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Basic dataStandard ID: T/CSAE 132-2020 (T/CSAE132-2020)Description (Translated English): Outdoor accelerated corrosion test methods of automotive coating Sector / Industry: Chinese Industry Standard Classification of Chinese Standard: T40 Word Count Estimation: 14,132 Date of Issue: 29/5/2020 Date of Implementation: 29/5/2020 Issuing agency(ies): China Society of Automotive Engineers TCSAE132-2020: Outdoor accelerated corrosion test methods of automotive coating---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.T/CSAE 132-2020 Outdoor accelerated corrosion test methods of automotive coating ICS 43.040 T 40 Group standard Outdoor accelerated corrosion test method for automobile coating 2020-05-29 released 2020-05-29 Implementation Issued by Chinese Society of Automotive Engineering Table of contentsForeword...II 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 Test solution...1 5 Test equipment...2 5.1 Spray device...2 5.2 Open exposed frame...2 5.3 Scratch Knife...2 6 Specimen...2 6.1 Requirements of the sample...2 6.2 Reference sample...2 6.3 Reference sample storage...2 6.4 Sample cleaning...3 6.5 Status adjustment...3 6.6 Edge banding...3 7 Test period and test cycle...3 7.1 Setting method of test period...3 7.2 Detection cycle...3 8 Test procedure...3 8.1 Test preparation...3 8.2 Putting into test...4 8.3 Detection method...5 9 Monitoring of Corrosion Characteristics of Exposure Site...5 9.1 General requirements...5 9.2 Measurement of atmospheric environmental data...5 9.3 Requirements for standard samples...6 10 Result Evaluation...7 11 Test report...7 Appendix A (Informative Appendix) Record Form...8 References...10ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that some content of this standard may involve patents, and the issuing organization of this standard does not bear the responsibility for identifying these patents. This standard was proposed by the Automobile Anti-Corrosion and Aging Branch of the Chinese Society of Automotive Engineering. Drafting organizations of this standard. Hainan Tropical Automotive Testing Co., Ltd., Q-Lab China Representative Office, Zotye Automotive Engineering Research Institute, Chongqing Changan Automobile Co., Ltd., Institute of Metal Research, Chinese Academy of Sciences, FAW-Volkswagen Automobile Co., Ltd., FAW Jiefang Qingdao Automobile have Co., Ltd., Shanghai Fischer Automotive Technology Service Co., Ltd., China FAW Co., Ltd. Tianjin Technology Development Branch, China Heavy Automobile Group Co., Ltd. Technology Research Institute, Anhui Jianghuai Automobile Group Co., Ltd., China Automobile Research Institute Automobile Inspection Center (Tianjin) Co., Ltd. Division, Xinjiang Turpan Natural Environment Experimental Research Center, FAW-Volkswagen Chengdu Branch. The main drafters of this standard. Ma Yingbin, Zhang Jiaolang, Zhang Heng, Wang Naxin, Huang Ping, Chen Liang, Huang Xu, Wang Zhenyao, Zhang Li, Ma Lijuan, Zhang Yue, Xu Qingmei, Zhao Xiaohong, Li Yuning, Tang Yugang, Duan Fangyong, Sun Xinglei, Zhang Zhisong, Guo Chunyun, Mi Yi. Outdoor accelerated corrosion test method for automobile coating1 ScopeThis standard specifies the site, test conditions, and instrument for the accelerated corrosion test method of salt spray spraying for automotive parts and materials in a typical natural environment. Equipment, test samples, measurement methods and result evaluation methods. This standard is applicable to outdoor applications where metal surfaces such as steel, zinc, aluminum, copper and their alloys for automobiles are covered with organic coatings or other conversion coatings. Rapid corrosion test.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 1766 Paint and varnish coating aging rating method GB/T 13452.2 Determination of film thickness of paints and varnishes GB/T 30789.1～9 Paint and varnish coating aging evaluation The number and size of defects and the identification of the degree of uniform change in appearance GB/T 31973 Natural exposure test method for automobile non-metallic materials and components3 Terms and definitionsThe following terms and definitions apply to this standard. 3.1 Scratch delamination width The width of the loss of adhesion of various films at the scratches. The length of the left and right ends where the film loses adhesion at the measurement point. 3.2 Scratch corrosion width All kinds of films at the scratches have visible corrosion width. The distance from the edge of the scribe line to the farthest point of corrosion. 