本文件规定了测定铝及其合金阳极氧化涂层单位面积质量（表面密度）的重量法。 该方法适用于铝及其合金（铸造或锻造）阳极氧化形成的所有氧化膜，适用于大多数铝合金，铜质量分数大于6%的除外。 注1:合金中铜含量高会导致基体铝的溶解增加。 注2:如果已知的厚度具有足够的精度（例如，使用ISO 2128中规定的方法），则测定涂层的单位面积质量（表面密度）将能够计算其表观密度。相反，如果涂层的应用条件及其密度已知，则确定其单位面积质量（表面密度）可允许计算平均质量和近似评估厚度（见第9条）。

This document specifies a gravimetric method for determining the mass per unit area (surface density) of anodic oxidation coatings on aluminium and its alloys. The method is applicable to all oxidation coatings formed by anodizing aluminium and its alloys, either cast or wrought, and is suitable for most aluminium alloys, except those in which the mass fraction of copper is greater than 6 %. NOTE 1 A high content of copper in the alloy can lead to increased dissolution of the substrate aluminium. NOTE 2 If the thickness is known with sufficient precision (for example, using the method specified in ISO 2128), the determination of the mass per unit area (surface density) of the coatings will enable its apparent density to be calculated. Conversely, if the conditions of application of the coating and its density are known, the determination of its mass per unit area (surface density) can permit the calculation of the average mass and an approximate evaluation of the thickness (see Clause 9).