Standard number: GB/T 10125-2012
Standard name: Artificial atmosphere corrosion test salt spray test
English name: Corrosion tests in artificial atmospheres-salt spray tests ||
tt||Standard format: PDF
Published time: 2012-12-31
Implementation time: 2013-10-01
Standard size: 875K
Standard introduction: This standard specifies the equipment, reagents and methods used in neutral salt spray (NSS), acetic acid salt spray (AASS) and copper accelerated acetic acid salt spray (CASS) tests.
This standard is applicable to the evaluation of the corrosion resistance of metal materials and coatings. The tested objects can be permanent or temporary corrosion protection or non-permanent or temporary corrosion protection. This
standard also specifies the method for evaluating the corrosiveness of the test chamber environment.
This standard does not specify the specimen size, test cycle and result interpretation of special products. For these contents, please refer to the corresponding product specifications.
This test is applicable to the detection of discontinuities such as pores and other defects in metals and their alloys, metal coatings, organic coatings, anodic oxide films and conversion films.
Neutral salt spray test is applicable to:
---Metals and their alloys;
---Metal coatings (anodic or cathodic);
---Conversion film
---Anodic oxide film;
---Organic coatings on metal substrates
This standard specifies the equipment, reagents and methods used in neutral salt spray (NSS), acetic acid salt spray (AASS) and copper accelerated acetic acid salt spray (CASS) tests. This standard is applicable to the evaluation of the corrosion resistance of metal materials and coatings. The tested objects can be permanent or temporary corrosion protection or non-permanent or temporary corrosion protection. This standard also specifies the method for evaluating the corrosiveness of the test chamber environment. This standard does not specify the specimen size, test cycle and interpretation of results for special products. For these contents, please refer to the corresponding product specifications. This test is applicable to the detection of discontinuities such as pores and other defects in metals and their alloys, metal coatings, organic coatings, anodic oxide films and conversion films. Neutral salt spray test is applicable to: ———Metals and their alloys; ———Metal coatings (anodic or cathodic); ———Conversion coatings; ———Anodic oxide films; ———Organic coatings on metal substrates. Acetic acid salt spray test is applicable to copper + nickel + chromium or nickel + chromium decorative coatings, and also to aluminum anodic oxide films. Copper accelerated acetic acid salt spray test is applicable to copper + nickel + chromium or nickel + chromium decorative coatings, and also to aluminum anodic oxide films. This test is applicable to the performance comparison of metal materials with or without corrosion protection, and is not applicable to the ranking of corrosion resistance of different materials.
This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard replaces GB/T 10125-1997 "Artificial atmosphere corrosion test salt spray test". Compared with GB/T 10125-1997, the main
changes are as follows:
———Introduction is added;
———Scope of application is added (see Chapter 1);
———Normative references are readjusted;
———Concentration of sodium chloride solution is modified, and the method for adjusting the pH value of the solution is specified in more detail (see Chapter 3);
———The volume of the salt spray chamber is modified to be not less than 0.4m3 (see 4.2);
———The requirements for salt spray equipment are supplemented (see 4.4);
———Specific requirements for reuse are added (see 4.6);
———Added the provisions on the corrosion performance test method of AASS test, comprehensively revised the corrosion performance test method of CASS test,
and partially revised the basic requirements for specimens of the corrosion performance test method of NSS test. Pretreatment, test time and post-test
treatment (see Chapter 5);
———Added requirements for test panels with organic coatings (see Chapter 6);
———Modified the placement of test specimens (see Chapter 7);
———Added new requirements for test conditions (see Chapter 8);
———Added methods for post-test sample treatment (see Chapter 10);
———Added evaluation methods for organic coatings (see Chapter 11);
———Added requirements for test reports (see Chapter 12);
———Modified the design diagram of the salt spray chamber (see Appendix A);
———Added a supplementary method for evaluating the corrosion performance of the salt spray chamber using a zinc reference specimen (see Appendix B);
———Added test panels for organic coatings (see Appendix C);
———Added additional information for test panels for organic coatings (see Appendix D);
———Added supplementary information on the steel reference sample grade (see Appendix E).
