This standard specifies the reagents, equipment and procedures for the corrosion paste method for evaluating the quality of metal and other inorganic coatings. This method is mainly applicable to copper-nickel-chromium or nickel-chromium plated parts. GB/T 6465-2008 Corrosion paste corrosion test for metals and other inorganic coatings (CORR test) GB/T6465-2008 Standard download decompression password: www.bzxz.net
This standard specifies the reagents, equipment and procedures for the corrosion paste method for evaluating the quality of metal and other inorganic coatings. This method is mainly applicable to copper-nickel-chromium or nickel-chromium plated parts.
class="f14" style="padding-top:10px; padding-left:12px; padding-bottom:10px;"> This standard is equivalent to ISO 4541:1978 "Corrosion paste corrosion test for metals and other inorganic coatings (CORR test)" (English version).
For ease of use, this standard has been edited as follows:
--- The foreword of the international standard has been cancelled;
--- The Chinese standard adopting the international standard has been quoted;
--- This standard replaces this international standard.
This standard replaces GB/T6465-1986 "Corrosion test of metals and other inorganic coatings by corrosive paste (CORR test)". Compared with GB/T6465-1986, the main changes are as follows:
---ISO1462 has been replaced by ISO10289:1999, and the corresponding national standard is GB/T6461-2002;
---ISO3768 has been replaced by ISO9227:1990, and the corresponding national standard is GB/T10125-1997;
---Introduction to normative references has been added;
---The standard format has been re-edited in accordance with the standard format of China.
This standard is proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coatings (SAC/TC57). The
drafting units of this standard are: Wuhan Institute of Materials Protection, Ma'anshan Dingtai Rare Earth New Materials Co., Ltd., and Beijing Yongtaihe Anti-Corrosion Technology Co., Ltd.
The main drafters of this standard are: Yu Jing, Huang Yerong, Zhang Hongwei, Shi Zhimin, Liu Jilu, Xu Yanfei, Pan Lin, Jia Jianxin.
The previous versions of the standards replaced by this standard are:
---GB/T6465-1986.
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this standard.
GB/T6461 Rating of samples and test pieces after corrosion tests of metal and other inorganic coatings on metal substrates (GB/T6461-2002, ISO10289:1999, IDT)
GB/T10125 Artificial atmosphere corrosion test Salt spray test (GB/T10125-1997, eqvISO9227:1990)

ICS 25. 220. 40
National Standard of the People's Republic of China
GB/T 6465—2008/ISO 4541: 1978 replaces GB/T6465—1986
Metallic and other non-organic coatings--Corrodkotecorrosion test(CORR test)
(ISO 4541:1978, IDT)
Published on June 19, 2008
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implemented on January 1, 2009
GB/T6465--2008/LS04541:1978
This standard is equivalent to ISO 4541:1978 "Corrosion of metal and other inorganic coverings - Corrosion test (CORR test)"
(English version).
For ease of use, this standard has made the following editorial changes: the foreword of the international standard has been cancelled;
Chinese standards that adopt the international standard have been cited; "this international standard" is replaced by "this standard". This standard replaces GB/T 6465-1986 "Corrosion of metal and other inorganic coverings - Corrosion test (CORR test)". Compared with GB/T6465-1986, the main changes are: - ISO1462 has been replaced by ISO10289:1999, and the corresponding national standard is GB/T6461-2002; ISO3768 has been replaced by ISO9227:1990, and the corresponding national standard is GB/T10125-1997: - The introduction of normative reference documents has been added; ... The standard format has been re-edited according to the standard format of our country. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Metallic and Non-metallic Chip Coverings (SAC/TC 57). The drafting units of this standard: Wuhan Institute of Materials Protection, Ma'anshan Dingtai Rare Earth New Materials Co., Ltd., Beijing Yongtaihe Anti-Corrosion Technology Co., Ltd.
The main drafters of this standard! Yu Jing, Huang Yerong, Zhang Hongwei, Shi Zhimin, Liu Jilu, Xu Jianfei, Pan Lin, Jia Jianxin. The previous versions of the standard replaced by this standard are: GB/T64651986.
