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采用模拟闭塞电池装置研究了油管钢材(N80钢)在Na_2S+NaCl介质中添加喹啉衍生物缓蚀剂后闭塞区内化学状态的变化,利用动电位扫描法、交流阻抗(EIS)和SEM技术分析了N80钢局部腐蚀的阴极、阳极腐蚀机理,以及Cl-和S2-对N80钢的腐蚀影响状况.结果表明,在2%Na2S+5%NaCl、2%Na_2S+8%NaCl、2%Na_2S+10%NaCl3种溶液体系中,闭塞电池阳极极化后,闭塞区溶液酸化,其pH值急剧下降.Cl-和S2-的迁入量增加,并在闭塞区内浓集.当添加喹啉缓蚀剂后,缓蚀剂能够通过降低阴离子Cl~-、S2~-在闭塞区内富集,降低酸化速度,加入0.8%喹啉缓蚀剂,可使闭塞区内的缓蚀效率达到82%.
The changes of chemical state in the occluded area of the tubing steel (N80 steel) after addition of a quinoline derivative inhibitor in a Na_2S + NaCl medium were studied by using the simulated occlusion cell device. By using the potentiodynamic scanning, alternating current impedance (EIS) and SEM The corrosion mechanism of cathode and anode in local corrosion of N80 steel and the corrosion of Cl-and S2-N80 steel were analyzed.The results showed that the corrosion of N80 steel in 2% Na2S + 5% NaCl, 2% Na2S + 8% NaCl, + 10% NaCl solution system, the occluded cell was acidified after the anodic polarization of the occluded cell, its pH dropped sharply, and the immigration amount of Cl- and S2- increased and concentrated in the occluded region. When adding quinoline After the inhibitor, the inhibitor can reduce the rate of acidification by reducing the anion Cl ~ -, S2 ~ - in the occlusion zone, adding 0.8% quinoline inhibitor, the corrosion inhibition efficiency can reach 82 %.