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采用EIS和线性极化曲线技术研究了供货状态和打磨后的钢筋样品在模拟孔隙液中Cl-浓度渐变条件下的腐蚀行为。采用SEM结合EDS和XRD对钢筋表面形貌和组成结构进行了分析。结果表明:在Cl-浓度逐渐增加的孔隙液中,钢筋表面的电化学行为基本可分为3个过程,即钝化膜形成或修复过程、Cl-侵蚀过程和Ca沉积过程。供货状态钢筋比打磨后的钢筋样品更容易发生腐蚀。结合电极的腐蚀电位、腐蚀电流和电化学阻抗等参数随Cl-浓度的变化,讨论了混凝土中钢筋腐蚀发生、发展各阶段的腐蚀电化学过程的变化规律。
EIS and linear polarization curves were used to study the corrosion behavior of steel bars after grinding and grinding under the Cl- concentration gradient in simulated pore fluid. The surface morphology and composition of rebar were analyzed by SEM combined with EDS and XRD. The results show that the electrochemical behavior of the surface of rebar can be divided into three processes in the pore fluid with increasing Cl-concentration: the formation or repair of passivation film, the Cl-erosion process and the Ca deposition process. Steel reinforcement is more prone to corrosion than polished steel reinforcement. Combined with the changes of the corrosion potential, corrosion current, electrochemical impedance and other parameters with the Cl- concentration, the variation of the corrosion electrochemical process in various stages of the development of the steel was discussed.