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本文作者对点蚀临界击破电位作了严格的热力学定义,首先提出一个点蚀核产生过程的模型,继而推导出点蚀临界击破电位(ρ_b)与活性阴离子活度(α_x-)的对数成线性关系,并确定了ρ_b、α_x-,o及点蚀临界温度(T_o)之间的对应关系;然后,建立起点蚀核产生过程的动力学方程式,推得了不同恒定电位条件下点蚀诱导时间(τ)与α_x-之间的几种函数关系,许多作者的实验结果由此得到合理的解释;最后,提出了实测点蚀临界击破电位的可行方法.
The author has made a strict thermodynamic definition of the critical breakdown potential of pitting corrosion. First, a model of pitting nucleus generation process is proposed. Then the logarithm of the critical breakdown potential (ρ_b) and active anion activity (α_x-) of pitting corrosion Then, the corresponding relationship between ρ_b, α_x-, o and the critical temperature of pitting corrosion (T_o) was determined. Then, the kinetic equation of pitting nucleus generation process was established, and the pitting induction time under different constant potentials (τ) and α_x-, the experimental results of many authors can be reasonably explained. Finally, a feasible method of measuring the critical breaking potential of pitting corrosion is proposed.