水中钛合金电火花加工的辅助电流抑制杂散腐蚀研究  

Stray Corrosion Restrain of EDM of Titanium Alloy Machined in Water Using Auxiliary Electric Current

作　　者：王祥志[1] 刘志东[1] 魏铮[1] 田宗军[1] 黄因慧[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《南京航空航天大学学报》2014年第5期793-798,共6页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金(51175256;51205197)资助项目;江苏省自然科学基金(BK2011732)资助项目

摘　　要：提出了水中钛合金电火花加工辅助电流抑制杂散腐蚀的加工方法,利用辅助电源施加阴极电流的方式使金属界面呈负电性并达到足够负的电极电位以抑制杂散腐蚀的发生。研究了杂散腐蚀的产生机理和辅助电流对杂散腐蚀的抑制机理,对添加辅助电流前后钛合金表面进行了电场仿真分析、实验验证、表面形貌及组份分析。结果表明:采用辅助电流的方式能有效地消除水中钛合金电火花加工中存在的杂散腐蚀。A method of using auxiliary electric current to restrain the stray corrosion of EDM of titanium alloy machined in water is proposed.In the method,an auxiliary power supply is used to provide enough cathode current to make the metal interface electronegative,as a result of which,the stray corrosion is inhibited.The mechanism of stray corrosion and how to restrain it by auxiliary electric current are studied.The surfaces of titanium alloy machined before and after adopting auxiliary electric current are tested by several means,such as electric field simulation analysis,electrical discharge machining tests,surface morphology and component analysis,and so on.The experimental results show that the auxiliary electric current can efficiently eliminate the stray corrosion of EDM of titanium alloy machined in water.

关 键 词：电火花加工 钛合金 辅助电流 杂散腐蚀 

分 类 号：TG662[金属学及工艺—金属切削加工及机床]