应用动电位极化曲线和交流阻抗方法,研究了铁在含H_2S的硫酸溶液中的腐蚀电化学行为,得出阴、阳极反应的动力学方程,并结合CNDO/2量化计算结果,提出了相应的腐蚀反应机制。结果表明,H_2S可大大促进铁阳极溶解反应,且低极化时反应较快,相应动力学参数为:v_(H+)=-0.83,v_(HS-)=0.35,b_a=40mV;H_2S对阴极反应的促进程度较小,且不随H_2S浓度改变,相应动力学参数为:v(H+)=1.19,v_(H_2S)=0,b_c=-116mV。
The electrochemical corrosion behavior of iron in H2S-containing sulfuric acid solutions have been studied by potentiodynamic and impedance measurements, and the kinetic equations of cathodic and anodic reactions were obtained. Furthermore, the corrosion mechanisms were proposed according to the results of quantum chemistry calculation. The results indicated that H2S accelerated the dissolution of iron, moreover, the anodic reaction under low applied potential was fast and the corresponding kinetic parametes were:vH+=-0.83, vHS-=0.35, ba ≈40mV. It was also shown that the acceleration extent of H2S for cathodic reaction was smaller than that for anodic reaction and independent on [H2S], and the corresponding kinetic parameters were vH+=1.19, vH2s=0, bc ≈-116mV.
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