GB/T 5270-2024Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion (English PDF)

Foreword

This 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 Scope

This 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 References

There are no normative references for this Document.

3 Terms and Definitions

For 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.