本国际标准规定了使用硝酸蒸汽测定土壤孔隙度的设备和方法 金镀层，尤其是电触点上使用的电镀层和覆层金属。 该方法旨在显示孔隙度水平是否小于或大于某个值 用户认为预期应用可接受的经验。 它适用于含金75%或以上的嵌体或覆层，以及含金95%或以上的电镀层 金或铜、镍及其合金的基底，通常用于电触点。 硝酸蒸汽试验过于严格，不能用于厚度小于0.6μm的金涂层。它也不适用于 低于金或铂的镀层，如钯及其合金，或闪金钯和铂 它的合金。 ISO 10308和文献中描述了几种其他孔隙度测试方法（参见参考文献[1] [2]）。

This International Standard specifies equipment and a method for using nitric acid vapour to determine porosity in gold coatings, particularly electrodeposits and clad metals used on electrical contacts. This method is designed to show whether the porosity level is less than or greater than some value that, by experience, is considered by the user to be acceptable for the intended application. It is suitable for inlays or claddings containing 75 % or more of gold, for electrodeposits containing 95 % or more of gold or for substrates of copper, nickel and their alloys that are commonly used in electrical contacts. The nitric acid vapour test is too severe to be used for gold coatings less than 0,6 _m thick. It is also not suitable for coatings that are less noble than gold or platinum, such as palladium and its alloys, or gold-flashed palladium and its alloys. Several other porosity testing methods are described in ISO 10308 and in the literature (see e.g. Bibliography, [1] and [2]).