrosion tests in artificial atmospheres - Salt spray tests
ICS 25.220.40
A29
National Standards of People's Republic of China
Replace GB/T 10125-1997
Artificial atmosphere corrosion test salt spray test
(ISO 9227.2006, IDT)
Released on.2012-12-31
2013-10-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword III
Introduction IV
1 range 1
2 Normative references 1
3 test solution 2
3.1 Preparation of sodium chloride solution 2
3.2 Adjust pH 2
3.3 Filter 2
4 Test equipment 2
4.1 Equipment Material 2
4.2 Salt spray box 3
4.3 Temperature control device 3
4.4 Spray device 3
4.5 Salt spray collector 3
4.6 Reusing 3
5 Method for evaluating the corrosion performance of salt spray tanks 4
5.1 General 4
5.2 Neutral salt spray test (NSS test) 4
5.3 Acetate spray test (AASS test) 5
5.4 Copper accelerated acetate spray test (CASS test) 5
6 sample 6
7 sample placement 6
8 Test conditions 7
9 test cycle 7
10 Treatment of samples after test 7
11 Evaluation of test results 8
12 Test report 8
Appendix A (informative) Salt spray box design diagram 9
Appendix B (informative) Supplementary method for evaluating the corrosion of salt spray tanks using zinc reference samples 11
Appendix C (Normative) Test Template for Organic Coatings 13
Appendix D (Normative) Test Template for Organic Coatings Need Supplementary Information 14
Appendix E (informative) Supplementary information on the steel reference sample number 15
Appendix NA (informative appendix) China's document 16 with consistent correspondence with the normatively cited international documents in this standard
Reference 17
Figure A.1 Design sketch of the salt spray box Front view 9
Figure A.2 Design of the salt spray box Figure 10
Table 1 Guidance value of hot water temperature in saturated tower 3
Table 2 Test conditions 7
Table B.1 Allowable range of mass loss for zinc reference specimens and steel reference specimens when verifying corrosion performance of salt spray tanks
Table E.1 This standard steel reference sample grade is compared with domestic and international standard grades. Table 15
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 10125-1997 "Man-made atmosphere corrosion test salt spray test", compared with GB/T 10125-1997
The changes are as follows.
--- Added introduction;
--- Increased the scope of application (see Chapter 1);
--- Normative references have been re-adjusted;
--- Modified the concentration of sodium chloride solution, and made more detailed provisions on the adjustment method of the pH value of the solution (see Chapter 3);
--- Revised the volume of the salt spray box is not less than 0.4m3 (see 4.2);
--- Supplementation of salt spray device requirements (see 4.4);
--- Increased specific requirements for re-use (see 4.6);
--- Added the provisions of the corrosion test method for the AASS test, and completely revised the corrosion performance test method of the CASS test.
The method partially modifies the basic requirements of the test method for the corrosion performance test of the NSS test. Pretreatment, test time and after test
Processing and other aspects (see Chapter 5);
--- Increased requirements for organic coating test panels (see Chapter 6);
--- Modified the placement of the sample (see Chapter 7);
--- Added new requirements for test conditions (see Chapter 8);
--- Increased the method of sample treatment after the test (see Chapter 10);
--- Increased evaluation methods for organic coatings (see Chapter 11);
--- Increased the requirements for test reports (see Chapter 12);
--- Revised the design sketch of the salt spray box (see Appendix A);
--- Added a supplementary method for evaluating the corrosion performance of salt spray tanks using zinc reference samples (see Appendix B);
--- Added test panels for organic coatings (see Appendix C);
--- Added additional information on the test template for organic coatings (see Appendix D);
--- Added additional information on steel reference sample grades (see Appendix E).
This standard uses the translation method equivalent to ISO 9227.2006 "artificial atmosphere corrosion test salt spray test".
The documents of our country that have a consistent correspondence with the international documents referenced in this standard are shown in Appendix NA.
This standard has made the following editorial changes.
