环保型铜件光亮浸蚀新工艺

Novel environmentally friendly bright dipping process for copper parts

以H2SO4 900 g/L、Na NO3 100 g/L和Na Cl 1 g/L体系为基础,通过添加整平缓蚀剂和黄烟（NO2）抑制剂,得到了一种操作简单、无黄烟、对基材低腐蚀的铜及铜合金光亮浸蚀新工艺。经过铜片出光效果及黄烟抑制试验,确定聚乙二醇为缓蚀剂、尿素为黄烟抑制剂,用量依次为3~5 g/L和5~10 g/L。研究表明,新工艺中氮氧化物释放量约为旧工艺的22.4%,浸蚀时间在10~120 s、空中停留60 s对试片外观无影响。该工艺适用于自动生产线操作。

A novel bright pickling process for copper and copper alloys characterized by easy operation, yellow smoke-free, and low corrosion to the substrate was obtained by adding leveling corrosion inhibitor and yellow smoke（NO2） inhibitor to a bath containing 900 g/L H2SO4, 100 g/L Na NO3, and 1 g/L Na Cl. The polyethylene glycol was determined as corrosion inhibitor and urea as yellow smoke inhibitor through copper sheet bright dipping test and yellow smoke inhibition test. The dosage is 3-5 g/L for polyethylene glycol and 5-10 g/L for urea. It was found that the novel process reduces the release of nitrogen oxides by about 22.4% as compared with the previous one. The appearance of test coupon is slightly affected when pickling by the process for 10-120 s and staying in air for 60 s thereafter. The process is suitable for automatic production line.