EFFECTIVENESS OF MIGRATORY CORROSION INHIBITORS IN SIMULATED PORE WATER OF CHLORIDE-CONTAMINATED CONCRETE BY MEANS OF ELECTROCHEMICAL TECHNIQUES

摘要：

Corrosion of steel in concrete is the major cause of premature deterioration of reinforcedconcrete structures. Various methods to improve the durability and extend the service life ofconcrete structures have been used for the past two decades. More recently,migratingcorrosion inhibitors (MCI) are found to be one of the most simple and effective methods tocontrol rebar corrosion in concrete structures. This study was performed to test the inhibitionproperties of amino-alcohol and amine-carboxylates based corrosion inhibitors in solutions ofsimulating the concrete pore water and thus to develop curative inhibitor. The results showthat the monoamine-carboxylate inhibitor was inefficient when it was used in the conditionsof chloride contamination solution and only the ternary amine-carboxylates inhibitor showedan acceptable inhibitive action. The linear polarization resistance and potentiodynamicscanning curves show that the curative inhibitor is not only able to effectively decrease thecorrosion rate of the steel electrode in chloride containing environment but has a excellentself-repairing ability even when the steel is under strong anodic polarization. The test ofintegrative effect with surfactant addition in the curative inhibitor further indicate that theinhibition properties have great increase in Ca(OH)2 solution with 1-3％ NaCl. Theelectrochemical impedance spectroscopy (EIS) fitting data suggest that the protective layer ofthe curative inhibitor at the surface of steel becomes homogeneous and compact in presenceof chloride. The results in this work help to fill some doubts on the performance of organicinhibitors and help to develop a curative inhibitor.

关键词： migratory corrosion inhibitors simulated pore solutions concrete contaminated with chloride electrochemical techniques

作者: Zhiyong Liu Changwen Miao Jiaping Liu Wei Sun

作者单位: Jiangsu Research Institute of Building Science,Nanjing 210008,China;College of Materials Science and Jiangsu Research Institute of Building Science,Nanjing 210008,China;Jiangsu Key Laboratory of Constr Jiangsu Key Laboratory of Construction Materials,College of Materials Science and Engineering,Southe

会议类型: 国际会议

会议名称: 1st International Conference on Microstructure Related Durability of Cementitious Composites(首届与水泥基复合材料耐久性相关的微观结构国际会议)

会议地点: 南京

会议语种:英文

页码: 1367-1375

在线出版日期: 2008-10-13（万方平台首次上网日期，不代表论文的发表时间）