ISO 2931:2017规定了通过测量导纳评估铝及其合金上密封阳极氧化涂层质量的方法。 该方法适用于在水介质中密封的阳极氧化涂层。 注1:通过不同方法（例如水热密封和冷密封）密封的阳极氧化涂层获得的结果不一定具有可比性。 注2:硅含量超过2%、锰含量超过5%、镁含量超过3%的合金阳极氧化涂层的结果与更稀合金阳极氧化涂层的结果不可比。 该方法适用于生产控制试验和阳极氧化厂与客户之间达成一致意见的验收试验。 只要有足够的面积（直径约20 mm的圆）且膜厚度大于3μm，任何类型的阳极氧化组件都可以通过所述方法进行测试。

ISO 2931:2017 specifies a method for assessing the quality of sealed anodic oxidation coatings on aluminium and its alloys by measurement of the admittance. The method is applicable to anodic oxidation coatings sealed in an aqueous medium. NOTE 1 Results obtained from anodic oxidation coatings sealed by different methods, e.g. hydrothermal sealing and cold sealing, are not necessarily comparable. NOTE 2 Results obtained from anodic oxidation coatings on alloys containing more than 2 % silicon or 5 % manganese or 3 % magnesium are not comparable with results obtained from anodic oxidation coatings on more dilute alloys. The method is suitable for use as a production-control test and as an acceptance test where there is agreement between the anodizer and the customer. Any type of anodized component can be tested by the method described, provided that there is a sufficient area (a circle of diameter about 20 mm) and that the film thickness is greater than 3 μm.