3.3 Scratch Corrosion depth There are visible corrosion points in all kinds of film layers at the scratches, which develop to the depth of the base metal.4 Test solutionAll reagents used in this standard are analytical reagents and above. The conductivity of distilled water or deionized water for spraying in this standard is ≤20 μS/cm. The mass concentration of sodium chloride solution for spraying in this standard is 5% ± 1%, and the pH is 6.5 to 7.2. Note 1.pH measurement should be carried out under the environmental conditions of 25 ℃ ± 2 ℃. Note 2.If the pH of the configured sodium chloride solution exceeds the requirements of this standard, it can be adjusted with 0.5 mol/L hydrochloric acid, sodium hydroxide or sodium bicarbonate solution.5 Test equipment5.1 Spray device Manually pressurize the salt solution to produce a spray device that disperses the mist as much as possible. 5.2 Open exposed frame Outdoor accelerated corrosion test device for placing test samples. The open exposed rack can be designed according to GB/T 31973 requirements, applicable Used in the exposure test of samples of various shapes and sizes of exterior materials and components. Generally made of aluminum alloy material. Aluminum alloy exposure frame is suitable for each In areas with different climate types, properly painted steel materials and untreated wood are suitable for desert areas, and copper-nickel alloys are suitable for Highly corrosive areas. The exposure frame should have sufficient length and width to install and fix the specimens to ensure that the specimens do not affect each other. Generally when installing the sample Use insulating porcelain clamps, plastic stop pins, wooden brackets, cables and anticorrosive liners, fastening screws, etc. In order to prevent the sprayed solution from flowing from one sample to another, the position of the exposed rack to install the sample must be such that all sides of the sample can be exposed. Exposed to the air. The exposure rack should be placed in an open and unobstructed place. The minimum height of the specimen installed on the exposure rack from the ground is 0.45 m to avoid contact with surface objects and prevent accidental damage to the specimen during exposure. 5.3 Scratch knife The tool for scratching the sample, the width of the cutter head is 0.5 mm, and the recommended scratching tool has a rectangular cross-section, which can be used to scratch the metal substrate. A scratch with a width of 0.5 mm is produced. The use of scratch tools with other specifications should be agreed with the relevant parties.6 Sample6.1 Requirements for samples The samples used for outdoor corrosion test can be parts or samples. In order to ensure the accuracy of the test results, 3 samples are recommended Used for parallel testing. The size of the parts should be able to ensure the scratch processing, and the scratch surface should be as flat as possible. Unless otherwise specified, the sample size is 150 mm×250 mm×(0.6～1.5)mm. The material, thickness, size and surface pretreatment of the sample to be tested shall be consistent in all tests. And as much as possible to represent the actual condition of auto parts. Any deviation of parameters will lead to errors in the test results. For each sample, To record the following related data information. a) Description of test materials, surface treatment material method, substrate type, pretreatment method, paint type, spraying method And the thickness of the coating under dry conditions; b) If the sample is used for destructive testing, the shape and location of the damage and the destructive test method need to be explained; c) Reference materials or information used to compare test materials. 6.2 Reference sample The reference sample requirements are qualified standard samples produced in the same batch as the samples, and are mainly used for reference comparison during visual inspection. 6.3 Storage of reference samples Standard samples are required to be stored in a dark place under standard environmental conditions with an air temperature of 23 ℃ ± 2 ℃ and a relative humidity of 50% ± 5%. Note. The environment (including air) where the standard samples are stored should be kept fresh and clean without any pollutants. 6.4 Sample cleaning Unless otherwise specified, the sample should be thoroughly cleaned before the test. The cleaning method depends on the nature of the sample material, cleaning the sample surface and decontamination During the process, avoid using abrasives or solvents that may etch the surface of the specimen. After cleaning the sample, care should be taken to avoid contamination again. 6.5 Status adjustment After the sample is cleaned and dried, it is adjusted for more than 24 hours under the standard environmental conditions of 23 ℃ ± 2 ℃ and relative humidity of 50% ± 5%. in case There is no standard environmental state adjustment laboratory, and it can be adjusted for more than 24 hours under conventional test conditions. 6.6 Edge banding treatment In order to avoid the rusty water produced by the early corrosion of the edge of the sample from polluting the coating and affecting the corrosion test area, it should be around the sample before the test Use waterproof tape or paint to seal the edges. For samples with hanging holes, paint should be used to seal the hanging holes before the test.7 Test period and test cycle7.1 Setting method of test period 7.1.1 In addition to considering the sample type, purpose and test purpose, the test period should also be considered to be able to accurately grasp the corrosion aging process of the sample performance. 