研究弱极化区极化曲线来估算腐蚀过程的电化学动力学参数

对一个活化极化控制的腐蚀体系,其腐蚀金属电极的弱极化曲线方程式包含3个电化学动力学参数,但同时测定出这些动力学参数还是一个棘手的问题。本文证明:利用Newton迭代法和最小二乘法曲线拟合等数值汁算方法直接对腐蚀金属电极的弱极化曲线拟合,估算出这些动力学参数。编制了汇编语言的计算程序,并讨论了推导和编制时应注意的问题,以及对算法进行了仿真验算。

ESTIMATION OF ELECTROCHEMLCAL KINETIC PARAMETERS OF CORROSION PROCESSES BY STUDYING POLARIZATION CURVE IN WEAK POLARIZATION REGION

There are three electrochemical kinetic parameters in the weak polarization curve equation of corroding systems controlled by activation polarization, but it is difficult to estimate all these parameters at the same time. The best way to deal with this problem is to estimate the values of kinetic parameters by fitting the weak polarization curves measured on corroding metals. It is shown that the Newton iterration and least square curve-fitting method can be applied for the purpose. A compiling program in Assembly Language is worked out, the problems encountered in deriving and compiling the program are discussed, and the algorithm is examined imitatively.