GB/T 9790-2021: Metallic materials - Vickers and Knoop microhardness tests of metallic and other inorganic coatings

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Scope

This Standard specifies the principles, symbols and descriptions, equipment,
influencing factors of measurement accuracy, test procedures, uncertainty of results
and test reports of Vickers and Knoop microhardness tests of metallic and other
inorganic coatings.
This Standard is applicable to the determination of multiple coatings, such as:
electrodeposited coatings, autocatalytic coatings, sprayed aluminum coatings and
aluminum anodized coatings, etc. During the determination, the test force is generally
not greater than 9.807 N (1 kgf). 8.3 of this Standard is applicable to the determination
of microhardness of coating cross-sections. 8.4 of this Standard is applicable to the
determination of microhardness of coating surface.
NOTE 1: Part 1 ~ Part 4 of GB/T 18449 describes the test of Knoop hardness of metallic
materials. Part 1 ~ Part 4 of GB/T 4340 describes the test of Vickers hardness of
metallic materials. GB/T 21838 (all parts) describes instrumented indentation test
for metallic material hardness and material parameters.
NOTE 2: the test force of coatings is usually selected from the test force within the range
of Vickers microhardness in GB/T 4340.1-2009. However, since the test force
shall be as large as possible, the test force within the small force value of Vickers
hardness range of GB/T 4340.1-2009 may also be selected.

Basic Data

Standard ID	GB/T 9790-2021 (GB/T9790-2021)
Description (Translated English)	Metallic materials - Vickers and Knoop microhardness tests of metallic and other inorganic coatings
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H22
Word Count Estimation	20,215
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration