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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 seawater-corroded steel 00Cr10MoV was selected as the experimental material. The composition of the passive film and its composition in simulated concrete pore fluid were studied by X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and polarization curves. Electrochemical behavior, and Cl ~ - on the passivation film. The results show that the passivation film composition of 00Cr10MoV sample is mainly FeO, Cr_2O_3, γ-FeOOH and CrOOH under the conditions; Cl ~ - obstruct the formation of passivation film, and the pitting potential and The charge-transfer resistance decreased, but it had little effect on the current density. The passivation film formed after 240 h passivation was more resistant to Cl ~ - erosion. When the Cl ~ - concentration reached 5 mol / L, The charge transfer resistance is still at a relatively large value of about 2.755 × 10 ~ Ω · cm ~ 2, and its resistance to Cl ~ - erosion is obviously better than that of 20MnSiV steel.