采用动电位极化曲线及民化学阻抗法研究了硫酸根和温度对钢筋在混凝土模拟孔隙液中腐蚀电化学行为的影响。发现在有氯离子存在时，硫酸根具有缓蚀作用，提高了钢筋表面钝化膜的抗腐蚀性能；随着温度的提高，钢筋的极化电阻逐渐降低；随着pH值的提高，极化电阻逐渐增大。文中计算了不同pH值下腐蚀反应的活化能，并提出了硫酸根离子的缓蚀作用机制。
The effects of sulphate and temperature on the corrosion behavior of rebar in simulated pore solutions were studied by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS).The results showed that in the presence of chloride ions in simulated pore solution,sulphate ions had inhibition action,which enhanced the corrosion resistance of rebar.The inhibition mechanism of sulphate could be explained by the xompetitive adsorption between sulphate ions and chloride ions on the rebar surface.The polarization resistance(Rp) decreased with the ncrease in temperature and the decrease in pH.Meanwhile,the activation energy of corrosion reaction of rebar was calculated.With the elevation of the pH value from 9.75 to 12.45, the activation energy increased from 43.44 to 62.44kJ/mol.K.
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