金属和非金属基材上的非磁性金属涂层 - 涂层厚度测量 - 相敏涡流法

[中文适用范围]： 本文件规定了一种使用相敏涡流仪器对金属和非金属基础材料上的非磁性金属涂层厚度进行无损测量的方法，例如：a)钢上的锌、镉、铜、锡或铬；b)复合材料上的铜或银。与ISO 2360中规定的振幅敏感涡流法相比，相敏法可应用于较小的表面积和较大的表面曲率，而不会产生厚度误差，并且受基础材料磁性的影响较小。然而，相敏法受涂层材料电性质的影响更大。在本文件中，术语“涂层”用于例如油漆和清漆、电镀涂层、搪瓷涂层、塑料涂层、覆层和粉末涂层等材料。该方法特别适用于测量金属涂层的厚度。这些涂层可以是非导电、导电或磁性基材上的非磁性金属涂层，也可以是非导电或导电基材上的磁性涂层。只有当一种材料的电导率与磁导率的乘积 (σ、μ) 至少是另一种材料的电导率与磁导率乘积的两倍时，才能测量金属基材上的金属涂层。非铁磁性材料的相对磁导率为 1。 [外文原描述]： This document specifies a method for 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 specified in ISO 2360, 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. In this document, the term "coating" is used for materials such as, for example, paints and varnishes, electroplated coatings, enamel coatings, plastic coatings, claddings and powder coatings. This method is particularly applicable to measurements of the thickness of metallic coatings. These coatings can be non-magnetic metallic coatings on non-conductive, conductive or magnetic base materials, but also magnetic coatings on non-conductive or conductive base materials. The measurement of metallic coatings on metallic basis material works only when the product of conductivity and permeability ( σ , μ ) of one of the materials is at least a factor of two times the product of conductivity and permeability for the other material. Non-ferromagnetic materials have a relative permeability of one.