【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. 1 V/SCE（SCE为饱和甘汞电极）恒电位极化7 d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Fe²⁺■Fe³⁺+e氧化还原反应;热轧皮表层的α-Fe₂O₃可还原为Fe₃O₄。更多还原

【Abstract】 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 Fe²⁺■Fe³⁺+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.更多还原