酸性硫酸盐电解液中沉积Ni-W合金的动力学
Kinetics of Ni-W Alloy Electro-deposition in Acidic Sulphate Electrolyte
摘 要
在酸性硫酸盐镀液中,采用循环伏安曲线和计时安培曲线等电化学方法结合Scharifker-Hills模型对Ni-W合金镀层的沉积过程进行了动力学研究。结果表明,Ni-W合金循环伏安曲线存在电流环,在玻碳电极上发生成核过程; 电解液中WO42-浓度增加会促进镀层晶体形核过程。Scharifker-Hills模型分析结果表明,纯镍在玻碳电极上表现为三维生长的瞬时成核机理。在电解液中加入WO42-进行Ni-W合金共沉积时,在较小的过电位下表现为连续形核机制,在较大的过电位下与连续形核曲线略有偏离,表现为连续形核和瞬时形核共存的形核机制。
电沉积
循环伏安曲线
计时安培法
Scharifker-Hills模型
nickel-tungsten alloy
electro-deposition
cyclic voltammetry curve
chronoamperometry
Scharifker-Hills model
Abstract
Cyclic voltammetry curves (CV) and chronoamperometry(CA) in conjunction with the Scharifker-Hills model (SH) were used to study the initial stage of Ni-W alloy electro-deposition. The results indicated that the electro-deposition of the Ni-W alloy on glassy carbon electrode consisted of nucleation and growth. The crystal nucleation of plating improved as the concentration of WO42- increased and its reduction intermediate products could be considered as favorable sites of the Ni-W alloy. According to the analysis of Scharifker-Hills model, the pure Ni nucleation process follows a three dimension-instantaneous mechanism, while the Ni-W alloy is a progressive nucleation mechanism at a lower over-potential, which slightly deviats from the progressive nucleation curve at higher over-potential and shows a instantaneous nucleation mechanism.
中图分类号 TG174
所属栏目 试验研究
基金项目 国家自然科学基金(50571059; 50615024); 汽车用钢开发与应用技术国家重点实验室(宝钢)开放课题; 教育部创新团队计划(IRT0739)
收稿日期 2013/2/28
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备注钟庆东(1969-),教授,博士,从事材料腐蚀电化学研究,
引用该论文: LIU Hui-juan,ZHANG Ping,ZHOU Qiong-yu,LI Ke,ZHONG Qing-dong. Kinetics of Ni-W Alloy Electro-deposition in Acidic Sulphate Electrolyte[J]. Corrosion & Protection, 2013, 34(12): 1062
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【9】SCHUH C A,NIEH T G,IWASAKI H. The effect of solid solution W additions on the mechanical properties of nanocrystalline Ni[J]. Acta Materialia,2003,51(2):431-443.
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【14】ABDEL H Z. Electrodeposition of cobalt-tungsten alloys from acidic bath containing cationic surfactants[J]. Materials Letters,2003,57(16/17):2558-2564.
【15】李振良,杨防祖,姚士冰,等. 镍钨合金电结晶机理[J]. 厦门大学学报:自然科学版,1999,38(2):230-233.
【16】YOUNES M O,ZHU L,GILEADI E. The anomalous codeposition of tungsten in the presence of nickel[J]. Electrochimica Acta,2003,48(18):2551-2562.
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