BS EN ISO 15721-2001 金属覆层.孔隙率试验.用亚硫酸和二氧化硫蒸汽对金和钯涂层孔隙率的测定

标准号：BS EN ISO 15721-2001
中文标准名称：金属覆层.孔隙率试验.用亚硫酸和二氧化硫蒸汽对金和钯涂层孔隙率的测定
英文标准名称：Metallic coatings - Porosity tests - Porosity in gold or palladium coatings by sulfurous acid/sulfur dioxide vapour
标准类型：A29
发布日期：2001/7/15 12:00:00
实施日期：2001/7/15 12:00:00
中国标准分类号：A29
国际标准分类号：25.220.40
适用范围：This test method covers equipment and methods for determining the porosity of gold or palladium coatings, particularly electrodeposits and clad metals used on electrical contacts. It is designed to show whether the porosity level is less than or greater than a given value which by experience is considered by the user to be acceptable for the intended application. This porosity test involves corrosion reactions in which the products delineate defect sites in coatings. Since the chemistry and properties of these products may not resemble those found in natural or service environments this test cannot be recommended for the prediction of the electrical performance of contacts unless correlation is first established with service experience. This test is intended to be used for quantitative descriptions of porosity (such as number of pores per unit area or per contact) on coatings that have a sufficiently low pore density so that the corrosion sites are well separated and can be readily resolved. As a general guideline this can be achieved for pore densities up to about 100/cm