钢筋表面氧化层的阴极极化还原过程分析  

Reduction Process of Oxide Layer on Steel Surface under Cathodic Polarization

作　　者：鲁进亮[1,2,3] 张俊喜[1] 张羿 蒋俊[1] 马行驰[1] 王昆[4] 屈文俊[4] 

机构地区：[1]上海电力学院 上海高校电厂腐蚀防护与应用电化学重点实验室,上海200090 [2]中交上海港湾工程设计研究院有限公司 [3]上海申航基础工程有限公司,上海200120 [4]同济大学土木工程学院,上海200092

出　　处：《建筑材料学报》2013年第5期770-776,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50771602,50678127)

摘　　要：采用电化学测试方法结合表面分析,研究了再碱化条件下钢筋表面锈层发生还原的可能性,同时采用粉末微电极法研究了铁锈在碱性环境中的阴极过程.结果表明:钢筋及其氧化层在碱性环境中的电极过程都表现出良好的氧化还原性,铁锈的阳极过程表现出2个阶段,但无锈钢筋的阳极过程却表现出3个阶段,锈层氧化物经过电化学再碱化后能够发生不同程度的还原,同时其体积也会相应缩小,再碱化只使腐蚀电位有所正移,但并未使腐蚀电流密度明显降低.The electrochemical process and surface layer composition on steel surface under the conditions of cathodic polarization were studied. The electrochemical methods and surface analysis methods for steel were used to investigate the possibility that rust layer was reduced in alkaline solution. The cathodic process of rust in the alkaline environment was studied by powder microelectrode. The results show that the electrode process of steel and oxide layer in the alkaline environment shows obvious redox reaction. The anodie process of rust shows two phases, but that of steel shows three stages. Different degrees of re duction occur to rust by electrochemical realkalization, while its volume would be reduced accordingly. E is made further substantial increase by electrochemical realkalization, but the corrosion current density does not reduce significantly.

关 键 词：阴极极化 再碱化 微电极 钢筋 表面氧化层 还原 电化学交流阻抗谱 循环伏安 

分 类 号：TG174.4[金属学及工艺—金属表面处理]