模拟CO_2驱环境中咪唑啉类缓蚀剂对J55钢腐蚀性能的影响

Effect of Imidazoline Inhibitors on Corrosion Performance of J55 Steel in Simulated CO_2 Flooding Environment

采用极化曲线和电化学阻抗谱方法研究了模拟CO_2驱环境中两种咪唑啉类缓蚀剂对J55钢的缓蚀性能。利用拟合得到了电化学腐蚀的热动力学参数并对其进行了分析,同时计算了两种缓蚀剂对J55钢的缓蚀效率。结果表明,腐蚀电流密度(J_(corr))均随缓蚀剂用量提高而不断减小,缓蚀剂作用下的电荷传递电阻RI均远远大于空白试验条件下的R_t值,改性咪唑啉缓蚀剂比咪唑啉缓蚀剂对C02腐蚀具有更好的缓蚀效果。

The effect of inhibitors on the performance of J55 steel in simulated CO2 flooding environment added two kinds of imidazoline inhibitors was investigated by means of polarization curves and electrochemical impedance spectroscopy（EIS）. The parameters of thermal dynamics of electrochemical corrosion were fitted and analyzed, and the inhibition efficiencies were also calculated. The results indicated that the corrosion current density decreased with increasing the contents of inhibitors. Due to the effect of inhihitors, the charge transfer resistance was greater than that under the blank condition. In addition, modified imidazoline inhibitor has better inhibition performance than imidazoline inhibitor for CO2 corrosion.