ISO 21968:2005 金属的和非金属基础材料用非磁性金属涂料 涂料厚度测量 状态-敏感逆流法

标准编号：ISO 21968:2005

中文名称：金属的和非金属基础材料用非磁性金属涂料 涂料厚度测量 状态-敏感逆流法

英文名称：Non-magnetic metallic coatings on metallic and non-metallic basis materials — Measurement of coating thickness — Phase-sensitive eddy-current method

发布日期：2005-07

标准范围

This International Standard describes a method of using phase-sensitive eddy-current instruments for non-destructive measurements of the thickness of non-magnetic metallic coatings on metallic and non-metallic basis materials, such as:a) zinc, cadmium, copper, tin or chromium on steel;b) copper or silver on composite materials.The phase-sensitive method can be applied without thickness errors to smaller surface areas and to stronger surface curvatures than the amplitude-sensitive eddy-current method described in ISO 2360[1], and is less affected by the magnetic properties of the basis material. However, the phase-sensitive method is more affected by the electrical properties of the coating materials.When measuring metallic coatings on metallic basis materials, the product of conductivity and permeability (σ, μ) of one of the materials should be at least a factor of 1,5 times the product of conductivity and permeability for the other material. Non-ferromagnetic materials have a relative permeability of 1.

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