This standard adopts ISO9227:2006 "Artificial atmosphere corrosion test salt spray test" by translation method.
For Chinese documents that have a consistent correspondence with the international documents normatively referenced in this standard, see Appendix NA.
This standard has made the following editorial changes:
———Canceled the ISO9227:2006 foreword and added the foreword of this standard.
———Replaced "this international standard" with "this standard".
———Added informative Appendix NA, Chinese documents that have a consistent correspondence with the international documents normatively referenced in this standard.
This standard is proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coverings (SAC/TC57).
This standard was drafted by: Wuhan Institute of Materials Protection, Tongxiang Tiesheng Line Equipment Co., Ltd., Ningbo High-tech Zone Yuanchuang Technology Co., Ltd., Wuhan University, Wuhan Caibao New Materials Co., Ltd., Ma'anshan Dingtai Rare Earth Technology Co., Ltd.
The main drafters of this standard are: Zhang Yan, Jiang Lei, Liu Shuo, Shi Zhimin, Liu Jilu, Shen Hongwei, He Yingchun, Li Xinli, Li Anzhong, Chu Qifeng, Ding Weijun, Xie Fan, Zhang Qiang, Li Zhi. The
previous versions of the standards replaced by this standard are:
GB/T10125—1997.
The following documents are indispensable for the application of this document. For all dated referenced documents, only the dated version applies to this document. For all undated referenced documents, the latest version (including all amendments) applies to this document.
ISO1514:2004 Paints and varnishes Standard panels for testing
ISO2808:2007 Paints and varnishes Determination of film thickness
ISO3574:1999 Cold-reduced carbon steel sheet of commercial and drawing qualities
ISO8407:2009 Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens

ISO17872:2007 Paints and varnishes
Guidelines for the introduction of scribe marks through coating on metallic panels for corrosion testing
Foreword III
Introduction IV
1 Scope1
2 Normative references1
3 Test solution2
3.1 Preparation of sodium chloride solution2
3.2 Adjustment of pH value2
3.3 Filtration2
4 Test equipment2
4.1 Equipment and materials2
4.2 Salt spray chamber3
4.3 Temperature control device3
4.4 Spray device3
4.5 Salt spray collector3
4.6 Re-use3
5 Methods for evaluating the corrosion performance of salt spray chamber4
5.1 General4
5.2 Neutral salt spray test (NSS test) 4
5.3 Acetic acid salt spray test (AASS test) 5
5.4 Copper accelerated acetic acid salt spray test (CASS test) 5
6 Specimen6
7 Specimen placement6
8 Test conditions7
9 Test cycle7
10 Treatment of specimens after the test7 11
Evaluation of test results8
12 Test report8
Appendix A (Informative Appendix) Schematic diagram of salt spray chamber design9
Appendix B (Informative Appendix) Supplementary method for evaluating the corrosion resistance of salt spray cabinet using zinc reference specimen11
Appendix C (normative appendix) Test specimens for organic coatings13
Appendix D (normative appendix) Supplementary information for test specimens
for organic coatings14 Appendix E (informative appendix) Supplementary information on the grade of steel reference specimens15
Appendix NA (informative appendix) Chinese documents that have a consistent correspondence with the international documents normatively referenced in this standard16 References17

Figure A.1 Schematic diagram of the design of the salt spray cabinetFront view9
Figure A.2 Schematic diagram of the design of the salt spray cabinetSide view10
Table 1 Guidance values ​​for the temperature of hot water in the saturated tower3
Table 2 Test conditions7
Table B.1 When verifying the corrosion performance of the salt spray chamber, the allowable range of mass loss of the zinc reference sample and the steel reference sample 12
Table E.1 Comparison table of similar steel reference sample grades of this standard and domestic and foreign standard grades 15

IS 25. 220. 40
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National Standard of the People's Republic of China
GB/T 10125--2012/IS0 9227;2006Replaces GB/T101251997
Artificial atmosphere corrosion test
Salt spray test
Corrosion tests in artificial atmospheres-Salt spray tests(ISO 9227.2006,IDT)
2012-12-31Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of China
2013-10-01Implementation
National Standard of the People's Republic of China