--- Cancel the preface of ISO 9227.2006, adding the preface to this standard.
--- Replace "this International Standard" with "this standard".
--- Added the informative Appendix NA, the Chinese document that has a consistent correspondence with the international documents referenced in this standard.
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-Metallic Coatings (SAC/TC57).
This standard was drafted. Wuhan Materials Protection Research Institute, Maanshan Dingtai Rare Earth Technology Co., Ltd., Tongxiang Tiesheng line equipment
Limited company, Ningbo High-tech Zone Yuanchuang Technology Co., Ltd., Wuhan Material Insurance New Materials Co., Ltd., Wuhan University.
The main drafters of this standard. Zhang Yan, Jiang Lei, Liu Shuo, Shi Zhimin, Liu Yulu, Shen Hongwei, He Yingchun, Li Xinli, Li Anzhong, Qi Qifeng,
Ding Weijun, Xie Fan, Zhang Qiang, Li Zhi.
The previous versions of the standards replaced by this standard are.
GB/T 10125-1997.
introduction
Due to many factors affecting metal corrosion, a single salt spray resistance cannot replace the performance against other media, so this standard obtains
The test results cannot be used as a direct guide to the corrosion resistance of the tested materials in all environments of use. At the same time, the nature of various materials in the test
Can not be used as a direct guide to the corrosion resistance of these materials in use.
Nevertheless, the method specified in this standard can still be used as a method to test the material with or without corrosion resistance.
The salt spray test can be used as a test method to quickly evaluate defects such as discontinuities, pores and breakage of organic and inorganic coatings.
Process quality comparison of samples with similar overlays.
From the comparison results of the salt spray test, it is concluded that the long-term corrosion behavior of different coating systems is unreliable because these coating systems are actually
The corrosion resistance in the environment is significantly different from the corrosion resistance in the salt spray test.
Artificial atmosphere corrosion test salt spray test
1 Scope
This standard specifies equipment used in neutral salt spray (NSS), acetate spray (AASS) and copper accelerated acetate spray (CASS) tests.
Agents and methods.
This standard is applicable to the evaluation of the corrosion resistance of metal materials and coatings. The tested objects may have permanent or temporary corrosion resistance.
It may also be non-permanent or temporary.
This standard also specifies methods for assessing the environmental corrosivity of the test chamber.
This standard does not specify the sample size, the test cycle of the special product and the interpretation of the results, which can be found in the corresponding product specifications.
This test is applicable to the detection of discontinuities in metals and their alloys, metal coatings, organic coatings, anodized films and conversion coatings, such as
Gap and other defects.
The neutral salt spray test applies to.
---metal and its alloys;
---Metal coating (anodizing or cathodic);
---Conversion film;
--- anodized film;
--- Organic coating on the metal substrate.
The acetate spray test is applicable to copper-nickel-chromium or nickel-chromium decorative coatings, as well as to anodized aluminum coatings.
The copper accelerated acetate spray test is suitable for copper-nickel-chromium or nickel-chromium decorative coatings, as well as for anodized aluminum coatings.
This test is applicable to the performance comparison of metal materials with or without corrosion protection, and is not suitable for corrosion resistance of different materials.
Sexual sorting.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
ISO 1514.2004 Paint and varnish standard test panels (PaintsandvarnishesStandard panels fortesting)
ISO 2808.2007 Determination of film thickness of paints and varnishes (PaintsandvarnishesDeterminationoffilm
Thickness)
ISO 3574.1999 Commercial grade and stamping grade cold rolled carbon steel sheet (Cold-reducedcarbonsteelsheetofcommer-
Cialanddrawingqualities)
ISO 8407.2009 Corrosion of metals and alloys Corrosion corrosion products (corrosionofmetalsand)
Aloys Removalofcorrosionproductsfromcorrosiontestspecimens)
ISO 17872.2007 Guidelines for the marking of scratches on sheet metal coatings for the lacquering and varnish corrosion test (Paintsandvarnishes
Guidelinesfortheintroductionofscribemarksthroughcoatingsonmetalicpanelsforcorrosiontes-
Ting)
3 test solution
3.1 Preparation of sodium chloride solution
The reagents used in this test are reagents of chemical purity or chemical purity. Conductivity is not higher at a temperature of 25 °C ± 2 °C
Distilled water of 20 μS/cm or sodium chloride dissolved in deionized water is formulated to a concentration of 50 g/L ± 5 g/L. Collected spray concentration
It should be 50g/L ± 5g/L. At 25 ° C, the prepared solution has a density in the range of 1.029 to 1.036.
The copper content in sodium chloride should be less than 0.001% (mass fraction) and the nickel content should be less than 0.001% (mass fraction). Copper and nickel content
It is determined by atomic absorption spectrophotometry or other analytical methods with the same accuracy. The sodium iodide content in sodium chloride should not exceed 0.1%
(mass fraction) or total impurities calculated as dry salt should not exceed 0.5% (mass fraction).
Note. If the pH of the solution prepared at 25 °C ± 2 °C exceeds the range of 6.0 to 7.0, the salt or water should be tested for unwanted impurities.
3.2 Adjust pH
3.2.1 pH of the salt solution
The salt solution is adjusted to the specified pH based on the pH of the collected spray solution.
3.2.2 Neutral salt spray test (NSS test)
The pH of the test solution (3.1) should be adjusted so that the pH of the spray solution collected in the salt spray box (4.2) is between 6.5 and 7.2. pH
The value should be measured with a pH meter at 25 °C ± 2 °C, or with a precision pH test paper with a measurement accuracy of not more than 0.3.
When it is out of range, it can be adjusted by adding analytically pure hydrochloric acid, sodium hydroxide or sodium hydrogencarbonate.
Loss of carbon dioxide in the solution during spraying can cause a change in pH. Measures should be taken, for example, to heat the solution over
At 35 ° C, the instrument is fed into the instrument or the solution is prepared from new boiling water to reduce the carbon dioxide content of the solution to avoid pH changes.
3.2.3 Acetate spray test (AASS test)
Add an appropriate amount of glacial acetic acid to the salt solution prepared in 3.1 to ensure that the pH of the collected solution in the salt spray tank (see 4.2) is 3.1~
3.3. If the pH of the initially prepared solution is 3.0~3.1, the pH of the collected solution is generally in the range of 3.1~3.3. pH measurement should be
It can be measured by a pH meter at 25 °C ± 2 °C, and can also be used for daily inspection with precision pH test paper with a measurement accuracy of not more than 0.1. pH of the solution
The value can be adjusted with glacial acetic acid or sodium hydroxide.
3.2.4 Copper accelerated acetate spray test (CASS test)
In the salt solution prepared according to 3.1, copper chloride (CuCl2 · 2H2O) is added at a concentration of 0.26 g/L ± 0.02 g/L (ie
0.205 g/L ± 0.015 g/L of anhydrous copper chloride). The pH adjustment method of the solution is the same as in 3.2.3.
3.3 Filtering
The solution is filtered prior to use to avoid solids in the solution clogging the nozzle.
4 test equipment
4.1 Equipment materials
The materials used to make the test equipment must be resistant to salt spray corrosion and do not affect the test results.
4.2 Salt spray box
The volume of the salt spray box should be not less than 0.4 m3, because it is difficult to ensure the uniformity of the spray with a small volume. For large volume cabinets,
Make sure that the salt spray is evenly distributed during the salt spray test. The top of the tank should be kept from dropping onto the specimen during the test.
The shape and size of the salt spray box should be such that the collection rate of the solution in the tank meets the requirements of 8.3.
Based on environmental considerations, it is recommended that the equipment dispose of the waste liquid in an appropriate manner.
Note. See Appendix A for a brief description of the salt spray box design.
4.3 Temperature control device
The heating system should keep the temperature inside the box to 8.1. The temperature measurement area should be no less than 100mm from the inner wall of the box.
