电加工与模具
電加工與模具
전가공여모구
ELECTROMACHINING & MOULD
2015年
4期
32-34,47
,共4页
电解加工%多孔表面%直流%直流脉冲
電解加工%多孔錶麵%直流%直流脈遲
전해가공%다공표면%직류%직류맥충
electrochemical machining%porous surface%DC%DC pulse
采用直流和脉冲电源电解加工不锈钢多孔表面，研究两种极化条件下的材料溶解过程及表面孔洞生长规律。结果发现：直流电解加工的材料溶解主要受浓差极化的控制，而脉冲电解加工的材料溶解主要受电化学极化的控制；直流电解加工孔洞的生长速度更快、表面腐蚀率更高，但孔洞数量少且均匀性差；而脉冲电源能增强电化学极化、抑制浓差极化，使孔洞的成核速度大于其生长速度，所以孔洞数量更多、均匀性更好，但加工效率比直流略低。
採用直流和脈遲電源電解加工不鏽鋼多孔錶麵，研究兩種極化條件下的材料溶解過程及錶麵孔洞生長規律。結果髮現：直流電解加工的材料溶解主要受濃差極化的控製，而脈遲電解加工的材料溶解主要受電化學極化的控製；直流電解加工孔洞的生長速度更快、錶麵腐蝕率更高，但孔洞數量少且均勻性差；而脈遲電源能增彊電化學極化、抑製濃差極化，使孔洞的成覈速度大于其生長速度，所以孔洞數量更多、均勻性更好，但加工效率比直流略低。
채용직류화맥충전원전해가공불수강다공표면，연구량충겁화조건하적재료용해과정급표면공동생장규률。결과발현：직류전해가공적재료용해주요수농차겁화적공제，이맥충전해가공적재료용해주요수전화학겁화적공제；직류전해가공공동적생장속도경쾌、표면부식솔경고，단공동수량소차균균성차；이맥충전원능증강전화학겁화、억제농차겁화，사공동적성핵속도대우기생장속도，소이공동수량경다、균균성경호，단가공효솔비직류략저。
Porous surfaces were prepared by DC and DC pulse electrochemical machining on the surface of stainless steel,and material dissolution and holes growth characteristics were investigated. The results show that material dissolution is mainly controlled by the concentration polarization with the DC power supply,while it is under control of electrochemical polarization by DC pulse electrochemical machining. DC electrochemical machining makes the holes grow faster and the surface corrosion rate is higher,but the surface has small number holes and is poor uniformity. The pulse power supply can enhance the electrochemical polarization and reduce the concentration polarization ,which can promote pores formation and combat their growth. Therefore the holes number is larger and more homogeneous , but the processing efficiency is slightly lower.
