腐蚀过程电化学动力学参数的计算机估算方法

NEW NUMERICAL METHODS FOR ESTIMATING THE ELECTROCHEMICAL KINETICS PARAMETERS OF CORROSION PROCESS USING WEAK POLARIZATION CURVE

利用计算机估算腐蚀过程电化学动力学参数是极化数据处理方法的一个发展趋势。文中对用高斯-牛顿法拟合三参数和四参数极化曲线方程式求取电化学动力学参数提出了两种改进方法。通过采用最优步长高斯-牛顿法和阻尼高斯-牛顿法(Levenberg-Marquardt)来提高拟合收敛度,降低对初值选择的限制。两种新方法均取得了相近的拟合结果。

Gauss-Newton method was used to estimate the values of electrochemical kinetics parameters by fitting the weak polarization curve of the corroding metal. In this paper, two new computation programs based on optimum step Gauss-Newton method and Levenberg-Marquardt method were proposed to speed up the fitting convergency and relax the requirements for initial values. The fitting results computed by the two improved methods were in good agreement,which indicated that both methods were applicable to the three and four parameters polarization curve equations.