采用极化曲线和电化学阻抗法研究了H2S浓度、酸度以及液膜厚度对X70钢在含H2S薄层液膜下腐蚀行为的影响。结果表明,薄层液膜下，H2S促进了X70钢腐蚀的阴阳极过程; 随着H2S浓度升高，自腐蚀电位(Ecorr)正移，自腐蚀电流密度(Jcorr)增大，腐蚀速率增加; pH减小，Ecorr负移，Jcorr增大;当pH＜3.02时，低频端一维扩散特征的Warburg阻抗由一感抗弧所代替; 液膜厚度减薄，电荷传递电阻减小，X70钢腐蚀速率加快。

Corrosion behavior of X70 steel under thin layer of electrolytes containing hydrogen sulfide was studied by means of polarization curves and electrochemical impedance spectroscopy. The influence of hydrogen sulfide concentration, pH value and layer thickness were examined. The results showed that under thin electrolyte layers the cathodic and anodic processes both were promoted by hydrogen sulfide. With the increase of the hydrogen sulfide concentration, the corrosion potential (Ecorr), corrosion current (Jcorr) and corrosion rate of the steel increased. With the decrease of pH, Ecorr decreased, Jcorr increased to some extent. When the pH value was less than 3.02, a low-frequency inductance loop emerged and the Warburg impedance disappeared. The charge transfer resistance decreased and the corrosion rate increased with layer thickness decreasing.