GB/T 5270-2005 English PDF (GB/T5270-2005)

GB/T 5270-2005: Metallic coatings on metallic substrates -- Electrodeposited and chemically deposited coatings -- Review of methods available for testing adhesion
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GB/T 5270-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.20
A 29
GB/T 5270-2005 / ISO 2819.1980
Replacing GB/T 5270-1985
Metallic coatings on metallic substrates -
Electrodeposited and chemically deposited coatings -
Review of methods available for testing adhesion
(ISO 2819.1980, IDT)
Issued on June 23, 2005 Implemented on December 01, 2005
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Methods of test ... 4 
2.1 Burnishing test ... 4 
2.2 Ball burnishing test ... 5 
2.3 Shot peening test ... 5 
2.4 Peel test... 5 
2.5 File test ... 6 
2.6 Grinding and sawing tests ... 6 
2.7 Chisel test ... 6 
2.8 Scribe and grid test ... 6 
2.9 Bending test ... 7 
2.10 Twisting (winding) test ... 7 
2.11 Tensile test ... 7 
2.12 Thermal shock test ... 8 
2.13 Drawing test ... 8 
2.14 Cathodic test ... 9 
ANNEX  A DETERMINATION OF ADHESION OF SILVER DEPOSITS (100 to
600 μm) - SHOT-PEENING METHOD ... 11 
Foreword 
This Standard is the revision to standard GB/T 5270-1985. This Standard equivalently
adopts ISO 2819.1980 (E) Analysis on the Test Methods of Adhesive Strength of Metal
Coatings, Electro-deposition and Chemically Deposited Coatings on the Metal Matrix
(English version).
This Standard was re-drafted on the basis of ISO 2819, according to the editing
requirements of GB/T 1.1. This Standard has modified ISO 2819 as follows.
— Cancel the foreword of ISO 2819, and supplement the contents;
— Use “ this Standard” to replace “this International Standard”;
— For user-friendly, Chinese Standards that adopt international Standard have been
quoted.
Annex A of this Standard is informative.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Standardization Technology
Committee of Metallic and non-metallic coatings.
Drafting organization of this Standard. Mechanical Industry Product Quality Testing Center
of Surface Coatings.
Main drafters of this Standard. Song Zhiling, Zhong Lichang, Jiang Xinhua.
The historical version replaced by this Part is as follows.
— GB/T 5270-1985.
Metallic coatings on metallic substrates -
Electrodeposited and chemically deposited coatings -
Review of methods available for testing adhesion
1    Scope 
This Standard describes methods of checking the adhesion of electrodeposited and
chemically deposited coatings. It is limited to tests of a qualitative nature. Table 2 indicates
the suitability of each test for some of the most usual types of metallic coatings. Most of
the tests described are capable of destroying both the coating and the article being tested,
but some destroy the coating only. Even if the adhesion of the coating is found to be
satisfactory on articles not destroyed in testing, it should not be assumed that the articles
are undamaged. For example, the burnishing test (see 2.1) may render an article
unacceptable and the thermal shock test (see 2.12) may produce unacceptable
metallurgical changes.
This Standard does not describe certain tests which have been developed at various
times to give a quantitative measure of adhesion of metallic coating to a substrate since
such tests require special apparatus and considerable skill in their performance which
renders them unsuitable as quality control tests for production parts. Some of these
quantitative tests may, however, be useful in research and development work.
When particular methods of adhesion testing are included in Standards for individual
coatings, they should be used in preference to the methods described in this Standard
and should be agreed upon beforehand by the supplier and the purchaser.
2    Methods of test 
2.1 Burnishing test
If plated parts are subjected to burnishing in a localized area, the deposit will tend to
work-harden and absorb frictional heat. If the coating is thin, separation of the coating
from the basis metal as blisters will occur under these conditions in areas of poor
adhesion.
When the shape and size of the part permit, an area of not more than 6 cm2 of the plated
surface should be rubbed with a smooth implement for about 15 s. A suitable implement is
a steel rod 6 mm in diameter with a smooth hemispherical end.
