金属熔盐腐蚀的电化学评定方法——极化曲线拟合法

ELECTROCHEMICAL EVALUATION OF CORROSION RESISTANCE OF METALS AND ALLOYS IN MOLTEN SALTS—POLARIZATION CURVE FITTING

根据高温熔盐体系中腐蚀金属电极的极化行为特征,提出了与之相适应的极化曲线方程。在腐蚀过程的阴极或阳极反应是准可逆的情况下,腐蚀金属电极的极化曲线方程式包含5个以上电化学参数。本文证明,利用分段曲线拟合,再用随机尝试法加以优化,可以求得合适的初始值,使迭代收敛,从而求得电化学参数。编制了一个BASIC语言的计算程序,并讨论了编制程序时应考虑的问题。

The polarization behavior of corroding metals aod alloys in molten salts is more complex than that in aqueous solution at room-temperature. The polarization curve equations containing more than five kinetic parameters have been derived.In these cases,initial values of parame- ters for Newton-Gause method should be optimized so that repeated calculation can be convergent.The procedure,using different range of polarization curve fitting and random trying method,to seek suitable initial values has been proposed in this paper.A computing program in BASIC for IBM-PC computer is worked out and the problems encountered in compiling the program are discussed.