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研究了Cr对低合金耐蚀钢筋在饱和Ca(OH)_2混凝土模拟液中耐蚀性能的影响机制,为低合金耐蚀钢筋的研发提供理论上的依据。周期浸润腐蚀及循环动电位极化等实验表明,含Cr耐蚀钢筋的腐蚀敏感性及腐蚀速率远低于HRB400钢筋,其耐蚀机理主要表现为:Cr的添加改变了耐蚀钢筋的显微组织,形成大量细小且均匀分布的粒状贝氏体;Cr的添加改变了钢筋表面钝化膜的组成,使得含Cr耐蚀钢筋在混凝土模拟孔隙液中的点蚀电位更高,钝化膜更稳定;含Cr耐蚀钢筋的腐蚀产物中α-FeOOH的含量高于HRB400,进一步改善了钢筋耐蚀性。
The effect mechanism of Cr on the corrosion resistance of low alloy corrosion resisting steel in saturated Ca (OH) _2 concrete simulation liquid was studied, which provided a theoretical basis for the research and development of low alloy corrosion resisting steel. Periodic wetting corrosion and cyclic potentiodynamic polarization experiments show that corrosion resistance and corrosion rate of Cr-containing corrosion-resistant steel are much lower than that of HRB400 steel. The corrosion resistance mechanism is mainly as follows: the addition of Cr changes the microstructure of corrosion-resistant steel The formation of a large number of fine and uniform distribution of granular bainite; Cr added to change the composition of the passive film on the surface of the reinforcement, making the corrosion resistance of reinforced concrete containing chromium pitting corrosion in the pore potential higher, more passive film Stable; corrosion resistance of Cr-containing corrosion products α-FeOOH content higher than HRB400, to further improve the corrosion resistance of steel.