標準號：BS EN ISO 15721-2001
中文標準名稱：金屬覆層.孔隙率試驗.用亞硫酸和二氧化硫蒸汽對金和鈀涂層孔隙率的測定
英文標準名稱：Metallic coatings - Porosity tests - Porosity in gold or palladium coatings by sulfurous acid/sulfur dioxide vapour
標準類型：A29
發(fā)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 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