摘要
研究了硫酸盐-柠檬酸盐体系电沉积锌锰合金的镀液组分及工艺条件,讨论了主盐浓度、络合剂浓度、电流密度及pH等对合金镀层中锰含量的影响。实验结果表明,最优镀液组分及工艺条件下可以得到锰含量为60％左右的缎面Zn-Mn合金镀层,电流效率达50％。添加剂Na2S2O3不仅能提高锰含量,而且可以显著提高阴极电流效率。阴极极化曲线表明,添加50 mg／L Na2S2O3使阴极析氢电位负移了100 mV,从而抑制了析氢副反应。5％NaCl溶液浸泡实验表明,锌锰合金镀层的耐蚀性随锰含量的增加而增加,6μm厚含锰量64．17％的缎面镀层生红绣时间可达1350 h以上。
The optimum bath components and operation conditions of electrodepositing Zn-Mn alloy from a sulfate-citrate bath＇ were studied. The influences of concentration of main salts and complexing agent, current density and pH on manganese content of alloy coatings were discussed. The experiment results show that the satin Zn-Mn alloy coatings, which contain about 60% manganese, are obtained from the optimal bath with a current efficiency up to 50%. Additive Na2 S2 O3 can not only increase the manganese content but also increase cathodic current efficiency remarkably. The cathode polarization curves show that when 50 mg/L Na2S2O3 are added to the bath, the hydrogen evolution potential will become about 100 mV more negative. As a result, the evolution of hydrogen in the bath of 5 % NaCl solution immersion experiments show that the corrosion resistance of the alloy coatings is enhanced with increasing manganese content, and the red rust time of the satin alloy coatings of 6μm thickness containing 64.17% manganese ＇is over 1350 h.
出处
《电镀与涂饰》
CAS
CSCD
2006年第9期8-12,共5页
Electroplating & Finishing
关键词
电沉积
锌锰合金
耐蚀性
电流效率
锰含量
electrodeposition
Zn-Mn alloy
corrosion resistance
current efficiency
manganese content
