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GB/T 38269-2019 English PDF

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GB/T 38269-2019: Corrosion of metals and alloys - Accelerated cyclic corrosion tests with exposure to synthetic ocean water salt-deposition process - Dry and wet conditions at constant absolute humidity
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38269-2019	414	Add to Cart	4 days	Corrosion of metals and alloys - Accelerated cyclic corrosion tests with exposure to synthetic ocean water salt-deposition process - Dry and wet conditions at constant absolute humidity	Valid

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Basic data

Standard ID: GB/T 38269-2019 (GB/T38269-2019)
Description (Translated English): Corrosion of metals and alloys - Accelerated cyclic corrosion tests with exposure to synthetic ocean water salt-deposition process - Dry and wet conditions at constant absolute humidity
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H25
Classification of International Standard: 77.060
Word Count Estimation: 22,228
Date of Issue: 2019-12-10
Date of Implementation: 2020-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 38269-2019: Corrosion of metals and alloys - Accelerated cyclic corrosion tests with exposure to synthetic ocean water salt-deposition process - Dry and wet conditions at constant absolute humidity

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Corrosion of metals and alloys--Accelerated cyclic corrosion tests with exposure to synthetic ocean water salt-deposition process--Dry and wet conditions at constant absolute humidity ICS 77.060 H25 National Standards of People's Republic of China Corrosion of metals and alloys containing artificial seawater deposits Cyclic accelerated corrosion test of process Dry/wet under humidity (ISO 16539..2013, IDT) 2019-12-10 release 2020-07-01 implementation State Administration of Market Supervision Published by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the translation method equivalent to ISO 16539..2013, "Corrosion of metals and alloys, the cycle of salt deposition in artificial seawater Accelerated corrosion test Dry/wet at constant absolute humidity. For documents in China that have a consistent correspondence with the international documents referenced normatively in this standard, see Appendix NA. The following editorial changes have been made to this standard. --- Added informative appendix NA. This standard is proposed by China Iron and Steel Industry Association. This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). This standard was drafted. Institute of Metal Research, Chinese Academy of Sciences, Institute of Information Standards of Metallurgical Industry. The main drafters of this standard. Wang Zhenyao, Liu Yuwei, Hou Jie, Pan Chen, Li Qian, Wang Chuan.

Introduction

With or without a protective metal material, it will be affected by many environmental factors, and its importance depends on the type of metal material and the environmental Different types. Therefore, it is impossible to consider all environmental factors affecting corrosion resistance when designing an accelerated corrosion test in a laboratory. So, real Accelerated laboratory tests are often used to simulate the most important factors that can accelerate the corrosion of metallic materials. The accelerated corrosion test described in this standard is intended to simulate and enhance the environmental impact of metal materials when exposed outdoors. Corrosion is accelerated in salt environments. The two test methods in this standard are faster than traditional accelerated tests [such as the neutral salt spray test (NSS) and The accelerated test of cyclic exposure to salt spray, dry and humid conditions as specified in ISO 14993 has unique advantages, and its advantages are reflected in two All of them can better reproduce the corrosion behavior of metallic materials in the atmospheric environment containing a large amount of sea salt particles. The accelerated corrosion tests that simulate atmospheric corrosion in these environments are expected to include the following. a) Constant Absolute Humidity. In an outdoor environment, the temperature and relative humidity change under the condition that the constant absolute humidity is maintained. Suction of deposited salts Water is an important factor affecting atmospheric corrosion behavior. Similarly, in the dry/wet cycle, the constant absolute humidity is also the temperature and relative The purpose/expected presence of humidity in an actual environment. b) Control of salt deposition. Determine the amount of salt deposited on the surface of the sample according to the corrosive properties of the metal materials used in the atmosphere. by Dilute the concentration of the salt solution or adjust the spraying time to provide the same annual average salt deposition as the actual environment. Therefore, the test methods described in this standard include salt deposition and drying/wetting cycles under constant absolute humidity. The obtained results should not provide more in-depth conclusions on the corrosion resistance of the tested metal materials in various atmospheric environmental conditions. But for research Investigating the performance of materials exposed to salty media similar to the test environment provides useful information. Corrosion of metals and alloys containing artificial seawater deposits Cyclic accelerated corrosion test of process Dry/wet under humidity

1 Scope

This standard specifies two accelerated corrosion test methods, Method A and Method B, for the evaluation of metals and alloys with or without a coating on the surface. Corrosive behavior in the atmospheric environment and specifies the equipment selected. Both tests include salt deposition and drying at constant absolute humidity Dry/wet circulation environment. Method A applies to. metals and their alloys (including corrosion-resistant alloys). Method B works for. --- Metals and their alloys; --- Covered metal and its alloy [including metal cover (cathode or anode), organic coating and conversion film].

