酸性滚镀锌工艺的维护

研究了铁杂质对酸性滚镀锌镀液的影响和处理方法。向镀液中加入双氧水0.05mL/L,pH值在4.5～5.3范围内,铁杂质的质量浓度降低10.2～17.3mg/L,且在pH值较低的条件下,处理铁杂质的效果较好。制定了宽温酸性滚镀锌工艺:氯化锌45～55g/L,氯化钾200～230g/L,硼酸30～35g/L,401主光剂1mL/L,401辅光剂30mL/L,pH值4.5～5.5,5.5～6.5V,15～45℃,40～120min。

Maintenance of Acidic Zinc Barrel Plating Process

The effects of iron impurity on acidic zinc barrel plating bath and methods for treating iron impurity were studied.When 0.05 mL/L hydrogen peroxide was added to the plating bath,the mass concentration of the iron impurity decreased 10.2~17.3 mg/L in pH range from 4.5 to 5.3,and the treatment result was better when pH was lower.A wide temperature range acidic barrel zinc plating process was made: zinc chloride 45~55 g/L,potassium chloride 200~230 g/L,boric acid 30~35 g/L,401 main brightener 1 mL/L,401 accessorial brightener 30 mL/L,pH value 4.5~5.5,voltage 5.5~6.5 V,temperature 15~45 °C,processing time 40~120 min.