The pressure shall be sufficient to burnish the coating at every stroke but not so great as
to cut the coating. Poor adhesion is indicated by the appearance of a blister which grows
GB/T 5270-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.20
A 29
GB/T 5270-2005 / ISO 2819.1980
Replacing GB/T 5270-1985
Metallic coatings on metallic substrates -
Electrodeposited and chemically deposited coatings -
Review of methods available for testing adhesion
(ISO 2819.1980, IDT)
Issued on June 23, 2005 Implemented on December 01, 2005
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Methods of test ... 4 
2.1 Burnishing test ... 4 
2.2 Ball burnishing test ... 5 
2.3 Shot peening test ... 5 
2.4 Peel test... 5 
2.5 File test ... 6 
2.6 Grinding and sawing tests ... 6 
2.7 Chisel test ... 6 
2.8 Scribe and grid test ... 6 
2.9 Bending test ... 7 
2.10 Twisting (winding) test ... 7 
2.11 Tensile test ... 7 
2.12 Thermal shock test ... 8 
2.13 Drawing test ... 8 
2.14 Cathodic test ... 9 
ANNEX  A DETERMINATION OF ADHESION OF SILVER DEPOSITS (100 to
600 μm) - SHOT-PEENING METHOD ... 11 
Foreword 
This Standard is the revision to standard GB/T 5270-1985. This Standard equivalently
adopts ISO 2819.1980 (E) Analysis on the Test Methods of Adhesive Strength of Metal
Coatings, Electro-deposition and Chemically Deposited Coatings on the Metal Matrix
(English version).
This Standard was re-drafted on the basis of ISO 2819, according to the editing
requirements of GB/T 1.1. This Standard has modified ISO 2819 as follows.
— Cancel the foreword of ISO 2819, and supplement the contents;
— Use “ this Standard” to replace “this International Standard”;
— For user-friendly, Chinese Standards that adopt international Standard have been
quoted.
Annex A of this Standard is informative.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Standardization Technology
Committee of Metallic and non-metallic coatings.
Drafting organization of this Standard. Mechanical Industry Product Quality Testing Center
of Surface Coatings.
Main drafters of this Standard. Song Zhiling, Zhong Lichang, Jiang Xinhua.
The historical version replaced by this Part is as follows.
— GB/T 5270-1985.
Metallic coatings on metallic substrates -
Electrodeposited and chemically deposited coatings -
Review of methods available for testing adhesion
1    Scope 
This Standard describes methods of checking the adhesion of electrodeposited and
chemically deposited coatings. It is limited to tests of a qualitative nature. Table 2 indicates
the suitability of each test for some of the most usual types of metallic coatings. Most of
the tests described are capable of destroying both the coating and the article being tested,
but some destroy the coating only. Even if the adhesion of the coating is found to be
satisfactory on articles not destroyed in testing, it should not be assumed that the articles
are undamaged. For example, the burnishing test (see 2.1) may render an article
unacceptable and the thermal shock test (see 2.12) may produce unacceptable
metallurgical changes.
This Standard does not describe certain tests which have been developed at various
times to give a quantitative measure of adhesion of metallic coating to a substrate since
such tests require special apparatus and considerable skill in their performance which
renders them unsuitable as quality control tests for production parts. Some of these
quantitative tests may, however, be useful in research and development work.
When particular methods of adhesion testing are included in Standards for individual
coatings, they should be used in preference to the methods described in this Standard
and should be agreed upon beforehand by the supplier and the purchaser.
2    Methods of test 
2.1 Burnishing test
If plated parts are subjected to burnishing in a localized area, the deposit will tend to
work-harden and absorb frictional heat. If the coating is thin, separation of the coating
from the basis metal as blisters will occur under these conditions in areas of poor
adhesion.
When the shape and size of the part permit, an area of not more than 6 cm2 of the plated
surface should be rubbed with a smooth implement for about 15 s. A suitable implement is
a steel rod 6 mm in diameter with a smooth hemispherical end.
The pressure shall be sufficient to burnish the coating at every stroke but not so great as
to cut the coating. Poor adhesion is indicated by the appearance of a blister which grows