双层模板电解加工工艺对LY12表面阵列微坑形貌的影响

Influence of Double Mask Electrochemical Machining on Aluminum-Alloy Surface with Micro-dimples Array

针对铝合金(LY12)表面阵列微坑加工精度较低的现状,提出了采用双层模板电解加工铝合金(LY12)表面阵列微坑工艺.该工艺采用高电流密度的方法去除加工过程中的铝合金材料表面的点蚀现象,并使用非线性的硝酸钠溶液减小微坑的侧向腐蚀.通过对电流密度和电解液参数的合理优化,在铝合金工件表面得到形貌一致的阵列微坑.试验结果表明,在双层模板电解加工过程中,采用硝酸钠溶液作为电解液,并选取电流密度为25 A/cm2,可有效减小阵列微坑的侧向腐蚀,提高铝合金表面阵列加工的定域性.

For the status of low precision during micro-pit machining on the aluminum-alloy（LY12） surface, a double mask electrochemical process was proposed. Pitting corrosion on the aluminum-alloy surface could be eliminated with higher current density, and the lateral etching could decrease with NaNO3 solution which can improve the machining dimensional accuracy. Using optimized machining parameters, the uniform micro-dimples array was produced on the aluminum-alloy surface. The experiment results showed that mask electrochemical process with NaNO3 solution and current density of 25 A/cm^2 can decrease the lateral etching and improve machining localization on the aluminum surface.