Artificial atmosphere corrosion test
Interception test
GB/T 10125—2012/1SO 9227:2006*
Published and distributed by China Standard Publishing House
No. 2, Hepingli West Street, Chaoyang District, Beijing (100013) No. 16, Sanlihe North Street, Xicheng District, Beijing (100045)iiikAa~cJouakAa
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Printed by China Standard Publishing House Qinhuangdao Printing and Cutting FactoryDistributed by Xinhua Bookstores in various regions
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Report telephone number: (010) 68510107
1 Scope
2 Normative references
3 Test solution
3.1 Preparation of sodium chloride solution
3. 2 Adjustment of pH Value
3.3 Filtration
4 Test equipment
Equipment and materials
Salt spray chamber
Temperature control device
4.4 Spray device
4.5 Salt spray collector
Re-use
5 Method for evaluating the corrosion performance of salt spray chamber
Neutral salt spray test (NSS Test)
Acetic acid salt spray test (AASS test)
Accelerated acetic acid salt spray test (CASS test) for steel 6 Specimen
Specimen placement
Test conditions
Test cycle
Treatment of specimens after the test
11 Evaluation of test results
12 Test report.
Appendix A (Informative Appendix) Simple design drawing of salt spray chamber
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GB/T 10125—2012/IS0 9227:20Q6 Appendix 1 (Informative Appendix) Supplementary method for evaluating salt box corrosion using zinc reference specimens Appendix C (Normative Appendix) Test specimens for organic coatings Appendix D (Normative Appendix) Information required for test specimens for organic coatings Appendix E (Informative Appendix)
Supplementary information on steel reference specimen grades Appendix NA (Informative Appendix) Chinese reference documents that have a consistent correspondence with the international documents referenced in this standard
GB/T10125—2012/IS0 9227:2006 Figure A.1 Design diagram of salt spray chamber
Front view
Figure A, 2 Design diagram of salt spray chamber Side view
Table 1 Guidance value of hot water temperature in saturated tower
Table 2 Test conditions
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Table B.1 Allowable range of mass loss of zinc reference sample and steel reference sample when verifying the corrosion performance of salt spray chamber Table E.1 Similar comparison between the steel reference sample grades of this standard and domestic and foreign standard grades Table I
This standard was drafted according to the rules given in CB/T 1.1-2009. iiiKAa~cJouaKAa
GB/T 10125-2012/ISO 9227.2006 Salt Spray Test", compared with GB/T101251997 Artificial Atmosphere Corrosion Test (1997), this standard replaces GB/T101251997. The main changes are as follows: an introduction is added; the applicable scope is added (see Chapter 1); the normative references are readjusted; the concentration of sodium chloride solution is modified, and the adjustment method of the pH value of the solution is more detailed (see Chapter 3); the volume of the salt spray chamber is modified to be not less than 0.4m3 (see 4.2); the requirements for the old fog device are supplemented (see 4.4); the specific requirements for reuse are added (see 4.6); -· Added the provisions for the corrosion performance test method of AASS test, comprehensively revised the corrosion performance test method of CASS test, and partially revised the basic requirements for specimens of the corrosion performance test method of NSS test. Pretreatment, test time and post-test treatment (see Chapter 6)
一-· Added requirements for test panels with peach coating (see Chapter 6): .. Modified the placement of samples (see Chapter 7) 1- Added new requirements for test conditions (see Chapter 8); Added methods for sample treatment after the test (see Chapter 10); 一- Added evaluation methods for organic layers (see Chapter 11); Added requirements for test reports (see Chapter 12); ... - Modified the design diagram of the salt spray chamber (see Appendix A) Added a supplementary method for evaluating the corrosion performance of the salt spray chamber using zinc reference samples (see Appendix B); Added test panels for organic coatings (see Appendix C); Added additional information for test panels for organic coatings (see Appendix D); Added additional information on the steel reference sample grade (see Appendix E). This standard adopts the translation method, which is equivalent to the IS09227:2006 artificial atmosphere corrosion test salt penetration test. See Appendix NA for Chinese documents that have a consistent correspondence with the international documents normatively referenced in this standard. This standard has been edited as follows:
The foreword of ISO 9227:2006 has been deleted, and the foreword of this standard has been added. "This standard" has been replaced with "this international standard". An informative appendix NA has been added, which contains Chinese documents that have a consistent correspondence with the international documents normatively referenced in this standard. This standard was proposed by the China Machinery Industry Federation. This standard was approved by the National Technical Committee for Standardization of Metallic and Non-metallic Coatings (SAC/TC57). The drafting organizations of this standard are: Wuhan Institute of Material Protection, Ma'anshan Dingtai Rare Earth Technology Co., Ltd., Tongxiang Tiesheng Line Equipment Co., Ltd., Ningbo High-tech Zone Yuanchuang Technology Co., Ltd., Wuhan Material Protection New Materials Co., Ltd., and Wuhan University. The main drafters of this standard are: Zhang Yan, Jiang Lei, Liu Shuo, Shi Zhimin, Liu Jilu, Shen Hongwei, He Yingchun, Li Xinli, Li Anzhong, Chu Qifeng, Ding Weijun, Xie Fan, Zhang Qiang, Li Zhi
The previous version of the standard replaced by this standard is GB/T 10125-1997.
GB/T 10125--2012/IS0 9227:2006
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Since there are many factors affecting metal corrosion, a single salt spray resistance cannot replace the resistance to other media. Therefore, the test results obtained by this standard cannot be used as a direct guide to the corrosion resistance of the test materials in all use environments. At the same time, the performance of various materials in the test cannot be used as a direct guide to the corrosion resistance of these materials in use. Therefore, the method specified in this standard can only be used as a method to test whether the test materials have or not anti-corrosion properties. Salt spray test can be used as a test method to quickly evaluate the discontinuity, pores and damage of organic and inorganic coatings, and can also be used to compare the process quality of samples with similar coatings. It is unreliable to draw long-term corrosion behaviors of different coating systems from the comparison results of salt spray test, because the corrosion resistance of these coating systems in actual environment is obviously different from that in salt cluster test. 1 Range
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GB/T 10125—2012/IS0 9227:2006 Artificial atmosphere corrosion test Salt spray test
This standard specifies the equipment, reagents and methods used in neutral salt spray (NSS), acetic acid salt spray (AASS) and copper accelerated acetic acid salt spray (CASS) tests.
This standard is applicable to the evaluation of the corrosion resistance of metal materials and coatings. The test objects can be permanent or temporary corrosion protection, or non-permanent or temporary corrosion protection. This standard also specifies the method for evaluating the corrosion resistance of the test chamber environment. This standard does not specify the test size, test cycle and result interpretation of special products. For these contents, please refer to the corresponding product specifications. This test is applicable to the detection of discontinuities such as pores and other defects in metals and base alloys, metal layers, organic coatings, anodic oxide films and conversion films.
Neutral salt spray test is applicable to:
--Metals and their alloys;
Metal thin coatings (anodic or cathodic); -Conversion film:
--Anodic oxide film;
Organic coatings on metal substrates.
The acetate test is applicable to copper + nickel + chromium or nickel + chromium decorative coatings, and is also applicable to aluminum anodized films. The copper accelerated acetate salt spray test is applicable to copper + nickel + chromium or nickel + chromium decorative coatings, and is also applicable to aluminum anodized films. This test is applicable to the performance comparison of metal materials with or without corrosion protection, and is not applicable to the ranking of different materials in terms of corrosion resistance.
