摘要
应用极化曲线法和电化学阻抗技术,结合扫描电子显微镜方法,测试钢筋在模拟混凝土孔隙液中的钝化与去钝化行为,以及溶液pH值对钢筋电化学腐蚀行为的影响作用。结果表明,钢筋在pH值为12.50的模拟液中处于钝态,随着溶液pH值的降低,钢筋的耐蚀性下降。钢筋表面去钝化发生腐蚀的临界pH值在11.12～11.05范围内。
The passivation and depassivation behavior of reinforcing steel in simulated concrete pore solutions（SPS） with different pH values was studied by the polarization curves,electrochemical impedance spectroscopy and scanning electron microscopy.The results indicated that reinforcing steel was in the passive state in the simulated concrete pore solution with pH 12.50.The lower the pH value of solutions,the more unstable the passive film of reinforcing steel.The critical pH value for the localized corrosion of the reinforcing steel in the simulated concrete pore solutions was between 11.12 and 11.05 based on the electrochemical measurements.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第2期291-293,297,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(20473066)
国家自然科学基金重点资助项目(50731004)
国家科技支撑计划资助项目(2007BAB27B04)
关键词
钢筋
模拟混凝土孔隙液
PH
极化曲线
电化学阻抗谱
reinforcing steel
simulated concrete pore solution
pH
polarization curve
electrochemical impedance spectroscopy