4.4 Spray device
The spray device consists of a compressed air supply, a brine tank and one or more sprayers.
The compressed air supplied to the sprayer should pass through the filter to remove oily and solid particles. Spray pressure should be controlled at 70kPa1)~
Within the range of 170 kPa.
1) 1 kPa = 1 kN/m2 = 0.01 atm = 0.01 bar = 0.145 psi.
Note. There may be a “critical pressure” in the atomizing nozzle where the corrosive nature of the salt spray may be abnormal. If the critical pressure of the nozzle cannot be determined, then
By installing a pressure regulating valve, the air pressure fluctuation is controlled within ±0.7 kPa to reduce the possibility of the nozzle operating at "critical pressure".
In order to prevent evaporation of water in the mist, the air should enter a saturated tower containing distilled or deionized water before it enters the sprayer.
It should be higher than the temperature inside the box by 10 °C or more. Adjust spray pressure, saturation tower water temperature and use suitable nozzles to achieve salt spray settling rate and collection in the tank
The concentration of the liquid meets the requirements of 8.3. Table 1 gives the guide values for the saturation column temperature for the salt spray test at different spray pressures. Water level should be adjusted automatically
Section to ensure adequate humidity.
Table 1 Guidance values for hot water temperature in a saturated tower
Spray pressure
kPa
Guideline value of saturated tower water temperature/°C when performing different types of salt spray tests
Neutral Salt Spray Test (NSS)
And acetate spray test (AASS)
Copper accelerated acetate spray test (CASS)
4.5 Salt mist collector
Place at least two salt mist collectors in the box, one close to the nozzle and one away from the nozzle. The collector is made of a funnel shaped like an inert material such as glass
Shape, diameter 100mm, collection area of about 80cm2, the funnel tube is inserted into the container with scale, it is required to collect salt spray instead of
A liquid dropped from a sample or other part.
4.6 Re-use
If the test chamber has been used for AASS or CASS tests, or other solutions other than NSS, it cannot be used directly in the NSS test.
For this type of situation, the salt spray box must be thoroughly cleaned. Re-evaluation shall be carried out in accordance with the method specified in Chapter 5 before being placed in the test.
In particular, ensure that the pH of the collection fluid is within the specified range.
5 Method for evaluating the corrosion performance of salt spray tanks
5.1 General
In order to verify the reproducibility of test results of test equipment or similar equipment in different laboratories, the equipment shall be verified in accordance with the provisions of 5.2~5.4.
Note. In a fixed operation, the appropriate time interval for evaluating the corrosion performance of the salt spray chamber is generally 3 months.
The steel reference sample was used to determine the corrosivity of the test.
As a supplement to the steel reference sample, the high purity zinc reference sample can be tested and the corrosion performance determined in accordance with Appendix B.
5.2 Neutral salt spray test (NSS test)
5.2.1 Reference sample
The reference sample is made of 4 or 6 CR4 grade cold-rolled carbon steel sheets conforming to ISO 3574, and its plate thickness is 1 mm ± 0.2 mm.
It is 150mm × 70mm. The surface should be free of defects, ie no voids, scratches and oxidized colors. Surface roughness Ra = 0.8 μm ± 0.3 μm.
The sample was taken from a cold rolled steel plate or belt.
The reference sample was put into the test immediately after careful cleaning. In addition to the provisions of 6.2 and 6.3, all dust, oil or impact tests should be removed.
Other foreign substances tested.
Use a clean soft brush or ultrasonic cleaning device, thoroughly with a suitable organic solvent (hydrocarbons boiling between 60 ° C and 120 ° C)
Clean the sample. After washing, the sample was rinsed with a new solvent and then dried.
The cleaned sample was weighed and weighed to the nearest ±1 mg, and then the back of the sample was protected with a peelable plastic film. The edge of the sample is also available
Peelable plastic film for protection.
