铝和铝合金的阳极氧化.用导纳测量法评定阳极氧化膜的封孔质量

[中文适用范围]： 本文件规定了通过测量导纳来评估铝及其合金密封阳极氧化涂层质量的方法。 该方法适用于水介质中密封的阳极氧化涂层。 注1：采用不同方法密封的阳极氧化涂层（例如水热密封和冷密封）获得的结果不一定具有可比性。 注 2：从含有超过 2% 硅或 5% 锰或 3% 镁的合金上阳极氧化涂层获得的结果与从更稀合金上阳极氧化涂层获得的结果不可比较。 该方法适合用作生产控制测试以及阳极氧化厂和客户之间达成协议的验收测试。 任何类型的阳极氧化部件都可以通过所述方法进行测试，只要有足够的面积（直径约20毫米的圆）并且膜厚度大于3微米。 [外文原描述]： 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.