超薄不锈钢基材连续电解抛光工艺的优化

Optimization of continuous electropolishing process for ultrathin stainless steel

从抛光液组分配比、温度、阳极电流密度以及阴阳极材料、保养周期和保养方法 6个方面对0.07 mm厚的超薄不锈钢材料连续电解抛光工艺进行了优化,得到最佳抛光液配方为:浓磷酸700 m L/L,浓硫酸250 m L/L,复合添加剂(含40 m L/L明胶和7.5 mL/L甘油的异丙醇溶液)50 mL/L。最佳操作条件为:阳极电流密度18~50 A/dm^2,温度60~80°C,时间2~3 min,阴阳极间距50 mm,以钛制作的阴极板、辅助阳极导电块、导电轮和导电轮固定杆的保养周期分别为3、48、1 440和3 h。给出了生产过程中常见故障的排除方法。该工艺对超薄不锈钢零件边缘裁切面毛刺及表面的抛光效果完全满足产品质量要求。

The continuous electropolishing for ultrathin stainless steel with a thickness of 0.07 mm was optimized from the aspects of bath composition, temperature, anodic current density, as well as material and maintenance cycle and method of cathode and anode. The optimized electropolishing bath is composed of concentrated phosphoric acid 700 mL/L, concentrated sulfuric acid 250 mL/L, and composite additive （an isopropyl alcohol solution containing 40 mL/L of gelatin and 7.5 mL/L of glycerol） 50 mL/L. The most suitable operating conditions are as follows： anodic current density 18-50 A/dm2, temperature 60-80 ℃, anode-to-cathode distance 50 mm, and reaction time 2-3 min. The cathode plate, conductive block of auxiliary anode, conductive roller and conductive guide rod are recommended to be made of titanium and maintained every 3, 48, 1 440 and 3 hours, respectively. The countermeasures for some common troubles in production process were given. The removal of burrs on cut edge and the surface polishing effect by the process can fully meet the quality requirement of ultrathin stainless steel parts.