A LABORATORY EVALUATION TECHNOLOGY FOR DETERMINATION OF CATHODIC PROTECTION PARAMETERS OF 16Mn STEEL IN SOIL
16Mn钢在土壤中的阴极保护参数实验室评价技术研究

Cathodic polarization behavior of 16Mn steel had been studied in four types of soil with different moisture contents by electrochemical impedance spectroscopy(EIS).A method was found out to determine cathodic protection parameters rapidly and exactly by simulation experiment in laboratory.The results revealed that charge transfer resistance(R_t)vs cathodic polarization potential(E_(e,c))curves plotted by EIS,which could be used to analyze control mechanism of corrosion process and to select appropriate cathodic protection parameters.Corrosion control mechanism could be judged by the shape of R_t-E_(e,c) curves.Characteristic points of the curves could determine the minimum protection potential,the optimum protection potential and the maximum protection potential.And then it was feasible that the cathodic protection parameter in soil could be studied by the curves of charge transfer resistance(R_t)vs cathodic polarization potential(E_(e,c))according to weight loss experiment.