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. ISO 4628-1 Evaluation of paint and varnish coatings for ageing. Identification of the number and size of defects and the degree of uniform change in appearance. Part 1. General identification system (Paintsandvarnishes-Evaluationofdegradationofcoatings-Designation ofquantityandsizeofdefects, andofintensityofuniformchangesinappearance-Part 1. Generalin- troductionanddesignationsystem) ISO 4628-2 Evaluation of aging of paint and varnish coatings. Identification of the number and size of defects and the degree of uniform change in appearance. Part 2. Determination of foaming levels (Paintsandvarnishes-Evaluationofdegradationofcoatings-Designation ofquantityandsizeofdefects, andofintensityofuniformchangesinappearance-Part 2. Assessment ofdegreeofblistering) ISO 4628-3 Evaluation of paint and varnish coatings for ageing. Identification of the number and size of defects and the degree of uniform change in appearance. Part 3. Evaluation of rust grades (Paintsandvarnishes-Evaluationofdegradationofcoatings-Designation ofquantityandsizeofdefects, andofintensityofuniformchangesinappearance-Part 3. Assessment ofdegreeofrusting) ISO 4628-4 Evaluation of ageing of paints and varnish coatings Identification of the number and size of defects and the degree of uniform change in appearance Part 4. Evaluation of cracking grades (Paintsandvarnishes-Evaluationofdegradationofcoatings-Designation ofquantityandsizeofdefects, andofintensityofuniformchangesinappearance-Part 4. Assessment ofdegreeofcracking) ISO 4628-5 Evaluation of paint and varnish coatings for ageing. Identification of the number and size of defects and the degree of uniform change in appearance. Part 5. Evaluation of peeling grades (Paintsandvarnishes-Evaluationofdegradationofcoatings-Designation ofquantityandsizeofdefects, andofintensityofuniformchangesinappearance-Part 5. Assessment ofdegreeofflaking) ISO 8407 Corrosion of metals and alloys-Corrosion of metalsandaloys-Re- movalofcorrosionproductsfromcorrosiontestspecimens) ISO 8993 Anodized Aluminum and Aluminum Alloys Evaluation Method for Evaluation of Pitting Corrosion (Anodizingofaluminiumand itsaloys-Ratingsystemfortheevaluationofpittingcorrosion-Chartmethod) ISO 9227 Artificial Corrosion Test Salt Spray Test (Corrosiontestsinartificialatmospheres-Saltspraytests) ISO 10289 Ratings of specimens and test pieces after corrosion testing of metals and other inorganic coatings on metal substrates (Methodsfor corrosiontestingofmetalicandotherinorganiccoatingsonmetalicsubstrates-Ratingoftestspeci- mensandmanufacturedarticlessubjectedtocorrosiontests) ISO 11130..2010 Corrosion of metalsandaloys- Alternateimmersiontestinsaltsolution) ISO 14993 Accelerated tests on corrosion cycles of metals and alloys exposed to salt spray, "dry" and "wet" conditions (Corrosionof metalsandaloys-Acceleratedtestinginvolvingcyclicexposuretosaltmist, "dry" and "wet" conditions) ISO 17872 Guidelines for Scratch Marking of Sheet Metal Coatings for Corrosion Testing of Paints and Varnishes (Paintsandvarnishes-Guidelinesfor theintroductionofscribemarksthroughcoatingsonmetalicpanelsforcorrosiontesting)

3 Test solution

3.1 Preparation of mixed salt solution The composition of the solution is shown in Table 1.Distilled or deionized water with a temperature of 25 ° C ± 2 ° C and an electrical conductivity not exceeding 20 μS/cm should be selected A mixed salt solution with a mass concentration of 36.0 g/L ± 3.6 g/L. The composition of the mixed salt solution is the same as that of seawater in a typical artificial atmosphere, see ISO 11130..2010, A.3 (Simulating the effects of seawater corrosion The solution). Table 1 Composition of mixed salt solution Reagent (analytical grade) Mass concentration/(g/L) NaCl 24.53 MgCl2 5.20 Na2SO4 4.09 CaCl2 1.16 KCl 0.695 NaHCO3 0.201 KBr 0.101 H3BO3 0.027 SrCl2 0.025 NaF 0.003 Warning. The operation of SrCl2 and NaF is highly dangerous and should only be used by or under the supervision of skilled chemists. 3.2 pH adjustment 5.0g ± 0.5g of NaOH was dissolved in water and diluted to a 1L NaOH solution with a concentration of 0.125mol/L. This solution Add to the mixed salt solution to adjust the pH to 8.2 ± 0.1 (temperature 25 ° C ± 2 ° C). 3.3 Preparation of test solution The test solution should be a 10- or 100-fold diluted solution with a mixed salt solution, with a mass concentration of 36.0 g/L ± 3.6 g/L, 3.6g/L ± 0.36g/L, 0.36g/L ± 0.036g/L. If not specified, the mass concentration shall be determined through consultation between the supply and demand sides.

