GB/T 4957-2003: Non-conductive coatings on non-magnetic basis metals -- Measurement of coating thickness -- Eddy current

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Scope

This Standard describes a method for non-destructive measurements of the
thickness of nonconductive coatings on non-magnetic, electrically conductive
(generally metallic) basis materials, using amplitude-sensitive eddy current
instruments.
The method is particularly applicable to measurements of the thickness of most
oxide coatings produced by anodizing, but is not applicable to all conversion
coatings, some of which are too thin to be measured by this method (see Clause
7).
Although theoretically, the method can be used for measurements of the
thickness of coatings on magnetic basis materials, its use for this application is
not recommended. In such cases, the magnetic method specified in GB/T 4956
should be used.

Basic Data

Standard ID	GB/T 4957-2003 (GB/T4957-2003)
Description (Translated English)	Non-conductive coatings on non-magnetic basis metals. Measurement of coating thickness. Eddy current
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	A29
Classification of International Standard	25.220.40
Word Count Estimation	4,468
Date of Issue	2003-10-29
Date of Implementation	2004-05-01
Older Standard (superseded by this standard)	GB/T 4957-1985
Quoted Standard	GB/T 4956
Adopted Standard	ISO 2360-1982, IDT
Regulation (derived from)	China Announcement of Newly Approved National Standards No. 14 of 2003 (No. 62 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China
Summary	This standard specifies the stream will run side with twist- side volume meter thick non-magnetic base metal thickness of non-conductive cover his approach. This method is suitable for the majority of the anode side dish out of the film thickness. But it does not apply to all of the conversion coating. Some conversion coating is too thin rather than using this method because the side site (see Chapter 7). This method can theoretically based off the side of public progressive metal Tingyi thickness, but not recommended. In this case, should be adopted GB/T 4956 provided in the side of the magnetic method of volume.