2 Normative references
The following documents are indispensable for the application of this document. For all dated references, only the dated version applies to this document. For all undated references, the latest version (including all amendments) applies to this document. ISQ1514:2004 Paints and varnishes Standard panels far testing IS0 2808;2007 Paints and varnishes Determination of film thickness ISO3574:1999 Cold-reduced carbon steel sheets for commercial and drawing grades ISO8407:2009 Corrosion of metals and Alloys Removal of corrasion products from corrosion test specimens ISO17872:2007 Paints and varnishes Guidelines for the introduction of scribe marks through coatings on metalic panels for corrosion testing GB/T10125—2012/S09227:2006 3 Test solution 3.1 Preparation of sodium chloride solution The reagents used in this test are chemically pure or higher. Sodium chloride dissolved in distilled water or deionized water with a conductivity of no more than 20μS/cm at a temperature of 25℃±2℃ is prepared to a concentration of 50g/L±5g/L: the collected spray liquid concentration should be 50/L±5/L. At 25℃, the density of the prepared braid liquid is in the range of 1.029 to 1.036. The copper content in sodium chloride should be less than 0.001% (mass fraction). The content of copper and nickel is determined by atomic absorption spectrophotometry or other analytical methods with equal accuracy. The content of sodium iodide in sodium chloride should not exceed 0.1% (mass fraction) or the total impurities calculated on the basis of dry salt should not exceed 0.5% (mass fraction). Note: If the pH value of the solution prepared at 25°C ± 2°C exceeds the range of 6.0-7.0, the salt or water should be tested for unwanted impurities. 3.2 Adjustment of pH value
3.2.1 pH value of salt solution
Adjust the salt solution to the specified pH value based on the pH value of the collected spray solution. 3.2.2 Neutral Salt Test (NSS Test) bZxz.net
The pH value of the test solution (3.1) should be adjusted to the pH value of the spray solution collected in the salt spray chamber (.2) between 6.5 and 7.0. The pH value should be measured at 25°C ± 2°C using an acidometer, or with a measurement accuracy of no more than 0. 3.3 precision pH test paper for regular testing. When it exceeds the range, analytical pure hydrochloric acid, sodium hydroxide or sodium bicarbonate can be added to adjust it. The loss of carbon dioxide in the solution during spraying may cause pH changes. Corresponding measures should be taken, for example, heating the solution to more than 35℃ before sending it to the instrument or preparing the solution with new boiling water to reduce the content of carbon dioxide in the solution, which can avoid pH changes. 3.2.3 Acetate solution test (AASS test) Add appropriate amount of glacial acid to the salt solution prepared according to 3.1 to ensure that the pH value of the collected solution in the salt tank (see 4.2) is 3.1~3.3. If the pH value of the initial preparation is 3.0-~3.1, the pH value of the collected solution is always within the range of 3.1~~3.3. The pH value is measured at 25℃±2℃ using an acidometer or a precision pH meter with a measurement accuracy of no more than 0.1. Test paper is not used for routine testing. The pH value of the solution can be adjusted with glacial acetic acid or sodium hydroxide. 3.2.4 Copper accelerated acetate salt test (CASS test) In the salt solution prepared according to 3.1, add slaked copper (CaCl2H2O) at a concentration of 0.26 g/L ± 0.02 g/L (i.e. 0.205 g/L ± 0.015 g/L anhydrous copper chloride). The pH value of the solution is adjusted in the same way as in 3.2.3. 3.3 Filter the solution before use to prevent solid matter in the solution from 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 not affect the test results. 4.2 Salt spray chamber GB/T 10125—2012/1SO 9227:2006 The volume of the salt spray chamber should not be less than 0.4m", because it is difficult to ensure the uniformity of the spray with a smaller volume. For large-volume chambers, it is necessary to ensure that the salt spray is evenly distributed during the salt spray test. The chamber should avoid the accumulated solution dripping onto the specimen during the test. The shape and size of the salt spray should be able to make the collection rate of the excess liquid in the chamber meet the requirements of 8.3. Based on environmental protection considerations, it is recommended that the equipment adopt an appropriate method to dispose of waste liquid. Note: For the design drawing of the salt spray chamber, see Appendix A. 4.3 Temperature control device
The heating system should maintain the temperature in the chamber to the requirements of 8.1. The temperature measurement area should be at least 100 away from the inner wall of the chamber. mm. 4.4 Spraying device
The spraying device consists of a compressed air supply, a salt water tank and one or more sprayers. The compressed air supplied to the sprayer should pass through a filter to remove oil and solid particles. The spray pressure should be controlled within the range of 70kPa to 170kPa.
Note: There may be a "critical pressure" in the atomizing nozzle, at which the corrosiveness of the salt may be abnormal. If the critical pressure of the nozzle cannot be determined, the air pressure fluctuation should be controlled within the range of ±0.7kPa by installing a pressure regulating valve to reduce the possibility of the nozzle operating under the "critical pressure". To prevent water from being dispersed in the droplets, the air should enter a mixing tank filled with distilled water or deionized water before entering the sprayer, and its temperature should be more than 10℃ higher than the temperature in the box. Adjust the spray pressure, saturated water temperature and use a suitable nozzle so that the salt spray rate in the box and the concentration of the collected liquid meet the requirements of 8.3. Table 1 gives the guidance values ​​of the saturated overflow of the salt spray test at different spray pressures. The water level should be automatically adjusted to ensure sufficient humidity.
Table 1 Guideline values ​​for hot water temperature in saturated tower
Guideline values ​​for saturated tower water temperature when conducting different types of salt spray tests/spray pressure
4.5 Salt spray collector
Neutral salt spray test (NSS)
And Ambient Salt Spray Test (AASS)
Copper Ground Salt Spray Test (CASS)
At least two salt spray collectors should be placed in the box, one close to the nozzle and one away from the nozzle. The collector is made of inert materials such as glass in the shape of a funnel with a diameter of 100 mm.The collection area is about 80 cm2. The funnel is inserted into a container with scales. It is required to collect salt spray, not liquid dripping from the sample or other parts.
4.6 Re-use
If the test chamber has been used for AASS or CASS test, or other solutions different from NSS, it cannot be directly used for NSS test. 1) 1kPa1kN/ma=0.01atm-0.01bar=0.145psi. GB/T 10125—2012/IS0 9227:2006iiiKAa~cJouaKAa
For such cases, the salt spray chamber must be cleaned and disinfected. Before placing the sample in the test, it should be re-evaluated according to the method specified in Chapter 5, especially to ensure that the collected pH value is within the specified range. 5 Methods for evaluating salt spray corrosion performance
5.1 General
In order to verify the reproducibility of the test equipment or the test results of similar equipment in different laboratories, the equipment should be verified according to the provisions of 5.2~~5.4. Note: In fixed operation, the appropriate time for evaluating the corrosion performance of the salt spray box is generally 3 months, and the corrosion performance of the test is determined by a steel reference sample. As a supplement to the steel reference sample, a high-purity zinc reference sample can be tested and the corrosion performance is determined by referring to the provisions of Appendix B. 5.2 Neutral Salt Spray Test (NSS Test)
5.2.1 Reference Sample
The reference sample uses 4 or 6 CR4 grade cold-rolled carbon steel plates that meet ISO3574, with a plate thickness of 1mm + 0.2mm and a sample size of 150mm×70mm. The surface should be free of defects, i.e., no pores, scratches and oxidation color. Surface roughness Ra=0.8μm±0.3μm. Take the specimen from the cold-rolled steel sheet or strip.
The reference specimen shall be put into the test immediately after careful cleaning. In addition to the provisions of 6.2 and 6.3, all dust, oil or other foreign matter that may affect the test results shall be removed.
The specimen shall be thoroughly cleaned with a clean soft brush or ultrasonic cleaning device with an appropriate organic solvent (carbon oxide with a boiling point between 60℃ and 120℃). After cleaning, rinse the specimen with a new solvent and then dry it. The cleaned specimen shall be weighed to the nearest ±1 liter and then protected with a peelable plastic film on the back of the specimen. The edges of the specimens can also be protected with a peelable plastic film.
5.2.2 Placement of reference specimens
The specimens are placed at the four corners of the chamber (if there are six specimens, they are placed at different positions including the four corners), with the unprotected side facing and at an angle of 20 ± 5 to the square. The reference specimen holder is made of inert material (such as plastic or coated). The lower edge of the reference specimen should be at the same level as the upper part of the salt spray collector. The test time is 48 h.