4 Equipment

4.1 Component protection All parts in contact with the test solution shall be made of a solution-resistant material or lined with a corrosion-resistant lining without affecting the atomization test Corrosiveness of the solution. The equipment shall include the components described below. 4.2 Exposure Box The temperature and humidity in the exposure cabinet should be continuously controlled. 4.3 Salt deposition device The atomizer should be made of a corrosion-resistant material, such as glass, plastic or titanium alloy. The atomization test solution shall be uniformly deposited on the surface of the sample, and Controlled deposition amount. The particle size of the atomizing solution does not exceed 100 μm. The amount of deposition of the test solution can be controlled by. a) control the continuous atomization of each test cycle; b) Control the amount of test solution, atomizing pressure and moving speed of the atomizer. The compressed air provided to the atomizer should be filtered by a filter to remove oil and solid impurities. 4.4 Temperature and humidity control device The temperature and humidity control device should be able to detect and control the temperature and humidity around the sample. During the temperature and humidity transition period, the device should control the dry bulb temperature and There is a linear change between the standard value and the test period. The device shall be capable of controlling humidity to maintain absolute values at least to dry bulb temperature per minute Constant humidity, or use other high precision devices. 4.5 Rinse treatment of specimen After the temperature and humidity cycle, the samples were rinsed before the redeposition test. First, the sample is washed with distilled water, and then used. Deionized water cleaning. Then use clean air to carefully remove the water droplets to prevent the corrosion products from falling off. 4.6 Instrument type The following are three types of instruments that meet the requirements specified in 4.1 ~ 4.5. a) Two boxes (automatic program). The specimen moves between the salt deposition box and the exposure box. The atomizer moves back and forth, left and right to change each test The amount of salt deposited on the sample surface. Then, move the sample to the exposure box, perform a drying/wetting cycle, and clean it automatically (see Appendix A). b) Single box type (automatic program). The sample is placed in a box, the atomizer is installed, the drying/wetting cycle is performed, and the sample is automatically cleaned (see (See Appendix B). c) Single box type (manual procedure). After depositing salt on the surface of the sample (see 4.3), manually place the sample in the box for dry/wet cycle ring. Then remove the sample from the box for cleaning. After cleaning, the sample should be placed in the box as soon as possible (see Appendix C).

5 Sample requirements

5.1 The number and type of test specimens shall be selected according to the specifications of the test materials or products. If not specified, it shall be decided through consultation between the supplier and the supplier. 5.2 Samples should be carefully cleaned before the test to remove dirt, oil stains or other impurities, so as not to affect the test results. The cleaning method used should be taken Depending on the nature of the materials and contaminants, abrasives or solvents that should corrode the surface of the specimen should not be selected. 5.3 For metals or alloys without any organic or inorganic coating, a suitable organic solvent should be selected. The sonic cleaning device thoroughly cleans the sample. The cleaning process should be performed in a container filled with solvent. After cleaning, rinse again with clean solvent Blow dry after. 5.4 Unless otherwise specified, samples with protective organic coatings need not be cleaned before testing. If cleaning is necessary, apply alcohol Wipe the sample with gauze to avoid damaging the sample surface. Please note that the samples should not be contaminated after cleaning. 5.5 If the sample is cut from a covered sample, the damaged area of the cover should be avoided. Unless otherwise specified, the edges of A covering that is stable during the test is protected. Such as paint, wax or tape.

6 Measurement method of salt deposition

The test solution is deposited on the surface of the sample. The average value of salt deposition should be determined by measuring the change in sample mass before and after salt deposition. To 1mg. To prevent the sample from drying, the measurement process should be completed as soon as possible.

7 Sample preparation

After the salt on the surface of the sample is deposited, it is placed in the cabinet. Avoid contact between the sample and the cabinet when placing. The specimen should be placed horizontally. As long as the droplets do n’t The sample is dropped on the surface of the sample or the sample is not placed directly under other samples. The sample in the box can be placed on a different plane.