7.1.2 The test period can be set in terms of time (such as month, year), or change in sample performance (such as corrosion amount, discoloration, etc.) The extent of damage) reaches a specified limit value in units, and the test period can also be negotiated according to the relevant technical requirements of the material or sample. 7.1.3 If there is no special requirement, the test period shall be at least 6 months. If there is no obvious corrosion during the test period, the test time can be extended by 3 months. 7.2 Detection cycle Unless otherwise agreed, during the entire test period, the inspection cycle for various performance changes is recommended to be once a month, and the inspection cycle can also be adjusted according to the corrosion rate.8 Test procedure8.1 Test preparation 8.1.1 Determination of measurement location For the surface and component assembly that require visual inspection, the inspection location should be selected in the most conspicuous area that receives the most solar radiation energy. Draw The measurement position for trace corrosion should be selected below the visual inspection position. 8.1.2 Pre-exposure testing Before the test, clean and adjust the state according to the requirements of 6.4 and 6.5, and then test according to the methods specified in 8.3.1 ~ 8.3.3, unless It is also stipulated that the sample should be tested under the same environmental conditions as its state adjustment. 8.1.3 Scratch treatment A 100 mm long vertical scratch and a 50 mm long horizontal scratch should be drawn at the determined measurement position. The horizontal scratch is perpendicular to the vertical scratch and Below the vertical scratch, two scratches do not intersect each other. The depth of the scratch is through the surface coating to reach the metal substrate, unless otherwise specified, the width of the scratch is 0.5 mm. The mutual distance of all scratches should be at least 50 mm, and the distance between the scratches and the edge of the sample should be at least 20 mm. The schematic diagram of the scratch position of the template is shown in Figure 1. For galvanized sheets or galvanized alloy steel sheets, the results of the corrosion test are very different from the penetration coating and the coating. Test should agree on scratches The degree of scratching the coating and plating. After the sample is scratched, it should be put into the outdoor exposure corrosion test within 1 h. 8.2 Putting into test 8.2.1 Exposure method The effective surface of the outdoor exposure test specimen faces the south direction. In order to adapt to special test purposes, it can also be placed in any direction. unless It is also agreed that 45 degrees is recommended for the exposure angle. 8.2.2 Exposure status During the exposure test, ensure that the samples do not interfere with each other, and do not block each other from sunlight. All sides of the sample should be exposed to the air. If the sample It is rectangular, and its shortest side is parallel to the horizontal line when installed. Under no special circumstances, try not to move or touch the sample during the test. 8.2.3 Spray salt mist After the sample is installed in the exposure rack, use a spray device to evenly spray the prepared salt solution onto the surface of the sample, starting from the upper end of the sample Until the lower end, when the salt solution starts to drip, stop spraying. During the spraying process, avoid affecting other nearby test samples. Unless otherwise agreed, after the test, the first spray interval is 3 days, the second spray interval is 4 days, and so on. Spraying should be done after the dew has evaporated in the early morning. When spraying, if there is snow on the surface of the sample, the snow should be removed without damaging the surface of the sample. Then spray again. If the ambient air temperature is lower than -10 ℃, stop spraying to prevent the salt solution from freezing on the sample surface. 8.3 Detection method Unless otherwise specified, the environmental conditions during the test are consistent with the conditions for adjusting the state of the sample. 8.3.1 Coating thickness detection If there is no special requirement, the total thickness of the paint film coating shall be measured according to GB/T 13452.2 before the sample is scratched. 