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通过盐雾实验、电化学阻抗谱和极化曲线研究了耐蚀钢筋20MnSiCrV和普通钢筋20MnSiV在氯盐环境下的耐蚀性能和腐蚀敏感性,利用SEM,EMPA线扫描和XRD分析锈层形貌、组成及合金元素的分布。结果表明,耐蚀钢筋的耐Cl-腐蚀承受能力较高,为普通钢筋的1.5倍;腐蚀速率和腐蚀坑深度分别为普通钢筋的58%和74%;两种钢表面锈层主要成分均为Fe3O4,α-FeOOH和γ-FeOOH,其中耐蚀钢筋的锈层为双层结构,Cr和Si明显富集在内层,有利于形成致密内锈层,提高钢筋的耐腐蚀性能。
The corrosion resistance and corrosion sensitivity of 20MnSiCrV steel and 20MnSiV steel under chloride salt environment were studied by salt spray, electrochemical impedance spectroscopy and polarization curves. The morphology of rust layer was analyzed by SEM, EMPA and XRD. , Composition and distribution of alloying elements. The results show that the corrosion resistant steel has a high resistance to Cl-corrosion, which is 1.5 times that of ordinary steel. The corrosion rate and depth of corrosion pits are 58% and 74% of those of ordinary steel respectively. The main components of rust on both steel surfaces are Fe3O4, α-FeOOH and γ-FeOOH. Among them, the rust layer of the corrosion-resistant steel bar has a double-layer structure, and Cr and Si are obviously enriched in the inner layer, which is favorable for forming a dense inner rust layer and improving the corrosion resistance of the steel bar.