钛合金电解加工点蚀机理研究进展

Research progress on pitting mechanism for electrochemical machining of titanium alloys

电解加工是一种很好的加工钛合金的方式,不但加工效率高,还可用于加工薄壁和异型构件,优势十分显著。然而,在低电流的电解加工过程中,钝化膜的自钝化和形成的点蚀不但会影响工件表面的粗糙度,而且也会影响非加工部位,因此有必要研究清楚钛合金点蚀的成因、发展过程和控制方法。详细综述了外加电压条件下钛合金点蚀发展的过程、机理和抑制点蚀的方法,同时阐释了相关抑制点蚀方式的优劣,展望了未来电解加工中抑制钛合金点蚀方法的发展趋势和研究方向。

Electrochemical machining is usually used to shape titanium and titanium alloys because it has high efficiency and great capability to manufacture thin-walled and special-shaped components.However,the passive film and formation of pitting corrosion on both workpiece surface and the non-machined part are the main drawbacks when the machining uses low working electric currents.Therefore,research on pits initiation,pits growth and pits control during electrochemical machining is in great need.This paper reviews the research progress on cause,prevention,and control of pitting corrosion of titanium alloys during electrochemical machining.Meanwhile,the advantages and weaknesses of each strategy are well illustrated.The research trend in pitting corrosion for electrochemical machining of titanium is also presented.