非磁性导电基体上非导体覆盖层.镀层厚度的测量.振幅灵敏性涡流法

[中文适用范围]： 本文件规定了一种使用振幅敏感涡流仪器对非磁性导电基体金属上的非导电涂层厚度进行无损测量的方法。在本文件中，术语“涂层”用于诸如油漆和清漆、电镀涂层、搪瓷涂层、塑料涂层、包层和粉末涂层等材料。该方法特别适用于测量阳极氧化产生的大多数氧化物涂层的厚度，但不适用于所有转化涂层，其中一些转化涂层太薄而无法通过该方法测量（见第 6 条）。该方法还可用于测量非导电基体材料上的非磁性金属涂层。但是，ISO 21968 中规定的相位敏感涡流法特别适用于此应用，并且可以提供更高精度的厚度结果（见附件 A）。该方法不适用于测量导电基体金属上的非磁性金属涂层。 ISO 21968 中规定的相位敏感涡流法特别适用于此应用。然而，在非常薄的涂层和非常小的电导率的特殊情况下，振幅敏感涡流法也可用于此应用（见附件 A）。虽然该方法可用于测量磁性基底金属上涂层的厚度，但不建议将其用于此应用。在这种情况下，规定的磁性方法 [外文原描述]： ISO 2360:2017 specifies a method for non-destructive measurements of the thickness of non-conductive coatings on non-magnetic electrically conductive base metals, using amplitude-sensitive eddy-current instruments. In ISO 2360:2017, 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 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 6). This method can also be used to measure non-magnetic metallic coatings on non-conductive base materials. However, the phase-sensitive eddy-current method specified in ISO 21968 is particularly usable to this application and can provide thickness results with a higher accuracy (see Annex A). This method is not applicable to measure non-magnetic metallic coatings on conductive base metals. The phase-sensitive eddy-current method specified in ISO 21968 is particularly useful for this application. However, in the special case of very thin coatings with a very small conductivity, the amplitude-sensitive eddy-current method can also be used for this application (see Annex A). Although the method can be used for measurements of the thickness of coatings on magnetic base metals, its use for this application is not recommended. In such cases, the magnetic method specified in ISO 2178 can be used. Only in case of very thick coatings above approximately 1 mm, the amplitude-sensitive eddy-current method can also be used for this application (see Annex A).