Corrosion resistance performance of rebars rolled from vanadium micro-alloyed (VMA) steel was evaluated vis-à-vis rebars rolled from steel having similar chemistry to the (VMA) steel without vanadium and subjected to thermomechanical treatment after hot rolling (TMT). Three test environments namely simulated concrete pore solution, mortars, and industrially polluted atmosphere were used to assess the performance of these rebars. Mass loss, electrochemical impedance spectroscopy, DC polarization and potential-time studies were employed to acquire quantitative data and explain the observed results. Raman spectroscopy was used to identify the corrosion products formed on the surface of the exposed rebars in different environments. The corrosion resistance of VMA rebars was better than TMT especially with increased duration of exposure in chloride contaminated concrete environments. However, under the industrially polluted atmosphere, both rebars exhibited comparative corrosion rates. Lesser detrimental effect of chloride present in concrete environment on the VMA steel rebars is attributed to the higher grain boundary per unit area in these rebars than in the TMT rebars. It is suggested that owing to the stronger tendency of the higher-grain-boundary- material to interact with oxygen and moisture, a thicker film of Fe(OH)3wasformed on its surface than on the surface of the TMT rebar, prior to their exposure to the test environments. This hydroxide film dissolved in alkaline environment of concrete, nucleated and grew as a protective FeOOH film on the surface of the rebars.

相对于由化学性质与不含钒的（VMA）钢并经热轧（TMT）进行热机械处理的螺纹钢相比，评估了由钒微合金（VMA）钢轧制的螺纹钢的耐腐蚀性能。三种测试环境，即模拟的混凝土孔隙溶液，砂浆和工业污染的大气被用来评估这些钢筋的性能。质量损失，电化学阻抗谱，直流极化和电位时间研究被用来获取定量数据并解释观察到的结果。拉曼光谱法用于鉴定在不同环境中暴露在钢筋表面上的腐蚀产物。VMA钢筋的耐腐蚀性优于TMT，尤其是在氯离子污染的混凝土环境中暴露时间延长。但是，在工业污染的气氛下，两个钢筋均显示出相对的腐蚀速率。混凝土环境中存在的氯化物对VMA钢筋的危害较小，这归因于与TMT钢筋相比，这些钢筋每单位面积的晶界更高。建议由于高晶粒边界材料与氧气和水分相互作用的趋势更强，因此在暴露前，在其表面上形成的Fe（OH）3膜比在TMT钢筋表面上形成的膜厚。测试环境。该氢氧化物膜溶解在混凝土的碱性环境中，在钢筋表面成核并以FeOOH保护膜的形式生长。