耐蚀性钢筋耐蚀性能评价研究
Study on Evaluation of Corrosion Resistance of Corrosion-Resistant Steel Bar

采用周浸试验及半电池电化学测试等方法，研究了不同Cr含量耐蚀钢筋的腐蚀行为，对不同Cr含量耐蚀钢筋在氯离子环境下的耐蚀性能进行了评价，用光学显微镜和扫描电子显微镜观察了试样的显微组织和锈层形貌。获得了不同钢筋的临界氯离子浓度数值，并分别计算了钢筋的耐蚀能力指数。研究结果表明，合金元素Cr使得钢筋表面形成富Cr的致密稳定、粘附性好的内锈层，阻滞了钢筋锈蚀反应的物质传输，同时阻碍了Cl^？侵蚀钢筋基体，控制好硫化锰夹杂可以有效控制点蚀的发生，从而提高临界氯离子浓度。
The corrosion behavior of corrosion-resistant steel bars with different Cr content was studied by means of cyclic immersion test and semi battery electrochemical test. The corrosion resistance of corrosion-resistant steel bars with different Cr content in chloride ion environment was evaluated. The microstructure and rust morphology of the samples were observed by optical microscope and scanning electron microscope. The critical chloride concentration of different steel bars was obtained, and the corrosion resistance index of steel bars was calculated. The results show that the alloy element Cr makes the steel surface form a dense and stable inner rust layer, and it blocks the material transport of corrosion reaction. At the same time, it prevents chloride ion from corroding the steel base. Controlling the content of MnS inclusions can effectively prevent pitting, so as to improve the critical chloride ion concentration.