Cr合金化对HRB400钢筋腐蚀行为的研究  

Corrosion Behavior of Cr Modified HRB400 Steel Rebar in 2% NaCl Solution

作　　者：刘明[1] 程学群[1] 李晓刚[1,2] 刘广华[1] 庞靖宇[1] 朱言晨 

机构地区：[1]北京科技大学腐蚀与防护中心,北京100083 [2]中国科学院宁波材料技术与工程研究所,宁波315201

出　　处：《腐蚀科学与防护技术》2015年第6期559-564,共6页Corrosion Science and Protection Technology

基　　金：国家重点基础研究发展计划(2014CB643300);国家科技基础条件平台建设项目资助

摘　　要：应用动电位极化、电化学阻抗谱、周浸腐蚀实验的方法研究了HRB400普通碳钢钢筋和两种Cr合金化的低合金钢筋在2%Na Cl溶液中的腐蚀行为。结果表明:相比HRB400钢筋,Cr合金化的钢筋的开路电位明显正移,Cr加入提高了钢的热力学稳定性;随着Cr含量的增加,钢筋的自腐蚀电流密度减小,极化电阻增大,Cr合金化的钢筋具有相对较小的电化学腐蚀速率;周浸加速腐蚀72 h后,HRB400钢筋以均匀腐蚀为主,Cr合金化的钢筋以局部腐蚀为主,添加Cr可以显著降低HRB400钢筋的均匀腐蚀速率。Corrosion behavior of the Cr modified HRB400 carbon steel rebar in 2%NaCl solution was investigated by means of dry/wet cyclic corrosion test, potentiodynamic polarization and elec- trochemical impedance spectroscopy. Results show that the open circuit potential moved to higher value in positive direction; the corrosion current density decreased; the polarization resistance in- creased and the corrosion rate declined for the Cr modified steel in comparison to HRB400 steel. After dry/wet cyclic corrosion test for 72 h, the HRB400 steel exhibited an uniform corrosion mor- phology, however the Cr modified steel rebar exhibited feaaxres of local corrosion. Anyhow, the addition of Cr can significantly reduce the uniform corrosion rate of HRB400 steel rebar.

关 键 词：Cr合金化 开路电位 极化曲线 电化学阻抗谱 腐蚀速率 

分 类 号：TG172[金属学及工艺—金属表面处理]