以硼氢化钠为还原剂化学镀镍的电化学研究.pdf

物理化学学报( Wuli Huaxue Xuebao
March
Acta Phys.-Chim.Sin.2011227(3),633-640
63
Articlel
www.whxb.pku.edu.cn
以硼氢化钠为还原剂化学镀镍的电化学研究
贾飞王周成¨
(厦门大学化学化工学院,化学工程与生物工程系,福建厦门361005
摘要:采用线性电位扫描伏安法研究了以硼氢化钠为还原剂的化学镀線体系,考査了镀液组成及工艺条件对
化学镀镍硼阴、阳极过程的影响,结果表明:乙酸镍和硼氢化钠含量的提高分别促进了Ni2'的还原反应和BHL的
氧化反应;乙二胺、気氧化钠以及添加剂疏脲、糖精钠对阴、阳极反应均有不同程度的抑制作用,同时添加剂中
的硫元素加速了镍的氧化;升高温度有利于阴、阳极反应的进行
关键词:化学镀镍;阴极还原;阳极氧化;极化;添加剂;吸附
中图分类号』O646
Electrochemical Study on Electroless Nickel Plating Using Sodium
Borohydride as the Reductant
JIA Fei WANG Zhou-chen
(Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University
Xiamen 361005, Fujian Province, P R. China
Abstract: We studied electroless NI-B plating with sodium borohydride as the reductant by linear
sweep voltammetry. The effects of bath solution composition and operating conditions on the cathodic
reduction and anodic oxidation were studied. Increases in the concentrations of nickel acetate and sodium
borohydride accelerated the reduction of N"and the oxidation of BH, respectively. Ethylenediamine,
sodium hydroxide, thiourea and saccharin sodium inhibited both the cathodic and anodic reactions to
varying de. Adi ionally, sulfur in the additives promoted the dissolution of nickel High temperature
was beneficial to both the cathodic reduction and anodic oxidation
Key Words: Electroless nickel plating: Cathodic reduction, Anodic oxidation Polarization
Additive Adsorption
高、接触电阻低等优点.以硼氢化物为还原剂的强
镁合金具有重量轻、密度小、吸震性能高、比强碱性镀液可以有效地减缓镁合金的腐蚀,提高镀层
度和比刚度大等诸多优良特性,3可以广泛应用于与基体的结合力;锼液中避免使用氟离子,减少了
汽车工业、航空工业、3C产品等领域,但镁合金耐对环境和人体的危害,便于实验室操作以及工业应
蚀性差的缺陷严重限制了其潜力的发挥.化学镀镍用;并且硼氢化物分子量小,直接氧化反应为八电
可以显著提高镁合金耐蚀性,镀液的还原剂主要为子过程,还原当量远大于次磷酸钠.因此,使用硼
次磷酸盐、硼氢化物和二甲基硼烷相对于以次磷氢化物为还原剂的化学镀镍倗是一种经济有效的镁
酸钠为还原剂获得的镍磷镀层,镍硼镀层具有硬度合金表面处理技术.
Received: September 23, 2010; Revised November 25, 2010; Published on Web: January 18, 2011
Correspondingauthor.Email:zcwang(@xmu.edu.cn;Tel:+86-592-2180738
The project was supported by the National Natural Science Foundation of China(20573086)
国家自然科学基金(20573086)资助项目
C Editorial office of Acta Physico-chimica Sinica