GB/T 6462-1986
Replaced
GB/T 4957-2025
Active
National standards
GB/T 4957-2025 Non-conductive coatings on non-magnetic electrically conductive base metals—Measurement of coating thickness—Amplitude-sensitive eddy-current method
GB/T 4957-2025 Non-conductive coatings on non-magnetic electrically conductive base metals—Measurement of coating thickness—Amplitude-sensitive eddy-current method
Basic Information
Standard Code:
GB/T 4957-2025
Standard Type:
National standards
Standard Status:
Active
is_force_gb:
no
CCS Name:
Material protection
ICS Name:
\nMetal plating
Publish Date:
2025-10-31
Implement Date:
2026-05-01
Publisher:
国家市场监督管理总局、国家标准化管理委员会
Technical Committee:
全国金属与非金属覆盖层标准化技术委员会(SAC/TC 57)
Pages:
36 pages
Scope
本文件描述了利用振幅敏感涡流仪对非磁性导电基体金属上的非导电覆盖层厚度进行无损测量的方法。
在本文件中，术语“覆盖层”适用于诸如色漆和清漆、电镀层、搪瓷涂层、塑料涂层、包覆层和粉末涂层等材料。本文件适用于大多数阳极氧化膜厚度的测量，对于一些厚度过薄的转化膜层，该方法不适用（见第6章）。本文件还能用于非导电基材上的非磁性金属覆盖层厚度的测量。然而，GB/T 31554规定的相敏涡流法尤其适用于该应用，并且能提供更高精度的厚度测量结果（见附录A）。
本文件不适用于测量导电基体金属上的非磁性金属覆盖层。GB/T 31554规定的相敏涡流法特别适用于此应用。但是，在电导率非常小的超薄涂层的特殊情况下，振幅敏感涡流法也能用于此应用（见附录A）。
虽然该方法能够用于测量磁性基体金属上的覆盖层厚度，但该应用不推荐。在这种情况下，使用GB/T 4956规定的磁性测厚方法。只有在覆盖层厚度超过约1 mm时，振幅敏感涡流法也能用于此应用（见附录A）。
Development Information
Drafting Units:
中国机械总院集团武汉材料保护研究所有限公司、东方电气集团东方汽轮机有限公司、湖北省标准化与质量研究院、广东省科学院新材料研究所、纳狮新材料股份有限公司
Drafting Persons:
张松、王伟、陈亚平、巩秀芳、钱绪琴、宋冬梅、易娟、袁安素、董雪、李丹、李婳婧、赵利、曹一莹
Replace the following standards
Referenced Standards
GB/T 5206-2015 Paints and varnishes—Terms and definitions
GB/T 5206.1-1985 Paints and varnishes—Vocabulary—Part 1:General terms
GB/T 5206.2-1986 Paints and varnishes—Vocabulary—Part 2:Terminology of resins
GB/T 5206.3-1986 Paints and varnishes—Vocabulary—Part 3:Pigment terms
GB/T 5206.4-1989 Paints and varnishes—Vocabulary—Part 4:Terminology relating to physical and chemical properties of coatings and films
GB/T 5206.5-1991 Paints and varnishes—Vocabulary—Part 5:Terminology relating to defects of coatings and films
GB/T 12334-2001 Metallic and other inorganic coatings—Definitions and conventions concerning the measurement of thickness
ISO/IEC Guide 98-3
Adopt standards
ISO 2360:2017
Related Standards
GB/T 6463-1986
Replaced
GB/T 6463-1986 Metallic and other non-organic coatings—Review of methods of measurement of thickness
GB/T 6465-1986
Replaced
GB/T 6465-1986 Metallic and other non-organic coatings—Corrodkote corrosion test(CORR test)
GB/T 6466-1986
Replaced
GB/T 6466-1986 Electrodeposited chromium coatings—Electrolytic corrosion testing (EC test)
GB/T 6808-1986
Abolished
GB/T 6808-1986 Anodizing of aluminium and its alloys—Accelerated test of light fastness of coloured anodic oxide coatings using artificial light
GB/T 8013-1987
Replaced