硫酸盐-柠檬酸盐体系锌锰合金电镀液稳定性的研究

Studies on the stability of zinc-manganese alloy plating bath containing sulfate and citrate ions

锌锰合金镀液存在电流效率低、镀液稳定性差等缺点。选择硫酸盐 -柠檬酸盐体系锌锰合金镀液 ,研究了阳极、二价锰离子以及连续作用等因素对镀液稳定性的影响。结果表明 :采用不锈钢阳极和阴离子膜可提高镀液稳定性 ,防止二价锰被氧化 ,加入氢氧化钡可消除因补充锌锰离子而积累的硫酸根离子。

Zinc-manganese alloy electroplating has weaknesses such as low current efficiency and poor bath stability. Herein, zinc-manganese alloy bath containing sulfate and citrate ions was selected, and the effect of anodes, manganous ions and continuous operation on bath stability was studied. Results show that the adoption of stainless steel anode wrapped with anion membrane improves the bath stability and avoids the oxidation of manganous ions. Moreover, the addition of barium hydroxide can remove the excessive sulfate ions caused by the replenishment of zinc and manganous ions.