高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (6): 547.

• 论文 • 上一篇    下一篇

添加剂DB对锌的电化学成核的影响

吴辉煌, 许书楷, 周绍民   

  1. 厦门大学化学系
  • 收稿日期:1986-02-16 出版日期:1987-06-24 发布日期:1987-06-24
  • 基金资助:

    中国科学院科学基金

Effects of the Additive DB on the Electronucleation of Zinc

Wu Huihuang, Xu Shukai, Zhou Shaomin   

  1. Department of Chemistry Xiamen University, Xiamen
  • Received:1986-02-16 Online:1987-06-24 Published:1987-06-24

摘要: 利用微计算机控制的电化学测试系统研究了低脆性镀锌添加剂DB对锌的电化学成核的影响。发现锌晶核的形成遵循连续成核机理。成核速度常数A与电极电位E的关系证明经典成核速度定律适用。饱和晶核数密度Vs和E的关系可经验地表示为Ns=N1-exp[-b(E-Ecr)]。E恒定不变时,A和Ns随DB浓度增大而减小。用异相成核理论解释了添加剂和过电位的不同效应。

Abstract: Using an electrochemical setup controlled by a microcomputer, the influence of DB, an additive for forming Zn deposits with low brittleness, on the electronu-cleation of zinc was investigated. The results showed that the nucleation follows the progressive mechanism. The relation of the nucleation rate constants Ato the electrode potentials Eprovided the evidence of the validity of the classical nucle-ation-rate law, and the emprical equation Ns=N{1-exp[-b(E-Ecr)]}was obtained after fitting the saturated nuclear number densities Nswith E. At a constant potential, however, both Nsand Adecreased with increasing DBconcentrations. The effects of the additive and ovcrpotential were discussed in terms of heterogeneous nucleation theory.

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