【摘要】 采用恒应变试样浸泡试验、形貌分析技术和电化学测试技术,研究了咪唑啉缓蚀剂对N80油管钢在模拟CO2驱注井环空环境中应力腐蚀行为的影响。研究结果表明,N80油管钢在模拟环境中有较高的应力腐蚀敏感性,其机制为阳极溶解与氢脆的混合作用机制。咪唑啉缓蚀剂为阳极型缓蚀剂,加入溶液后会在N80油管钢表面形成缓蚀剂膜,抑制全面腐蚀和点蚀。随着缓蚀剂的浓度增加,N80油管钢的腐蚀速率下降。咪唑啉缓蚀剂通过抑制腐蚀的阳极过程,进而降低析氢速率,使N80油管钢的应力腐蚀敏感性下降。更多还原

【Abstract】 The constant strain specimen immersion test, morphology analysis technology and electrochemical testing technology were applied to study the effect of imidazoline corrosion inhibitor on the stress corrosion behavior of N80 pipeline steel in simulated CO2-injection annulus environment. The results showed that the N80 pipeline steel has higher stress corrosion sensitivity and the mechanism is the mixing mechanism of anodic dissolution and hydrogen embrittlement. The inhibitor was a kind of anodic corrosion inhibitor. After adding into the solution,a corrosion inhibitor film was formed on the surface of N80 tubing steel to inhibit overall corrosion and pitting. With the increase of inhibitor concentration,the corrosion rate decreased. The inhibitor reduced the stress corrosion sensitivity through inhibiting the anodic process of corrosion and thereby reducing the hydrogen evolution rate.更多还原