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GB/T 5270-2024: Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 5270: Historical versions
GB/T 5270-2024: Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5270-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.220.40 CCS A 29 Replacing GB/T 5270-2005 Metallic Coatings on Metallic Substrates – Electrodeposited and Chemically Deposited Coatings – Review of Methods Available for Testing Adhesion (ISO 2819:2017, MOD) ISSUED ON: JUNE 29, 2024 IMPLEMENTED ON: JANUARY 1, 2025 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 5 4 Test Methods ... 6 4.1 Friction polishing test ... 6 4.2 Steel ball friction polishing test ... 6 4.3 Shot peening test ... 6 4.4 Peel test ... 7 4.5 File test ... 7 4.6 Grinding-sawing test ... 7 4.7 Chisel test ... 7 4.8 Scribing and cross-cutting test ... 8 4.9 Bend test ... 8 4.10 Wrapping Test ... 9 4.11 Tensile test ... 9 4.12 Thermal shock test ... 9 4.13 Deep-draw test ... 10 4.14 Cathode Test ... 11 4.15 Rockwell test ... 11 4.16 Scratch test ... 11 4.17 Cavitation test ... 11 5 General ... 12 Appendix A (Informative) Determination of Adhesion Strength of Silver Coating (100μm~600μm) by Shot Peening Method ... 13 A.1 Overview ... 13 A.2 Test equipment ... 13 A.3 Procedures ... 13 A.4 Evaluation ... 15 A.5 Adjustment of shot peening intensity ... 15 Bibliography ... 16ForewordThis Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents. This Document replaced GB/T 5270-2005 Metallic Coatings on Metallic Substrates - Electrodeposited and Chemically Deposited Coatings - Review of Methods Available for Testing Adhesion. Compared with GB/T 5270-2005, the major technical changes of this Document are as follows besides the structural adjustments and editorial modifications: --- Add quantitative measurement method in tensile test (see 4.11.2 of this Edition); --- Add Rockwell test (see 4.15 of this Edition); --- Add scratch test (see 4.16 of this Edition); --- Add cavitation test (see 4.17 of this Edition). This Document modified and adopted ISO 2819:2017 Metallic Coatings on Metallic Substrates -Electrodeposited and Chemically Deposited Coatings - Review of Methods Available for Testing Adhesion. Compared with ISO 2819:2017, this Document made the following structural adjustments: --- Split Figure A.1 into Figures A.1 and A.2; and add corresponding reference content to comply with China’s technical requirements. The technical differences and causes between this Document and ISO 2819:2017 are as follows: --- Add the scope of application (see Clause 1 of this Document) to meet the technical requirements of China; --- Add the principle of cavitation test (see 4.17 of this Document) to facilitate understanding. This Document made the following editorial modifications: --- Use national standards to replace the cited international standards to facilitate use. This Document was proposed by China Machinery Industry Federation. This Document shall be under the jurisdiction of National Technical Committee on Metallic and Non-Metallic Coatings of Standardization Administration of China (SAC/TC 57). Drafting organizations of this Document: China Academy of Machinery, Wuhan Research Institute of Materials Protection Co., Ltd.; Zhengzhou Coal Machinery Zhiding Hydraulic Co., Ltd.; Guangzhou Sanfu New Materials Technology Co., Ltd.; Zhejiang Dongci Technology Co., Ltd.; Hunan Yongsheng New Materials Co., Ltd.; Dongguan Jinluan Hardware Products Co., Metallic Coatings on Metallic Substrates – Electrodeposited and Chemically Deposited Coatings – Review of Methods Available for Testing Adhesion Warning: When special methods for adhesion strength tests are specified in national standards for specific coatings, the methods described in this Document should be used first, and the prior agreement of both the supplier and the purchaser should be obtained.1 ScopeThis Document reviews the test methods for checking the adhesion strength of electrodeposited and chemically deposited coatings, which are limited to qualitative tests. This Document applies to the selection of test methods for adhesion strength of electrodeposited and chemically deposited coatings on metallic substrates. This Document does not describe some quantitative test methods for the adhesion strength of metallic coatings and substrates developed at different times. Because such tests require special equipment and considerable skills in operation, they are not suitable as quality control tests for product parts, but some quantitative test methods can play a role in research and development work.2 Normative ReferencesThere are no normative references for this Document.3 Terms and DefinitionsFor the purposes of this Document, there are no terms and definitions apply. The websites of the terminology databases used in standardization work maintained by ISO and IEC are as follows: --- ISO Online Browsing Platform: http://www.iso.org/obp; --- IEC Electronic Encyclopedia: http://www.electropedia.org/. the structure of the deposit coating. These methods are particularly suitable for deposit coatings of harder metals, such as nickel or chromium. In any case, the obtained results shall be carefully analyzed because the ductility of the deposit coating and the base metal is involved. 4.14 Cathode Test The coating specimen is placed in the solution as a cathode, and hydrogen is precipitated on the cathode. As hydrogen diffuses, pressure accumulates at any discontinuity between the coating and the base metal, causing blistering of the coating. In a 5% (mass fraction) sodium hydroxide (density 1.054 g/mL) solution, the specimen is treated at a current density of 10A/dm2 and a temperature of 90℃ for 2 min; and small bubbles are formed in the parts of the coating with poor adhesion strength. If there is still no blistering in the coating after 15 min, the adhesion strength of the coating is good. In addition, sulfuric acid (5%, mass fraction) solution can be used; under the conditions of current density of 10A/dm2 and temperature of 60℃, after 5min~15min, the coating with poor adhesion strength shall blister. The electrolytic test is limited to the coating that can release hydrogen through the cathode. If the adhesion strength of nickel or nickel-chromium coating is poor, the test is more appropriate. Metal coatings such as lead, tin, zinc, copper or cadmium are not suitable for this test method. 4.15 Rockwell test According to ISO 26443, this test uses a Rockwell indenter to indent the surface of the specimen. After unloading the pressure, four adhesion strength levels from HF1 to HF4 are determined according to the peeling state of the coating at the indentation. 4.16 Scratch test According to EN1071 (all parts), this test uses a scratch tester to continuously scratch the coating with a diamond indenter. During the scratching process, the pressure applied to the indenter gradually increases until the coating begins to separate from the substrate. The critical pressure value at which the coating begins to separate from the substrate is used as the measurement value of the adhesion strength. 4.17 Cavitation test When immersed in liquid, the surface of the coating specimen vibrates at high frequency to produce cavitation damage. The vibration causes the formation and collapse of cavities in the liquid; and the collapsed cavities damage and erode the coating. According to ASTM G32, the adhesion strength of the coating may be related to the cavitation test load. The adhesion strength is evaluated by measuring the coverage of the electrodeposited coating after the cavitation test. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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