GB/T6465—2008/IS04541:1978 Introduction
In many cases, the results of accelerated corrosion tests have no direct relationship with the corrosion resistance in other media, because the factors affecting the corrosion process, such as the formation of protective films, vary greatly from the conditions encountered. Therefore, the results of test observations should not be used as a direct guide to the corrosion resistance of the test materials in all occasions, and the characteristics of different materials in the test cannot always be used as a direct guide to the relative corrosion resistance of these test materials in use.
1 Scope
GB/T 6465--2008/ISO 4541:1978 Metallic and other inorganic coatings
Corrosion test (CORR test)
This standard specifies the reagents, equipment and procedures for the corrosion method for evaluating the quality of metallic and other inorganic coatings. This method is mainly applicable to copper-nickel-chromium or nickel-chromium plated parts. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T 6461 Metallic and other inorganic coatings on metal substrates - Rating of specimens and test pieces subjected to corrosion tests (GB/T 6461--2002, ISO 10289: 1999, JIDT) CB/T10125 Artificial atmosphere corrosion test - Salt spray test (GB/T10125--1997, eqvISO9227:1990) 3 Principle
Apply mud containing corrosive salts on the specimen. After the mud paste dries, place the specimen in a humid chamber with high relative humidity and expose it for a specified time period.
4 Preparation of corrosion
In a glass beaker, dissolve 0.035 g of reagent grade copper nitrate [Cu(NO2+)2·3H2O], 0.165 g of reagent grade ferric trifluoride [FeCl2+·6H2O] and 1.0 g of reagent grade ammonium chloride [NH4Cl2] in 50.0 mL of distilled water, stir, add 30.0 g of water-washed ceramic grade kaolin, stir with a glass rod to fully mix the slurry and let it stand for 2 minutes to allow the kaolin to be fully soaked. Stir with a glass rod again before use to fully mix. Note 1: Another method for preparing the corrosion paste is as follows: weigh 2.50 g of copper nitrate [Cu(NO,)2~3H:O] and dilute it to the mark with distilled water in a 500 mL volumetric flask, weigh 2.50 g of ferric nitride [FeCl · 6H,0] and dilute it to the mark with distilled water in a 500 mL volumetric flask, weigh 50.0 g of ammonium chloride [NH,Cl] and dilute it to the mark with distilled water in a 500 mL mother bottle, then take 7.0 mL of copper nitrate solution, 33.0 mL of ferric dicyanide solution and 10.1 mL of ammonium oxide solution in a beaker and add 30.0 kaolin, stir with a glass, Note 2: The ferric dicyanide solution must be stored in a flask with a rubber stopper or a glass stopper in a dark place, and the storage period should not exceed two weeks. Because if it is left for too long, the solution will become unstable.
5 Equipment
5.1 The equipment includes a humidity chamber, a sample holder, a heating device and an air circulation device in the chamber. 5.2 The chamber should be designed so that the droplets accumulated on the chamber top, chamber wall or sample holder will not fall on the sample. 5.3 The structural materials used shall not affect the test. 6 Samples
6.1 The number and type of samples selected and the criteria for evaluating the test results are determined according to the test coating or product specifications. 6.2 Before the test, the sample can be cleaned with an appropriate solvent such as ethanol, ether, acetone or petroleum ether. Solvents that are corrosive or can form a protective film shall not be used.
GB/T6465—2008/ISO4541:1978
6.3 Use a clean (paint) brush to apply the corrosive coating to the sample, use a brush with corrosive coating to make circular movements on the sample to completely cover the sample, and then use the brush to gently smooth the coating in one direction. The thickness of the paste film shall not be less than 0.08 mm nor greater than 0.2 mm. Before placing the specimen in the humidity chamber, dry it for 1 hour at room temperature and relative humidity below 50%. 6.4 If the specimen is cut from a larger plated workpiece, the cover layer should not be damaged during cutting, especially the cover layer in the area near the cut. Care should be taken to avoid contamination of the specimen by slag during cutting. Unless otherwise specified, the cut edge can be fully protected by materials such as paint, varnish, paraffin or tape that are stable under the test conditions.