8 Operating conditions and procedures

The operating conditions are shown in Table 2 (Method A) and Table 3 (Method B). The operation process is shown in Figure 1 (Method A) and Figure 2 (Method B). Test sink The salt solution should not be reused. During the test, the pressure in the box should be maintained at atmospheric pressure. Table 2 Test conditions for method A Process conditions a) Salt deposition 1) Temperature 2) Test solution 3) frequency 4) Salt deposition 1) Room temperature 2) See Chapter 3 3) After each cycle 4) The deposition amount of salt solution on the test surface should be 250g/m2 ± 50g/m2. Solution concentration is not lower than human 1/1000 of seawater concentration b) "Dry" ambient temperature and relative humidity 1) A (49 ± 1) ℃ (32 ± 5)% 2) B (54 ± 1) ℃ (25 ± 5)% 3) C (55 ± 1) ℃ (24 ± 5)% 4) D (54 ± 1) ℃ (25 ± 5)% 5) E (49 ± 1) ℃ (32 ± 5)% c) "Wet" environment (30 ± 1) ℃ (90 ± 5)% d) Washing with clean distilled water (not exceeding 40 ° C) Table 2 (continued) Process conditions e) the length and composition of an exposure cycle (a (The exposure period is 24h) "Wet" 6h36min "Dry" 10h48min "Wet" 6h36min f) those that meet the specified conditions during an exposure cycle time "Wet" to "Dry (A)" 2h22min "Dry (A)" to "Dry (B)" 1h40min "Dry (B)" to "Dry (C)" 1h22min "Dry (C)" to "Dry (D)" 1h22min "Dry (D)" to "Dry (E)" 1h40min "Dry (E)" to "Wet" 2h22min Note 1. The temperature and humidity should change linearly within the specified time interval [see f) in this table. Continuous drying processes A to E give the same absolute humidity, Dew point temperature of 30 ° C. Note 2. Under equilibrium conditions, the tolerances on the given parameter values --- temperature and relative humidity are allowed to fluctuate. This does not mean that the value can be given at random Changes in the total value of the set value. Explanation. T --- temperature, ℃; s --- salt deposition; R --- relative humidity,% RH; r --- cleaning treatment. t --- time, h; Figure 1 Test process for method A Table 3 Test conditions for method B Process conditions a) Salt deposition 1) Temperature 2) Test solution 3) frequency 4) Salt deposition 1) Room temperature 2) See Chapter 3 3) After 8 cycles and 11 cycles 4) The deposition amount of salt solution on the test surface shall be 28.0g/m2 ± 2.8g/m2. Solution concentration is not lower than 1/1000 of artificial seawater concentration b) "dry" environment Temperature and relative humidity (60 ± 1) ℃ (35 ± 5)% c) "Wet" environment (40 ± 1) ℃ (95 ± 5)% d) Washing with clean distilled water (not exceeding 40 ° C) e) the length and composition of an exposure cycle (a (The exposure period is 24h) "Dry" 3h "Wet" 3h Until the specified conditions are met "Dry" to "Wet" for 1h "Wet" to "Dry" for 1h f) Test process 1) Salt deposition 2) Dry/wet cycle. 8 cycles After the end of the cycle, when the temperature reaches 60 ° C, the sample should be quickly removed from the box. 3) Cleaning treatment 4) Salt deposition The cleaning process and salt deposition process should be completed under dry conditions. 5) Dry/wet cycle. 11 cycles After the end of the cycle, when the temperature reaches 60 ° C, the sample should be quickly removed from the box. 6) Cleaning treatment Note 1. Dew point temperature is 39 ℃, temperature and humidity should be changed under the same absolute humidity. Note 2. Under equilibrium conditions, the tolerances on the given parameter values --- temperature and relative humidity are allowed to fluctuate. This does not mean that the value can be given at random Changes in the total value of the set value. Explanation. T --- temperature, ℃; s --- salt deposition; R --- relative humidity,% RH; r --- cleaning treatment. C --- cycle; Figure 2 Test process for method B

9 Sample treatment after test

After the test, remove the sample from the box and dry it for 0.5h ~ 1h before rinsing to prevent the corrosion products from falling off. Before the sample is tested, The sample was gently rinsed in clean tap water at a temperature not exceeding 40 ° C to remove the salt solution remaining on the surface of the sample, and then immediately used not more than Dry with.200kPa compressed air. 10 Test continuity It is best to maintain continuity throughout the test. If you need to interrupt the operation, try to minimize the interruption time. When it is necessary to interrupt the test, the sample......

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