5.2.2 Placement of reference sample
The specimens are placed in the four corners of the box (if they are six specimens, they are placed in six different positions including the four corners),
The protective side is facing upwards and at an angle of 20° ± 5° to the vertical.
The reference sample holder is made or coated with an inert material such as plastic. The lower edge of the reference sample should be at the same level as the upper part of the salt spray collector
A level. The test time was 48h.
Samples that differ from the reference sample during the verification process should not be placed in the test chamber.
5.2.3 Determination of mass loss
Immediately after the end of the test, the reference sample should be taken out, the protective film on the back of the sample should be removed, and the physical and chemical methods specified in ISO 8407 should be used.
Remove corrosion products. Soaking in a 20% (mass fraction) analytical grade of diammonium citrate (NH4)2HC6H5O7) aqueous solution at 23 °C
10min. After soaking, the sample was washed with water at room temperature, washed with ethanol, dried and weighed.
The sample was weighed to the nearest ±1 mg. By calculating the exposed area of the reference sample, the mass loss per unit area is obtained.
It is recommended to prepare a new solution each time the corrosion product is removed.
Note. 50% (volume fraction) hydrochloric acid solution (ρ20=1.18g/mL) can be added according to ISO 8407, and 3.5g/L hexamethylene group is added.
Tetraamine corrosion inhibitor, soak the sample to remove corrosion products, then wash the sample with water at room temperature, then wash with ethanol, dry and weigh.
5.2.4 Operational inspection of neutral salt spray device
After 48h test, the mass loss of each reference sample is within the range of 70g/m2±20g/m2, indicating that the equipment is operating normally (see reference).
Document 21).
5.3 Acetate spray test (AASS test)
5.3.1 Reference sample
The reference sample is made of four or six CR4 grade cold-rolled carbon steel sheets conforming to ISO 3574, and its plate thickness is 1 mm ± 0.2 mm.
It is 150mm × 70mm. The surface should be free of defects, ie no voids, scratches and oxidized colors. Surface roughness Ra = 0.8 μm ± 0.3 μm.
The sample was taken from a cold rolled steel plate or belt.
The reference sample was put into the test immediately after careful cleaning. In addition to the provisions of 6.2 and 6.3, all dust, oil or impact tests should be removed.
Other foreign substances tested.
Use a clean soft brush or ultrasonic cleaning device, thoroughly with a suitable organic solvent (hydrocarbons boiling between 60 ° C and 120 ° C)
Clean the sample. After washing, the sample was rinsed with a new solvent and then dried.
The cleaned sample was weighed and weighed to the nearest ±1 mg, and then the back of the sample was protected with a peelable plastic film. The edge of the sample is also available
Peelable plastic film for protection.
5.3.2 Placement of reference sample
The specimens are placed in the four corners of the box (if they are 6 specimens, they are placed in 6 different positions including the four corners),
The protective side is facing upwards and at an angle of 20° ± 5° to the vertical.
The reference sample holder is made or coated with an inert material such as plastic. The lower edge of the reference sample should be at the same level as the upper part of the salt spray collector
A level. The test time is 24h.
Samples that differ from the reference sample during the verification process should not be placed in the test chamber.
5.3.3 Determination of mass loss
Immediately after the end of the test, the reference sample should be taken out, the protective film on the back of the sample should be removed, and the physical and chemical methods specified in ISO 8407 should be used.
Remove corrosion products. Dip in a 20% (mass fraction) analytical grade of diammonium citrate [(NH4)2HC6H5O7)] aqueous solution at 23 °C
Soak for 10min. After soaking, the sample was washed with water at room temperature, washed with ethanol, dried and weighed.
The sample was weighed to the nearest ±1 mg. By calculating the exposed area of the reference sample, the mass loss per unit area is obtained.
It is recommended to prepare a new solution each time the corrosion product is removed.
Note. 50% (volume fraction) hydrochloric acid (ρ20=1.18g/mL) solution can be used according to ISO 8407, and 3.5g/L of six times can be added.
