GB/T 4955-1997 in English

《GB/T 4955-1997金属覆盖层 覆盖层厚度测量 阳极溶解库仑法》由TC57（全国金属与非金属覆盖层标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了测量单层和多层金属覆盖层厚度的阳极溶解库仑法。表1列举了典型的金属覆盖层和基体的组合。用现行的电解液(见附录B)测试其他组合，或为其他组合开发的新电解液而对其进行测试，都必需验证对整个体系的适应性。本方法适用于测量各种方法得到的覆盖层厚度，包括测量多层体系，如Cu/Ni/Cr（见8.6)，以及合金覆盖层和合金化的扩散层的厚度。本方法不仅可测量平面试样的覆盖层厚度，而且可测量圆柱形和线材的覆盖层厚度。

Scope

This standard specifies the anodic dissolution coulometric method for measuring the thickness of single and multilayer metallic coatings. Table 1 lists typical metal cover and substrate combinations. Testing other combinations with current electrolytes (see Appendix B), or testing new electrolytes developed for other combinations, must demonstrate suitability for the overall system. This method is suitable for measuring the thickness of coatings obtained by various methods, including the measurement of multilayer systems, such as Cu/Ni/Cr (see 8.6), and the thickness of alloyed coatings and alloyed diffusion layers. This method can not only measure the coating thickness of plane samples, but also measure the coating thickness of cylindrical and wire rods.