一种离子液体作为Q215钢表面前处理剂的抗腐蚀性能  

Anti-corrosive performance of an ionic liquid as metal surface pretreatment agent

作　　者：史雅靖 曲丰作[1] 张绍印[1] 徐同宽[1] 

机构地区：[1]大连工业大学轻工与化学工程学院,辽宁大连116034

出　　处：《大连工业大学学报》2016年第1期36-40,共5页Journal of Dalian Polytechnic University

基　　金：辽宁省教育厅科学研究项目(L2011279);辽宁省自然科学基金资助项目(201202012)

摘　　要：以月桂酸、三乙烯四胺、氯化苄和四氟硼酸为原料,合成了一种水溶性咪唑啉离子液体,用红外光谱法对中间体咪唑啉及离子液体进行结构表征;以该离子液体水溶液作为金属表面转化膜处理剂,通过浸渍法对Q215钢片表面进行处理后作为工作电极,用塔菲尔方法测试了不同浓度、pH的处理液对碳钢自腐蚀电位和腐蚀电流密度的影响,结果表明,处理液质量浓度2.0g/L、pH 5.5条件下电极自腐蚀电位和腐蚀电流密度均小于其他处理条件;用交流阻抗法研究了不同浸泡时间对碳钢表面防腐蚀膜层极化电阻的影响,结果显示室温2.0g/L、pH 5.5离子液体的处理剂在浸泡工作电极45～60min后所形成的防腐蚀保护膜极化电阻较大,45min以后浸泡时间的增加引起的极化电阻增大程度不明显,离子液体在钢表面形成腐蚀保护膜已达稳定状态。One water-soluble ionic liquid was synthesized from lauric acid, triethylenetetramine, benzyl chloride and tetrafluoroborate, and the structure of intermediates and ionic liquid were characterized by infrared spectroscopy. With Q215 carbon steel as work electrode after treated by immersing in ionic liquids, the impact of concentration and pH of evaluating pretreatment agent on the corrosion potential and corrosion current density was determined v/a Tafel test. The better result in anticorrosion ability was obtained when carbon steel was treated in 2.0 g/L ionic liquid at pH 5.5. Electrochemical impedance spectroscopy were used for studying the effect of immersion time on the polarization resistance of anticorrosive film formed on carbon steel. The maximum polaritization resistance of anticorrosive film was obtained when immersed in ionic liquid for 45-60 min but the polarization resistance didn＇t increase obviously after 45 min, at which the formed anticorrosive film on Q215 had reached a steady state.

关 键 词：离子液体 碳钢 抗腐蚀 前处理剂 

分 类 号：TG174.4[金属学及工艺—金属表面处理]