GB/T 10125-2021 (GB/T10125-2021, GBT 10125-2021, GBT10125-2021) & related versions
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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.
......
| 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 |
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