The tetraamine inhibitor is used to soak the sample to remove the corrosion product, and then the sample is washed with water at room temperature, washed with ethanol, dried and weighed.
5.3.4 Operational inspection of the acetate mist device
After 24h test, the mass loss of each reference sample is in the range of 40g/m2±10g/m2, indicating that the equipment is operating normally (see reference).
Literature [21]).
5.4 Copper accelerated acetate spray test (CASS test)
5.4.1 Reference sample
The reference sample is made of 4 or 6 CR4 grade cold-rolled carbon steel sheets conforming to ISO 3574, and its plate thickness is 1 mm ± 0.2 mm.
It is 150mm × 70mm. The surface should be free of defects, ie no voids, scratches and oxidized colors. Surface roughness Ra = 0.8 μm ± 0.3 μm.
The sample was taken from a cold rolled steel plate or belt.
The reference sample was put into the test immediately after careful cleaning. In addition to the provisions of 6.2 and 6.3, all dust, oil or impact tests should be removed.
Other foreign substances tested.
Use a clean soft brush or ultrasonic cleaning device, thoroughly with a suitable organic solvent (hydrocarbons boiling between 60 ° C and 120 ° C)
Clean the sample. After washing, the sample was rinsed with a new solvent and then dried.
The cleaned sample was weighed and weighed to the nearest ±1 mg, and then the back of the sample was protected with a peelable plastic film. The edge of the sample is also available
Peelable plastic film for protection.
5.4.2 Placement of reference specimens
The specimens are placed in the four corners of the box (if they are 6 specimens, they are placed in 6 different positions including the four corners),
The protective side is facing upwards and at an angle of 20° ± 5° to the vertical.
The reference sample holder is made or coated with an inert material such as plastic. The lower edge of the reference sample should be at the same level as the upper part of the salt spray collector
A level. The test time is 24h.
Samples that differ from the reference sample during the verification process should not be placed in the test chamber.
5.4.3 Determination of mass loss
Immediately after the end of the test, the reference sample should be taken out, the protective film on the back of the sample should be removed, and the physical and chemical methods specified in ISO 8407 should be used.
Remove corrosion products. Dip in a 20% (mass fraction) analytical grade of diammonium citrate [(NH4)2HC6H5O7)] aqueous solution at 23 °C
Soak for 10min. After soaking, the sample was washed with water at room temperature, washed with ethanol, dried and weighed.
The sample was weighed to the nearest ±1 mg. By calculating the exposed area of the reference sample, the mass loss per unit area is obtained.
It is recommended to prepare a new solution each time the corrosion product is removed.
Note. 50% (volume fraction) hydrochloric acid solution (ρ20=1.18g/mL) can be added according to ISO 8407, and 3.5g/L hexamethylene group is added.
Tetraamine corrosion inhibitor, soak the sample to remove corrosion products, then wash the sample with water at room temperature, then wash with ethanol, dry and weigh.
5.4.4 Operational verification of copper accelerated acetate spray device
After 24h test, the mass loss of each reference sample is in the range of 55g/m2±15g/m2, indicating that the equipment is operating normally (see reference).
Document 21).
6 sample
6.1 The type, quantity, shape and size of the sample shall be selected according to the relevant standards of the material or product to be tested. If there is no standard, the parties concerned may negotiate
Decide. Unless otherwise specified or agreed, the organic coated test panels used in the test shall conform to the substrate specified in ISO 1514 and shall be approximately the same size.
150mm × 100mm × 1mm. Appendix C describes the preparation of organic coated test panels. Appendix D gives the test of the organic coating test board
Additional information needed.
6.2 If there are no other regulations, the sample should be thoroughly cleaned before the test. The cleaning method depends on the nature of the sample material, the surface of the sample and its contamination.
Cleaning should not use abrasives or solvents that may etch the surface of the specimen.
Care should be taken to avoid recontamination after cleaning the s......
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