摘要
利用极化曲线、电化学阻抗和电容法研究了温度、p H值和Cl-浓度对X100管线钢在高p H值土壤模拟溶液中所成钝化膜性能的影响。结果表明:X100管线钢在不同的介质中都可以发生钝化,但随着温度从20℃升到60℃、Cl-浓度从0.001 mol/L增大到0.005 mol/L以及p H值从10.84下降到9.27时,X100管线钢的钝化区间范围减小,抗腐蚀性能下降。电化学阻抗结果表明:随着温度升高、Cl-浓度增大和p H值下降,钝化膜的致密性下降,而温度是影响钝化膜致密性的最主要因素;电容测试和理论计算表明:Cl-浓度是影响钝化膜厚度的最主要因素,而温度则是影响钝化膜缺陷密度和缺陷扩散系数的最主要因素。
Effect of temperature, p H and chloride ion concentration on the property of passive films formed on X100 pipeline steel were investigated in an artificial soil solution by polarization curves, electrochemical impedance spectroscopy(EIS) and capacitance measurements technique.The results polarization measurement showed that the range of passive potential and the corrosion resistance of the steel decreased with the increasing temperature from 20 to 60 ℃, the increasing Cl-concentration from 0.001 to 0.005 mol/L and the decreasing p H value from 10.84 to 9.27 respectively. EIS results displayed that the compactness of passive films decreased with the increasing temperature and Cl-concentration, and the decreasing p H respectively, while temperature exhibited the strongest effect among the three factors on the compactness of the passive films. The results of capacitance measurement and theoretical calculation implied that the Cl-concentration exhibited the strongest effect on the thickness of passive film, while temperature exhibited the strongest effect on the defect density and diffusion coefficient of the passive films.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2015年第2期113-121,共9页
Journal of Chinese Society For Corrosion and Protection
基金
辽宁省教育厅2012年科学研究一般项目(L2012127)资助
