熔盐电镀.I.电化学成核及其在离子扩散控制下的长大

Electroplating from Molten Salts Part Ⅰ. Electrochemical Nucleation with Diffusion Controlled Growth

  • 摘要: 研究电化学成核和长大可为熔盐电镀找到一些控制镀层质量的方法,对熔盐电镀很重要。电化学成核和长大是通过电化学反应生成新相的过程,其基本关系过去都是从气—液相变和液—固相变的关系导出的。本文利用两个带电的简单相之间的平衡条件——电化学势相等,导出了电化学成核和长大的基本热力学关系和晶核密度(或成核速度)公式。本文还利用溶液中离子的半球形扩散方程,并考虑成核和长大的特点,导出了恒电势下半球形晶核形成和长大的暂态极化公式。推导过程比过去更加直接明瞭,所得的一些关系比经典理论更加普遍,因而更易于理解。

     

    Abstract: Some methods for controlling the quality of electroplates can be found out by making study on electrochemical nucleation and growth,which are of importance for electroplating from molten salts
    The basic relations between electrochmical nucleation and growth used to be derived from those of gas-Liquid ani liquid-solid phase transformations. In this paper, the thermodynamic relations between electrochemical nucleation and growth arc derived using the general condition of equilibrium between two simple charged phaser,i. e. the electrochemical potentials between themare eqtat to each other, and a equation of nuelous density is got based on statistic theorv. Potentiostatie traasients for hemispherical nicleation with diffusion coatroiled growth are also developed by making use of hemispherical diffusion equation of ions in solution.

     

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