標準號：BS EN ISO 15720-2001
中文標準名稱：金屬覆層.孔隙率試驗.凝膠材料電譜法測定金屬基體上金或鈀涂層的孔隙率
英文標準名稱：Metallic coatings - Porosity tests - Porosity in gold or palladium coatings on metal substrates by gel-bulk electrography
標準類型：A29
發布日期：2001/7/15 12:00:00
實施日期：2001/7/15 12:00:00
中國標準分類號：A29
國際標準分類號：25.220.40
適用范圍：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