GB/T 4957-2003 in English

SUPERSEDED

Non-conductive coatings on non-magnetic basis metals—Measurement of coating thickness—Eddy current

Issued on:2003-10-29
Implemented on:2004-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

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Standard No:	GB/T 4957-2003
Document status:	SUPERSEDED
Superseded by:	GB/T 4957-2025 Non-conductive coatings on non-magnetic electrically conductive base metals—Measurement of coating thickness—Amplitude-sensitive eddy-current method
Superseded on:	2026-05-01
Title in English:	Non-conductive coatings on non-magnetic basis metals—Measurement of coating thickness—Eddy current
Title in Chinese:	非磁性基体金属上非导电覆盖层覆盖层厚度测量涡流法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2003-10-29
Implemented on:	2004-05-01
Superseding:	GB/T 4957-1985 Non-conductive coatings on non-magnetic metal substrates--Measurement of coating thickness--Eddy current method
ICS Classification:	25.220.40-Metallic coatings
Chinese Classification:	A29-Material Protection
Professional Classification:	GB-National Standard
Related Keywords:	non-magnetic basis metals measurement non-conductive coatings eddy current thickness gauges thickness eddy conversion coatings
Related Topics:	Eddy current method Eddy current method Substrate Thickness measurement Non-matrix Eddy Current Non-Conductive Material Thickness Measurement Gold Plating + Thickness Current Magnetic non-conductor materials non-magnetic metal Eddy current method of non-conductive coating on non-magnetic conductive substrate layer thickness Overlay Overlay non-polar layer gb4957 Magnetic and non-magnetic metals GBT4957 GB/T 4957-2003 Covering of metal parts Non-contact metal thickness detection method Standard Coverage Measurement Method Specification requirements for metal cladding gb/t 4957-2003 gb/t4957-2003 gbt4957 gb 4957- gb/t4957 gb/t 4957 gb 4957 gbt4957-2003

《GB/T 4957-2003非磁性基体金属上非导电覆盖层覆盖层厚度测量涡流法》由TC57（全国金属与非金属覆盖层标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了使用涡流测厚仪无损测量非磁性基体金属上非导电覆盖层厚度的方法。本方法适用于测量大多数阳极氧化膜的厚度；但它不适用于一切的转化膜，有些转化膜因为太薄而不能用这种方法测量。

Scope

This standard specifies the method for the non-destructive measurement of the thickness of non-conductive coatings on non-magnetic base metals using eddy current thickness gauges. This method is suitable for measuring the thickness of most anodized coatings; however, it is not suitable for all conversion coatings, some conversion coatings are too thin to be measured by this method (see Chapter 7). This method can theoretically measure the thickness of the coating layer on the magnetic base metal, but it is not recommended. In this case, the magnetic method specified in GB/T 4956 should be used for measurement.

More samples: QC/T 942-2021 JC/T 2453-2018 GB 50021-2001(2009)

Sample only — not a preview of GB/T 4957-2003

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