BS EN ISO 15720-2001 金属覆层.孔隙率试验.凝胶材料电谱法测定金属基体上金或钯涂层的孔隙率

标准号：BS EN ISO 15720-2001
中文标准名称：金属覆层.孔隙率试验.凝胶材料电谱法测定金属基体上金或钯涂层的孔隙率
英文标准名称：Metallic coatings - Porosity tests - Porosity in gold or palladium coatings on metal substrates by gel-bulk electrography
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 techniques for determining porosity in noble metal coatings, particularly electrodeposits of gold, palladium and palladium-nickel alloy (70 % to 90 % palladium) and clad metals used on electrical contacts. The gel-bulk procedure is not as sensitive to small pores and is more complex than porosity tests involving gaseous corrodants (see ISO 14647 and ISO 15721). It also involves more chemicals, preparation and auxiliary equipment. This test is intended to be used for quantitative descriptions of porosity (such as number of pores per unit area or per contact) only on measurement areas where coatings have a sufficiently low pore density such 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 25/cm