摘要
选取耐海水腐蚀钢筋00Cr10MoV为实验材料,采用X射线光电子能谱(XPS)、电化学阻抗谱(EIS)和极化曲线等测试方法,研究了其在模拟混凝土孔隙液中钝化膜的组成和电化学行为,以及Cl^-对其钝化膜的影响。结果表明,00Cr10MoV试样在该条件下的钝化膜组成主要为FeO,Cr_2O_3,γ-FeOOH和CrOOH;Cl^-的存在对钝化膜形成有阻碍作用,且使试样的点蚀电位和电荷转移电阻有所下降,但对维钝电流密度影响不大;试样钝化240 h后形成的钝化膜耐Cl^-侵蚀能力较强,当Cl^-浓度达到5 mol/L时,电荷转移电阻仍维持在较大值,约为2.755×10~Ω·cm^2,其耐Cl^-侵蚀能力明显优于20MnSiV钢。
The electrochemical corrosion behavior of the seawater corrosion resistant rebar steel00Cr10MoV and the formed passive films on this rebar in simulated concrete pore solutions were examined by means of electrochemical impedance spectroscopy（EIS）, polarization curves and Xray photoelectron spectroscopy（XPS）. While the effect of Cl^-in solutions on the formation of passive films was also investigated. The results show that passive films formed on the 00Cr10MoV steel in simulated concrete pore solutions were composed of FeO, Cr_2O_3, γ- FeOOH and CrOOH.The Cl^-prevented the formation of passive films on the steel, and thereby resulted in decrease of pitting potential and charge- transfer resistance, but in little impact on the passive current density.The passive films formed on the steel after immersion in artificial solutions for 240 h exhibited excellent corrosion resistance to Cl^-solutions, which could maintain a large charge-transfer resistance of 2.755 × 10~6Ω·cm^2in solutions with Cl^-concentration as high as 5 mol/L. In general, the00Cr10MoV steel exhibited resistance to Cl^-attack superior to 20 MnSiV steel.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2016年第5期441-449,共9页
Journal of Chinese Society For Corrosion and Protection
基金
江苏省产学研联合创新资金―前瞻性联合研究项目(BY2013091)资助
关键词
耐海水腐蚀钢筋
模拟混凝土孔隙液
钝化膜
电化学阻抗谱
电荷转移电阻
seawater corrosion resistant rebar
simulated concrete pore solution
passive film
electrochemical impedance spectroscopy
charge-transfer resistance
