利用电化学阻抗谱技术, 研究X70 钢的最佳阴极保护电位随土壤中Cl－和含水率的变化. 结果表明:在Cl－含量< 10 mmol/kg 时最佳保护电位随着含水率的增加先升高后降低, 变化幅度在150 mV左右; Cl－含量≥10 mmol/kg 时, 最佳保护电位随着含水率增加呈现降低的趋势; Cl－含量为20 mmol/kg 时的不同含水率的土壤中最佳保护电位均达到最小值; 随着含水率的升高Cl－对最佳保护电位的影响逐渐减小.
The relationship of moisture and chloride ion content in Qingdao soil with the optimum cathodic protection potential for X70 steel was studied by electrochemical impedance spectroscopy(EIS)in a laboratory test set. The results revealed that the optimum cathodic protection potential increased firstly, then reduced with the increase of moisture content when chloride ion was less than 10 mmol/kg with a potential fluctuation about 150 mV. When the chloride ion is greater than 10 mmol/kg, the optimal protection potential showed a trend of reducing with increasing moisture content. The optimal cathodic protection potential in soil with various moisture contents reached a minimum for chloride ion content of 20 mmol/kg. With the rise of moisture content, the influence of chloride ion decreased gradually.
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