咪唑啉和季铵盐类缓蚀剂对P110S钢的缓蚀作用和机理研究

Study on Corrosion Inhibition and Mechanism of Imidazoline and Quaternary Ammonium Salt Inhibitor for P110S Steel

采用失重法、极化曲线、电化学阻抗谱(EIS)和扫描电镜(SEM)研究了咪唑啉和季铵盐缓蚀剂在H_2S/CO_2环境中对P110S钢的缓蚀作用和缓蚀机理。结果表明,咪唑啉缓蚀剂和季铵盐缓蚀剂均为阳极型缓蚀剂;在120℃,H_2S分压为0.55 MPa、CO_2分压为0.80 MPa的环境中,两种缓蚀剂均有一定的缓蚀作用,能有效抑制P110S钢的腐蚀;添加浓度为200 mg·L^(-1)时,咪唑啉缓蚀剂的缓蚀效率可达87.23%。

The corrosion inhibition and mechanism of imidazoline and quaternary ammonium salt inhibitors for P110 S steel in H2S/CO2 containing environment were investigated by mass loss method,polarization curve,electrochemical impedance spectroscopy(EIS)and scanning electron microscopy(SEM).The results show that the imidazoline inhibitor and quaternary ammonium salt inhibitor are all anode type corrosion inhibitors.The two inhibitors have a certain corrosion inhibition for P110 S steel saturated with 0.55 MPa H2S and 0.80 MPa CO2 at 120℃.The inhibition efficiency of imidazoline reaches 87.23%when its addition concentration is 200 mg·L-1.