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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。
Studying electrochemical nucleation and growth can find some ways to control the coating quality for molten salt plating, which is important for molten salt plating. Electrochemical nucleation and growth are the processes by which a new phase is generated by electrochemical reactions. The basic relationship has been derived from the relationship between gas-liquid phase change and liquid-solid phase transformation in the past. In this paper, the basic thermodynamic relationship between electrochemical nucleation and growth and the formula of nucleation density (or nucleation rate) are deduced by using the equilibrium condition between two charged simple phases - the same electrochemical potential. In this paper, we also use the hemispherical diffusion equation of ions in solution and consider the characteristics of nucleation and growth. The transient polarization equation for the formation and growth of hemispherical nuclei at constant potential is derived. The derivation process is more straightforward than in the past, and some of the resulting relationships are more general than classical theory and therefore easier to understand.