摘要
采用电化学和表面分析技术对阴极极化条件下模拟混凝土孔溶液中钢筋热轧皮的还原行为进行了研究。用Mott-Schottky曲线分析阴极极化对带轧皮钢筋电荷传输特性的影响,用循环伏安曲线考察带轧皮钢筋在饱和Ca(OH)2溶液中的电极反应,用SEM和Raman光谱分析阴极极化后热轧皮组成的变化。结果表明:在饱和Ca(OH)2溶液中,-1.1V/SCE(SCE为饱和甘汞电极)恒电位极化7d后,带轧皮钢筋的施主浓度提高约一个数量级;钢筋热轧皮中能够发生Fe^2■Fe^3++e氧化还原反应;热轧皮表层的α-Fe2O3可还原为Fe3O4。
The cathodic reduction of mill scale on the rebar in simulated concrete pore solution was investigated by electrochemical and surface analysis methods. The influence of cathodic polarization on the charge transfer behavior of the rebar with mill scale in saturated Ca(OH)2 solution was detected by Mott-Schottky plots, and the electrode reactions were analyzed by cyclic voltammetry curves. The composition and phase transition in the mill scale caused by cathodic polarization were characterized by SEM and Raman spectra. The results showed that the donor density of the rebar electrode increased by about one order of magnitude after cathodic polarization at -1.1 V/SCE (saturated calomel electrode) for 7 d in saturated Ca(OH) 2 solution. The Fe^2+■Fe^3++e reaction could take place in the mill scale, and the α-Fe2O3 in the surface layer could transform to Fe3O4 after cathodic polarization under -1.1 V/SCE.
作者
王新
林飞
路新瀛
WANG Xin;LIN Fei;LU Xinying(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)
出处
《工业建筑》
CSCD
北大核心
2019年第5期115-120,共6页
Industrial Construction
关键词
钢筋
热轧皮
阴极还原
氧化铁
模拟孔溶液
rebar
mill scale
cathodic reduction
iron oxide
simulated pore solution
