Parts with titanium and its alloys are becoming increasingly important in the aerospace industry, and they are usually prepared by electrochemical machining. So their special characters, the passivating film and some corrosive pittings, are becoming widely noticeable in electrochemical machining process. The passivating film tends to form on the machining surface, which makes the machining difficult to proceed, and some corrosive pittings usually appear on the non-machined surface lead to the poo...