7 Position of the specimen during the test
The position of the specimen in the humidity chamber during the test is not strictly specified, as long as the specimens do not touch each other or the chamber wall, and the specimen holder does not touch the surface of the specimen covered with the etching paste. 8 Conditions in the humidity chamber
The temperature of the exposure zone of the humidity chamber is maintained at 38℃±1C. The relative humidity of the exposure zone in the chamber is maintained between 80% and 90% so that condensation does not form on the specimen. Condensation is allowed on the top and walls of the chamber as long as the humidity in the chamber is not less than 80%. Note: A humidity cabinet equipped with a ventilating device shall be selected so that the temperature and temperature in the cabinet are uniform. The air circulation rate in the cabinet shall be determined to be necessary for each cabinet to maintain the above conditions.
9 Test cycle
9.1 Unless otherwise specified for the coating or product under test, a continuous exposure in the humidity cabinet for 16 h is considered as one cycle. The humidity cabinet shall be operated continuously in the closed state except for brief interruptions required for placing or removing the specimens, and these interruptions shall be kept to the minimum time. 9.2 If the specified test cycle is more or less than 16 h, the specimens shall be treated as specified in 11.1 and 11.2 after each test cycle. Fresh etching paste shall be applied for each subsequent cycle. After the test, the specimens shall be treated as specified in 11.1, 11.2 and 11.3. 10 Test time
The time of each test cycle and the required number of test cycles shall be as specified in the specification of the coating or product under test. 11 Treatment of specimens after testing
11.1 Unless otherwise specified for the test material, the specimens shall be treated according to 11.2 after each test cycle. After the last test cycle, or during the test cycle, the specimens shall be treated according to 11.2 and 11.3. 11.2 Remove the specimen from the humidity chamber and first check for specimens with intact mud paste, then wash with fresh running water and remove all mud with a clean cheesecloth or artificial sponge. A soft abrasive may be used to remove any firmly adhering material. 11.3 Remove the corrosion products by cleaning as described in 11.2 so that the corrosion sites can be reproduced by the following methods, such as exposure for 4 h in a salt spray chamber as specified in GB/T10125; exposure for 24 h in a humidity chamber at a temperature of 38°C, a relative humidity of 100% and condensation, or by other methods that can cause corrosion of the substrate without damaging the coating. Note: Visible corrosion products on the specimen with mud are not necessarily caused by corrosion sites in the protective layer. Metal particles accidentally attached to the specimen before the humidity chamber test can also cause visible corrosion products. Be sure to avoid such contamination. 12 Evaluation of results
The evaluation criteria for test results are usually given in the specifications of the covering layer or the tested product. For general tests, only the following points need to be considered:
a) Appearance after the test;
b) Appearance after removing surface corrosion products; c) The number and distribution of corrosion defects, such as pits, cracks, bubbles, etc. It can be evaluated according to the method specified in GB/T6461. 2
Test report
Unless otherwise specified in the specification, the test report shall include the following: a)
Specifications of the tested substrate material;
Type of covering layer and description of surface treatment; Number of specimens of each tested product or covering layer; Shape and size of the specimen and area and surface condition of the tested surface: GB/T 6465--2008/IS 4541:1978 Preparation of specimens, including all cleaning treatment methods used and protection methods for cut edges or other special parts! The cleaning method used for the specimen after the test, and if necessary, the weight loss caused by cleaning; the temperature reading of the exposure zone of the humidity cabinet; the humidity reading of the exposure zone of the humidity cabinet; the exposure time of each cycle and the number of cycles; the measures taken to fully meet all the requirements specified in this standard; the condition of any reference test pieces placed in the cabinet at the same time as the specimen; all observed results. bzxz.net
GB/T 6465-2008
People's Republic of China
National Standard
Metal and other inorganic cover rate
Corrosion paste corrosion test (COKR test)
GB/T 6465—2008/ISO 4541:1978 Published and distributed by China Standards Press
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