金属覆盖层 金属基体上金镀层孔隙率的测定 硝酸蒸气法

[中文适用范围]： 本国际标准规定了使用硝酸蒸汽测定金镀层孔隙率的设备和方法，特别是电沉积物和电触点上使用的复合金属。 该方法旨在显示孔隙率水平是否小于或大于用户根据经验认为对于预期应用可接受的某个值。 它适用于含金量 75% 或以上的镶嵌物或镀层、含金量 95% 或以上的电沉积物或电接触中常用的铜、镍及其合金基材。 硝酸蒸气测试过于严格，不适用于厚度小于 0.6 μm 的金涂层。 它也不适合比金或铂贵重的涂层，例如钯及其合金，或闪金钯及其合金。 ISO 10308 和文献中描述了其他几种孔隙率测试方法（参见参考书目，[1] 和 [2]）。 [外文原描述]： 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]).