电沉积镍涂层与铁基底的界面扩散

Interface Diffusion of Electrodeposited Nickel Coating and Substrate Iron

首先假设扩散系数与浓度无关,根据电子探针的实验结果,采用无限大扩散偶模型,使用扩散方程的误差函数解对实验结果进行拟合,获得铁镍的互扩散系数;然后考虑扩散系数与浓度有关的一般情况,与常规的玻耳兹曼 俣野法相区别,采用最小二乘法对实验数据进行拟合处理,得到元素浓度分布的曲线方程,从而求得与浓度有关的互扩散系数.

The concentration curves of iron and nickel interface in the deep drawing steel strip are measured by electron-probe and simulated by error solution of diffusion equation. The mutual diffusion coefficient is acquired on the assumption that the diffusion coefficient does not relate to concentration. Dissimilar to Boltzman-Matona method for acquiring diffusion coefficient relating to concentration, the least square method is used to obtain concentration curve equation for calculating the mutual diffusion coefficient of iron and nickel interface.