Synergistic Effects of Plastic Deformation and Chloride Ions on Corrosion Initiation of Steel Rebars in Simulated Concrete Pore Solution
Synergistic Effects of Plastic Deformation and Chloride Ions on Corrosion Initiation of Steel Rebars in Simulated Concrete Pore Solution
复制标题
塑性变形和氯离子对模拟混凝土孔隙溶液中钢筋腐蚀引发的协同作用
DOI：
10.1149/1945-7111/ac87d3
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发表时间：
2022
影响因子：
3.9
通讯作者：
Hiromoto Sachiko
中科院分区：
文献类型：
--
作者：
Doi Kotaro;Hiromoto Sachiko
通过在含有不同浓度Cl−的模拟混凝土孔隙溶液中对钢筋施加快速拉伸应变和循环应力，研究了塑性变形和Cl−对钢筋腐蚀起始的协同效应。在快速应变电极试验中，钢的钝化膜在塑性变形下破裂，阳极电流随着滑移台阶形成而急剧增加，而在弹性变形下几乎不破裂。当测试溶液的Cl-与OH-浓度比（[Cl-]/[OH-]）为0.4或更大时，在滑移台阶上开始局部腐蚀。在[Cl−]/[OH−]≥ 0.4的循环应力下也发生局部腐蚀。实验结果表明，滑移台阶的形成，由于局部应力集中和抑制再钝化的Cl-引发的腐蚀下，一个显着小的[Cl-]/[OH-]比的组合。
The synergistic effects of plastic deformation and Cl− on corrosion initiation of steel rebars was examined by applying rapid tensile strain and cyclic stress to the steel in a simulated concrete pore solution with various concentrations of Cl−. In a rapid straining electrode test, the passive film of the steel was broken under plastic deformation and the anodic current increased sharply with the onset of slip step formation, whereas it was hardly broken under elastic deformation. Localized corrosion was initiated on the slip steps when the Cl− to OH− concentration ratio ([Cl−]/[OH−]) of the test solution was 0.4 or more. Localized corrosion also occurred under cyclic stress at [Cl−]/[OH−]≥ 0.4. Experimental results demonstrated that the combination of slip step formation due to local stress concentration and the inhibition of repassivation by Cl− initiated corrosion under a significantly small [Cl−]/[OH−] ratio.