Samples different from the reference specimens should not be placed in the test chamber during the verification process. 5.2.3 Determination of mass loss
After the test, the reference specimen should be taken out immediately, the protective film on the back of the specimen should be removed, and the corrosion products should be removed according to the physical and chemical methods specified in ISO8407. Soak in 20% (mass fraction) analytical grade diammonium citrate (NH4Cl4) aqueous solution at 23°C for 10 min. After soaking, wash the specimen with water at room temperature, then with ethanol, and weigh it after drying. The sample is weighed accurately to ±1 mg. The mass loss per unit area is obtained by calculating the exposed area of ​​the reference sample. A new solution is prepared each time the corrosion products are removed. Note: According to the provisions of ISO 8407, a 50% (volume fraction) hydrochloric acid solution (p=1.18 g/mL) is added with 3.5 g/L hexamethylenetetramine corrosion inhibitor to soak the sample to remove the corrosion products. After heating, the sample is filled with water at room temperature, and then washed with ethanol. After drying, it is weighed. 5.2.4 Operation test of neutral salt spray device
After 48h test, the mass loss of each reference sample is within the range of 70g/m3 ±20g/m3, indicating that the equipment is operating normally (see reference 21).
5.3 Acetic acid salt spray test (AASS test)
5.3.1 Reference sample
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GB/T 10125--2012/ISO 9227:2006 The reference sample is four or six CR4 grade cold-rolled carbon steel plates that meet ISO3574, with a plate thickness of 1mm±0.2mm and a sample size of 150mm×70mm. The surface should be free of defects, i.e., no holes, scratches or oxidized color. The surface roughness Ra=0.8μm±0.3μm is cut from the cold-rolled steel plate or strip.
The reference sample is carefully cleaned and immediately put into the test. In addition to the provisions of 6.2 and 6.3, all dust, oil or other foreign matter that may affect the test results should be removed.
Use a soft brush or ultrasonic cleaning device to thoroughly clean the sample with an appropriate organic solvent (hydrocarbon with a boiling point between 60℃ and 120℃). After cleaning, rinse the sample with a new cleaning agent and then dry it. After cleaning, blow dry the sample and weigh it to an accuracy of ±1ng, then protect the back of the sample with a peelable plastic film. The edge of the sample can also be protected with a peelable plastic film.
5.3.2 Placement of reference specimens
The specimens are placed at the four corners of the chamber (if there are 6 specimens, they are placed at 6 different positions including the four corners), with the unprotected side facing up and at an angle of 20" + 5\ to the vertical. The reference specimen holder is made of or coated with a flexible material (such as plastic). The lower edge of the reference specimen should be at the same level as the upper part of the salt spray collector. The test time is 24 h.
Samples that are not in line with the reference specimen during the verification process should not be placed in the test chamber. 5.3.3 Determination of mass loss
After the test, the reference specimen should be taken out immediately, the protective film on the back of the specimen should be removed, the corrosion products should be removed according to the physical and chemical methods specified in ISO8407, and it should be immersed in a 20% (mass fraction) analytical grade diammonium citrate [(NH4HCH4O4) aqueous solution at 23°C for 10 min. min. After immersion, wash the sample with water at room temperature, then wash it with ethanol, dry it and weigh it. The sample is weighed accurately to ±1m3. 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 every time corrosion products are removed. Note: According to the provisions of ISO8407, a 50% (volume fraction) hydrochloric acid (gm=1.18g/mL) solution can be added with 3.5g/L hexamethylenetetramine corrosion inhibitor to soak the sample to remove corrosion products, and then wash the sample with water at room temperature, then wash it with acetic acid, dry it and weigh it. 5.3.4 Operation test of acetic acid salt spray device
After 24h test, if the mass loss of the reference sample is within the range of 40g/m3 ±10g/m3, it means that the equipment is operating normally (see reference [21
5.4 Copper accelerated acetic acid salt spray test (CASS test) 5.4.1 Reference sample
The reference sample is 4 or 6 pieces of CR4 grade cold rolled carbon steel plates in accordance with ISO3574, with a plate thickness of 1mm±0.2mm and a sample size of 150mm×70m. The surface should be free of defects, i.e., no pores, scratches or oxidation color. Surface roughness Ra=0.8μm±0.3μm. The sample is cut from the cold rolled steel plate or strip.
