摘要
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 opti- mum 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.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2012年第3期232-235,共4页
Corrosion Science and Protection Technology
基金
国家科技重大专项大型油气田及煤层气开发项目(2008Z-X05017-04-01)资助
关键词
电化学阻抗谱
最佳保护电位
阴极保护参数
含水率
氯离子
EIS, optimal protection potential, cathodic protection parameters, moisture content,chloride ion
