摘要
锌镍合金是目前最理想的代镉镀层,而碱性锌镍合金电镀体系则以其分散能力强、成本低等优点受到关注。以三乙醇胺或三乙烯四胺作为配位剂研究了锌镍合金的碱性电镀工艺,采用赫尔槽试验、重量及分光光度测定等方法讨论了镀液组成、配位剂添加量、电流密度、温度等因素对镀层外观及镀层镍含量的影响。结果表明:镀液中[Ni2+]/[Zn2+]浓度比、配位剂用量等对镀液稳定性、镀层质量及镍含量有较大的影响;在较宽的电流密度范围内获得光亮耐蚀合金镀层的最优工艺参数为[Ni2+]/[Zn2+]浓度比0.29,三乙醇胺或三乙烯四胺的最佳添加量50mL/L(或30mL/L),镀液温度30～60℃;锌镍合金镀层在5%NaCl溶液中的腐蚀行为表明,含镍量为13%的锌镍合金镀层的耐蚀性明显优于纯锌镀层。
With a view to the advantages of electroplated zincnickel alloy coating as the ideal substitution of Cd plating and to the increased attention on alkaline bath of good dispersion ability and low cost, the ZnNi alloy electroplating technology in an alkaline bath was studied using triethanolamine or triethylenetetramine as the complexing agent. The effects of the bath composition, complexing agent content, current density, and temperature on the appearance and Ni content in the plating were investigated making use of Hull cell test, weight method, and spectrophotometry. The results revealed that the Zn^(2+)/Ni^(2+) ratio and concentration of the complexing agent in the bath had significant influences on the bath stability and the quality and Ni content of the coating. The optimal process parameters for the deposition of the bright (ZnNi) alloy coating were determined to be Zn^(2+)/Ni^(2+) ratio 0.29, concentration of triethanolamine 50 mL/L (or triethylenetetramine 30 mL/L), and bath temperature 30~60 ℃. The target coating deposited at the optimized process parameters had good corrosion resistance in a wide range of current density, and the (ZnNi) alloy plating containing 13wt%Ni had much better corrosion resistance than pure zinc coating.
出处
《材料保护》
CAS
CSCD
北大核心
2005年第4期48-50,61,共4页
Materials Protection
关键词
锌镍合金
电镀
碱性体系
配位剂
Zn-Ni alloy
electroplating
alkaline system
complexing agent
