混凝土结构中钢筋初始表面状态对其腐蚀行为的影响  

Effect of initial surface condition on the corrosion behavior of reinforcing steel in concrete structure

作　　者：曹忠露[1,2,3] 米胜东[2] 陈浩宇[2] 魏连雨[1] 日比野誠 CAO Zhonglu MI Shengdong CHEN Haoyu WEI Lianyu HIBINO Makoto(School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China Tianjin Port Engineering Institute Ltd. of CCCC First Harbor Engineering Company Ltd. ,Tianjin 300222, China Concrete Laboratory. Kvushu InstitIlte nf T,~ehnn｜nov l~＇,t~b h,,_oi-,, ~N..tQ~s：r~ ~)

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]中交天津港湾工程研究院有限公司材料工程研究所,天津300222 [3]九州工业大学混凝土研究室,日本北九州市8048550

出　　处：《四川建筑科学研究》2017年第1期50-54,共5页Sichuan Building Science

基　　金：中交一航局科技研发项目(2016)

摘　　要：建立了宏电池腐蚀回路,通过分析不同初始表面状态的钢筋在无氯盐试块和有氯盐试块中的腐蚀电位、微电池腐蚀速度、极化曲线和宏电池腐蚀速度,研究了钢筋初始表面状态对其腐蚀行为的影响。结果表明,与全裸抛光表面相比,原氧化皮表面或初始锈蚀表面对改善钢筋的腐蚀电位起积极作用。锈蚀表面钢筋的微电池腐蚀速度较大且随着初始锈蚀程度的增加而增大。与初始锈蚀表面相比,原氧化皮表面能削弱钢筋的微电池腐蚀,但对其宏电池腐蚀有不利的影响。The influence of initial surface conditions on the corrosion behavior of reinforcing steel embedded in chloride-free and chloride-contaminated mortar was investigated by analyzing the half-cell potential, micro-cell corrosion rate, macro-cell corrosion rate and anodic/cathodic polarization curves. The results indicated that the existing oxides on the surface of the scaled or pre-rusted steels played a positive role in improving the half-cell potential. The micro-cell corrosion rate of rusted steels was much higher than that of polished and scaled steels, and increased with the increasing of pre-rusting degrees. The scaled surface could reduce the micro-cell corrosion of steel, but had a negative impact on the macro-cell corrosion of steel.

关 键 词：混凝土 钢筋 初始表面状态 微电池腐蚀 宏电池腐蚀 

分 类 号：TU503[建筑科学—建筑技术科学]