摘要
采用电化学阻抗谱研究了普通钢筋和耐蚀钢筋在氢氧化钠、硅酸钠、硫酸钠、碳酸钠四种碱激发剂溶液中的钝化和脱钝行为,并采用饱和氢氧化钙溶液模拟普通混凝土的孔隙溶液作为对照。结果表明:钢筋钝化膜的形成和破坏过程高度依赖于激发剂种类和pH;水玻璃溶液中钢筋钝化膜最为稳定并具有良好的抗氯离子侵蚀能力,硫酸钠溶液中钢筋出现自腐蚀现象;相对于普通钢筋,耐蚀钢筋可以更加快速地形成钝化膜,并且其抗氯离子侵蚀性能更好。
Electrochemical impedance spectroscopy was adopted to characterize the passivation and depassivation behavior of ordinary steel bars and corrosion resistant steel bars in four kinds of alkali activator solutions of sodium hydroxide,sodium silicate,sodium sulfate and sodium carbonate.And saturated calcium hydroxide solution was used as a simulated pore solution in ordinary concrete for comparative study.The results show that the formation process and destruction process of steel bar passive films were highly relied on the type and pH value of activator.The steel bar passive film forming in Na_2SiO_3 solution was the most stable passive film and had the best ability to resist chloride corrosion.The steel bars self-corroded in Na_2SO_4 solution.Compared with ordinary steel bars,corrosion resistant steel bars can form passive film more quickly and had better corrosion resistance.
作者
杜玉娇
金祖权
陈永丰
DU Yujiao;JIN Zuquan;CHEN Yongfeng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)
出处
《腐蚀与防护》
CAS
北大核心
2018年第8期592-598,602,共8页
Corrosion & Protection
基金
国家自然科学基金(51378269
51678318)
铁道部科研计划(2014G004-F)
关键词
碱矿渣水泥
激发剂
钢筋钝化膜
电化学阻抗谱法
腐蚀
alkali slag cement
activator
steel bar passive film
electrochemical impedance spectroscopy
corrosion
