咪唑啉类缓蚀剂对含饱和CO_2的模拟油田采出液中Q235-A钢的缓蚀作用  

INHIBITION PERFORMANCE OF IMIDAZOLINE INHIBITORS FOR Q235-A STEEL IN THE SIMULATED PRODUCING WELL WATER SATURATED WITH CO_2

作　　者：王彬[1] 张静[1] 杜敏[1] 

机构地区：[1]中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室,青岛266100

出　　处：《中国腐蚀与防护学报》2010年第1期16-20,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(40806030)资助

摘　　要：用失重法、极化曲线和电化学阻抗谱测试技术研究了三种咪唑啉类缓蚀剂对Q235-A钢在85℃、含有饱和CO_2的模拟油田采出液中的腐蚀行为。结果表明,三种缓蚀剂都是典型的阳极抑制型缓蚀剂,作用方式为"负催化效应";由于所含亲水官能团不同,三种缓蚀剂吸附成膜速度具有较大差别。Inhibition performance of three kinds of imidazoline derivative inhibitors for Q235-A steel in the simulated producing well water saturated with CO_2 at 85℃were studied using weight loss and electrochemistry techniques including electrochemical impedance spectroscopy（EIS） and potentiodynamic polarization.The results of weight loss showed that the three kinds of imidazoline derivative inhibitors all had good inhibitor properties at concentration of 40 mg/L,the inhibition efficiency of inhibitor HSJ-3 was up to 80%.The sharp decrease of anodic current density and positive shift of corrosion potential（E_（corr）） indicated that these imidazoline derivative inhibitors were all anodic inhibitors which worked as＂negative catalysis＂.The results of EIS showed that the film of inhibitor HSJ-1 with alkyl formed slowly;the film of inhibitor HSJ-2 with thiourido group formed fast and could be auto-repaired;the film of inhibitor HSJ-3 with phosphonic group also formed fast,but decayed in a short time.

关 键 词：CO_2腐蚀 咪唑啉衍生物缓蚀剂 极化曲线 电化学阻抗谱 

分 类 号：O646[理学—物理化学]