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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。
The effects of temperature, p H value and Cl- concentration on the passivation film properties of X100 pipeline steel in high p H soil simulating solution were investigated by polarization curves, electrochemical impedance and capacitance methods. The results show that passivation of X100 pipeline steel can be achieved in different media. However, the Cl-concentration increases from 0.001 mol / L to 0.005 mol / L and the p H value increases from 10.84 When it dropped to 9.27, the range of passivation range of X100 pipeline steel decreased and its corrosion resistance decreased. The results of electrochemical impedance spectroscopy showed that with the increase of temperature, the concentration of Cl- and the value of p H decreased, the densification of passivation film decreased, while the temperature was the most important factor affecting the densification of passivation film. The capacitance test and theoretical calculation showed that : Cl- concentration is the most important factor affecting the passivation film thickness, and temperature is the most important factor that affects the defect density and defect diffusion coefficient of passivation film.