流体环境对碳钢表面附着缓蚀剂膜的影响  

Influence of Fluid Flow on a Corrosion Inhibitor Film on Carbon Steel Surface

作　　者：何毅[1] 范毅[2] 丁忆鑫 罗智[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]西南石油大学化学化工学院,成都610500

出　　处：《腐蚀科学与防护技术》2015年第1期31-36,共6页Corrosion Science and Protection Technology

基　　金：油气藏地质及开发工程国家重点实验室开放基金(PLN0806)资助

摘　　要：实验模拟了油、气集输过程碳钢管线中的流体环境,在不同流体速度、温度及成膜时间下,通过EIS技术考察45号钢表面附着缓蚀剂膜的耐腐蚀性能及破坏过程。缓蚀剂膜的腐蚀破坏过程中,EIS监测获得典型的电化学阻抗谱。结果表明,随着腐蚀时间、流体流速与流体温度的增加,碳钢表面附着缓蚀剂膜层由厚变薄,由致密变疏松,并表现出多孔性。因此,流体通过导致的表面剪切作用与气泡冲击,降低了该缓蚀剂的性能表现。通过SEM方法,辅助评价了处于不同状态下的缓蚀剂膜的结构。Effect of corrosive fluid flow on the performance of an inhibitor film on carbon steel is studied by means of electrochemical impedance spectroscopy(EIS) in a laboratory simulated environment, which aims to simulate the service condition of pipelines for oil and gas gathering and transferring. While the morphology of the inhibitor film was also characterized by SEM. Experimental results show that the thickness of the inhibitor film on the carbon steel 45 decreased and become much porous with the increasing fluid flow rate and temperature. Therefore, the effectiveness of this corrosion inhibitor is reduced due to the action of surface shear stress and bubble impact of the fluid flow.

关 键 词：缓蚀剂 膜层 流体 碳钢 电化学阻抗谱 

分 类 号：TG174.4[金属学及工艺—金属表面处理]