模拟石油开采环境中石油管道的小孔腐蚀，通过对闭塞区内、外溶液进行腐蚀介质浓度分析、电化学分析以及对闭塞区内金属表面腐蚀形貌进行观察，研究了喹啉缓蚀剂（QA）对N80石油管道钢在0.5%CH3COOH+5%NaCl的饱和H2S溶液体系中小孔腐蚀的缓蚀性。结果表明：55℃时随着本体溶液中QA缓蚀剂浓度的增加，闭塞区Cl-和S2-浓度逐渐降低，抑制闭塞区溶液的pH值下降，对闭塞区的缓蚀效率逐渐增加。在本体溶液中添加0.6%～0.8%的QA缓蚀剂时，对小孔内材料的缓蚀率可达96.58%以上。%Simulating micropore corrosion of pipeline in petroleum exploitation environment, it studied the influence of quinoline corrosion inhibitor on micropore corrosion of N80 pipeline steel in 0.5%CH3COOH+ 5%NaCl saturated H2S solution system, through analysis on corrosion medium concentration of occlusion area inside and outside solution ,electrochemical analysis and corrosion morphology observation of metal surface. The result indicated that at 55℃with concentration of QA corrosion inhibitor increasing in solution, the concentration of Cl-and S2-gradually decrease in occlusion area, and control pH value in occlusion area solution decreasing can increase corrosion inhibition efficiency gradually. When adding 0.6%~0.8%QA corrosion inhibitor, the inhibition rate of micropore can reach more than 96.58%.
展开▼