8.3.2 Scratch corrosion detection According to the selected measurement period, observe the time, state and corrosion products of scratches. Measure vertical and horizontal scratches Trace delamination width and scratch corrosion width, record measurement data in mm. For the test of the scratch delamination width, unless otherwise agreed, the evaluation shall be carried out immediately after the test is completed. If after a long period of adjustment Assessment, during this period, its adhesion may be restored. The scratch delamination width is measured according to the relevant regulations of GB/T 30789.8. Scratch corrosion width shall be measured according to relevant regulations of GB/T 30789.9. 8.3.3 Visual inspection of appearance Corrosion and aging phenomena such as blistering, rusting, cracking, flaking, chalking, etc. can be visually inspected according to the relevant regulations of GB/T 30789.1～7 an examination. It can also be inspected and rated according to the evaluation method specified in the standard GB/T 1766.When checking, you can choose to clearly distinguish the corrosion products Magnifying glass, visually inspect the sample. Note. The visual inspection of dialysis, frosting and other aging phenomena should be carried out before the sample is cleaned. 8.3.4 Corrosion resistance test After the test is over, the final evaluation of the corrosion resistance of the sample must be made. If the corrosion resistance of the uniformly corroded sample substrate There are also test requirements, and a suitable method can be used to remove the surface coating. In order to ensure the consistency of the evaluation of corrosion results, according to GB/T 6461 The standard requires that the sample after the removal of corrosion products be evaluated by the area method.9 Monitoring of corrosion characteristics of exposure sites9.1 General requirements Since the test results mainly depend on the geographic location of the exposure site and the exposure conditions, it is necessary to measure the atmospheric corrosion in the exposure site You can choose to use the method of directly measuring the corrosion rate of the standard sample (see 9.3), or you can choose to use the measurement of the atmospheric environment of the exposure site. According to the method, or use the two methods together. If you use valid atmospheric environmental data from locations other than the exposure site, you must say State the geographic location of the location and the distance from the exposure site. 9.2 Measurement of atmospheric environmental data Throughout the test process, the measurement of atmospheric environmental data can be carried out according to the requirements specified in Table 1. 9.3 Requirements for standard samples 9.3.1 Material of standard specimen The corrosion rate of the standard sample can be used to reflect the corrosion characteristics of the exposed field in a specific period of time. Usually, standard samples of the following materials can be used for testing. a) Carbon steel (copper 0.03%～10%, phosphorus < 0.07%); b) Zinc, purity ≥98.5%; c) Copper, purity ≥99.5%; d) Aluminum, purity ≥99.5%. 9.3.2 Dimensions of standard specimens The standard sample must be rectangular in shape, with a size of not less than 50 mm×100 mm, and a thickness of about 1 mm. 9.3.3 Pretreatment of standard samples Before the test, the standard samples must be marked and cleaned using the following methods. a) Manually clean with a soft, clean brush, or place the standard sample in an organic solvent (such as boiling point 60 ℃ ~ 120 ℃ Hydrocarbons) in the utensils for ultrasonic cleaning. After cleaning, rinse with clean organic solvent and dry; b) Other methods can also be used for cleaning, but the cleaning effect must be equivalent to method a). 9.3.4 Corrosion rate test of standard specimen Select three standard specimens of the same specification for parallel testing according to the method specified in Chapter 9.Before the test starts, the The quasi-sample is weighed to the nearest ±1 mg. After the test is completed, the corrosion products of the standard sample can be removed according to the relevant regulations in ISO 8407. Then weigh it to the nearest ±1 mg. 10 Results evaluation The test results can be evaluated according to the relevant regulations of the standard GB/T 30789.1-7, or according to the relevant regulations of the standard GB/T 1766. The general test only considers the following aspects. a) The appearance of the part other than the score line of the sample, such as blistering, rust, cracking, shedding, chalking, filiform corrosion, etc.; b) Appearance, degree of scratch delamination, degree of scratch corrosion, etc. of the scratched part of the sample c) Quality changes. 11 Test report The test report must specify the evaluation criteria used and the test results obtained. If necessary, there should be test results for each sample, each group Average test results of the same sample and ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of TCSAE132-2020_English be delivered?Answer: Upon your order, we will start to translate TCSAE132-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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