GB/T 6462-2005 English PDF (GBT6462-2005)

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GB/T 6462-2005: Metallic and oxide coatings -- Measurement of coating thickness -- Microscopical method
GB/T 6462-2005
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.20
A 29
GB/T 6462-2005 / ISO 1463:2003
Replacing GB/T 6462-1986
Metallic and oxide coatings - Measurement of coating
thickness - Microscopical method
(ISO 1463:2003, IDT)
ISSUED ON: JUNE 23, 2005
IMPLEMENTED ON: DECEMBER 01, 2005
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Principle ... 6 
5 Factors relating to measurement uncertainty ... 6 
6 Preparation of cross-sections ... 9 
7 Measurement ... 9 
8 Measurement uncertainty ... 9 
9 Test report ... 10 
Annex A (Informative) Guidance on the preparation and measurement of cross-
sections ... 11 
Annex B (Informative) Taper of cross-section and measurement of tooth-
constructed coatings ... 14 
Annex C (Informative) Some typical etchants for use at room temperature ... 17 
Bibliography ... 18 
Foreword
This Standard is identical to ISO 1463:2003 “Metallic and oxide coatings -
Measurement of coating thickness - Microscopical method” (English edition).
This Standard is identical to translation of ISO 1463:2003.
For ease of use, this Standard has made the following editorial changes:
a) CHANGE the word 'this International Standard' to 'this Standard';
b) CHANGE the word 'this country' to 'country';
c) USE a decimal point '.' instead of a comma ',' as a decimal point;
d) Delete the Foreword of the international standard.
This Standard replaces GB/T 6462-1986 "Metallic and oxide coatings -
Measurement of coating thickness - Microscopical method". Compared with
GB/T 6462-1986, the main changes are as follows:
- CHANGE the standard name to "Metallic and oxide coatings -
Measurement of coating thickness - Microscopical method"; [Translator
note: Chinese name of this Standard has been changed.]
- ADD the scope of application of measurement method (Clause 1);
- ADD Normative references (Clause 2);
- ADD definition of local thickness (Clause 3);
- ADD Annex B.
Annexes A, B, and C of this Standard are informative annexes.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
57 on Metallic and Non-metallic Coating of Standardization Administration of
China (SAC/TC 57).
Responsible drafting organizations of this Standard: Wuhan Research Institute
of Materials Protection, Ningbo Yongxin Optics Co., Ltd.
Main drafters of this Standard: Zhang Dezhong, Zeng Lizhu, Chen Xiaofan,
Wang Cheng.
Metallic and oxide coatings - Measurement of coating
thickness - Microscopical method
1 Scope
This Standard describes a method for the measurement of the local thickness
of metallic coatings, oxide layers, and porcelain or vitreous enamel coatings, by
the microscopical examination of cross-sections using an optical microscope.
WARNING: The use of this Standard may involve the use of hazardous
materials, operations and equipment. This Standard does not address any
health hazard and safety issues associated with its use. It is the
responsibility of the user to establish appropriate health and safety
practices and to take suitable action to comply with any national or local
regulations prior to its use.
2 Normative references
The following documents contain provisions which, through reference in this
Standard, constitute provisions of this Standard. For the dated references, their
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest editions of these
documents are applicable. For undated reference documents, the latest
editions apply to this Standard.
GB/T 12334 Metallic and other inorganic coatings - Definitions and
conventions concerning the measurement of thickness (idt ISO 2064)
3 Terms and definitions
The terms and definitions established by GB/T 12334 and the following ones
apply to this Standard.
Local thickness
The mean of the thickness measurements, of which a specified number is made
within a reference area.