The reference sample is put into the test immediately after being carefully cleaned. In addition to the provisions of 6.2 and 6.3, all dust, oil or other foreign matter that may affect the test results should be removed.
Use a clean soft brush or ultrasonic cleaning device to thoroughly clean the sample with an appropriate organic solvent (hydrocarbon with a boiling point between 60℃ and 120℃). 5
GB/T 101252012/IS0 9227:2006 Clean the specimen. After cleaning, rinse the specimen with a new solvent and then dry it. iiiKAa~cJouaKAa
The cleaned specimen is blown dry and weighed to the nearest ±1 mg, and then the back of the specimen is protected with a removable plastic film. The edges of the specimen can also be protected with a peelable plastic film.
5.4.2 Placement of reference specimens
The specimens are placed at the four corners of the chamber (if there are 6 specimens, they are placed at 6 different positions including the four corners), with the unprotected side facing up and at an angle of 20°±5° to the vertical direction. The reference specimen holder is made of or coated with an inflexible material (such as plastic). The lower edge of the reference specimen should be at the same level as the upper part of the salt spray collector. Test time 24 h.
Samples different from the reference specimens should not be placed in the test chamber during the verification process. 5.4.3 Determine the mass loss
After the test, the reference sample should be taken out immediately, the protective film on the back of the sample should be removed, and the corrosive products should be removed according to the physical and chemical methods specified in ISO8407. Soak in a 20% (mass fraction) analytical grade diammonium citrate [(NH), HCIIO) aqueous solution for 10 minutes at 23°C. After soaking, wash the sample with water at room temperature, then with ethanol, and weigh it after drying. Weigh the sample accurately to ±1mg. The mass loss per unit area is obtained by calculating the exposed area of ​​the reference sample. It is recommended to prepare a new solution each time the corrosion products are removed. Note: According to the provisions of ISO8407, 50% (volume fraction) salt solution (pz0=1.18g/mL) can be used, in which 3.5g/L of hexamethylenetetramine corrosion inhibitor is added, and the sample can be soaked to remove the corrosion products, and then the sample can be washed with water at room temperature, then washed with ethanol, and weighed after drying. 5.4.4 Operation inspection of copper accelerated acetic acid salt spray device After 24h test, the mass loss of each reference sample is within the range of 55g/m2 ± 15g/m2, indicating that the equipment is operating normally (see reference 21).
6 Samples
6.1 The type, quantity, shape and size of the sample shall be selected according to the relevant standards of the tested materials or products. If there is no standard, the relevant parties may negotiate and decide. Unless otherwise specified or agreed, the organic coating test panel used for the test shall comply with the substrate specified in [SO1514, with a size of approximately 150mm×100mm×1mm. Appendix C describes the preparation of organic coating test panels. Appendix D gives the supplementary information required for the test of organic coating test panels.
6.2 If there are no other provisions, the sample shall be thoroughly cleaned before the test. The decontamination method depends on the nature of the sample material. The sample surface and its dirt shall not be cleaned with abrasives or solvents that may erode the sample surface. After the sample is cleaned, care should be taken to avoid re-contamination. 6.3 If the specimen is cut from a T. workpiece with a cover layer, the cover layer near the cutting area must not be damaged. Unless otherwise specified, the cutting area should be protected with an appropriate cover layer such as paint, paraffin or tape. 7 Specimen placement
7.1 The specimen should not be placed in a position where the salt is directly sprayed. 7.2 The placement angle of the specimen surface in the salt spray chamber is very important. The specimen should be flat in principle. In the salt spray chamber, the test surface is 15 to 25° to the vertical direction, and as close to 20° as possible. For irregular specimens, such as the entire workpiece, it should also be as close to the above regulations as possible. 7.3 The specimens can be placed on different horizontal planes in the box, but they cannot touch the box body or each other. The distance between the specimens should not affect 6
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