HRB400 钢筋在模拟混凝土孔隙液环境中的阳极极化特征  

Anodic Polarization Characteristics of Rebar Steel HRB400in Simulated Concrete Pore Fluid

作　　者：商百慧 马元泰[2] 孟美江 李瑛[2] 娄明 白晶 SHANG Baihui;MA Yuantai;MENG Meijiang;LI Ying;LOU Ming;BAI Jing(Liaoning Provincial Engineering Research Center for High Value Utilization of Magnesite,School of Materials Science and Technology,Yingkou Institute of Technology,Yingkou 115014,China;Corrosion and Protection Division,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Yingkou Special Automobile Bearing Company,Yingkou 115004,China)

机构地区：[1]营口理工学院材料科学与工程学院、辽宁省菱镁矿高值利用工程研究中心,营口115014 [2]中国科学院金属研究所材料腐蚀与防护中心,沈阳110016 [3]营口特种汽车轴瓦有限公司,营口115004

出　　处：《中国腐蚀与防护学报》2024年第2期422-428,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：营口理工学院高层次人才科研启动项目(YJRC202018);辽宁省教育厅高等学校基本科研青年项目(LJKQZ2021182)。

摘　　要：研究了HRB400钢筋在模拟初期碳化混凝土环境中的阳极极化特征。结果表明,击破电位与对数坐标下的Cl-浓度存在线性关系。为验证钝化电位和过钝化电位作为击破电位关键参数点的合理性,绘制出钢筋点蚀敏感性的Cl-浓度与pH值关系图。In order to acquire the critical chloride ion concentration for the break-down of passivation film in the initial carbonization environment of concrete.According to the basic principle of electrochemical reaction,the anodic polarization characteristics of rebar steel HRB400 in a simulated initial carbonized concrete solution were studied by means of open-circuit potential-and anode polarization curvemeasurement.Results showed that there was a linear relationship between the breakdown potential and the chloride ion concentration in logarithmic plots,and the rationality of passivation potential and tranpassivation potential as the key parameters of the breakdown potential was analyzed.Based on this,the upper limit[Cl-]u and lower limit[Cl-]l of critical chloride ion concentration for rebar steel HRB400 are obtained.Accordingly,the relationship between pH value and chloride concentration of pitting corrosion sensitivity of the rebar steel was drawn.The service status of rebar steel HRB400 in the pH range of 12.5-11.0 is evaluated,and the expressions of the upper limit[Cl-]u and lower limit[Cl-]l of the critical chloride ion concentration and pH value are given.

关 键 词：钢筋混凝土 阳极极化 钝化电位 击破电位 过钝化电位 

分 类 号：TG174[金属学及工艺—金属表面处理]