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.

Titanium  /  electrochemical machining  /  pitting corrosion  /  suppression method