钽、铌及其合金具有很好的延性。磨制金相试样时微细磨痕难以去除且易变形产生冷作硬化层,影响真实组织的显示。为了得到光滑、平整、无冷作硬化层的金相磨面,曾做了许多研究工作。W.D.Forgeng研究了钽、铌的机械-化学抛光法、腐蚀抛光法及电解抛光法。GEORG、BLANN介绍了铌的电解-机械抛光法。近几年用高氯酸镁-甲醇低温电解液抛 Tantalum, niobium and their alloys have good ductility. When grinding the metallographic sample, it is difficult to remove the fine grinding marks and easily deform to produce the cold-hardening layer, which affects the real-tissue display. In order to get a smooth, smooth, cold-hardened layer metallographic surface finish, has done a lot of research work. W. D. Forgng studied tantalum, niobium mechanical - chemical polishing, etching and polishing method and electrolytic polishing method. GEORG, BLANN introduced niobium electrolysis - mechanical polishing method. In recent years with magnesium perchlorate - methanol low temperature electrolyte throw