应变对混凝土孔隙液中不锈钢钝化性能影响的电化学研究

Effect of Strain on Passivation of Stainless Steel in a Simulated Concrete Pore Solution

通过开路电位、电化学阻抗、Mott-Schottk等电化学方法研究了不同形变量的不锈钢在模拟混凝土孔隙液中的钝化性能。结果表明,随着形变量的增加,不锈钢的开路电位和阻抗值都逐渐降低,其钝化膜中氧空位浓度明显升高。随着形变量的增加,不锈钢的钝化性能有所降低。不同形变量的不锈钢的钝化性能之间的差异不会随着其在孔隙液中浸泡时间的延长而减小。

Passivation behavior of a deformed stainless steel in a simulated concrete pore solution was studied by means of open circuit potential （OCP）, electrochemical impedance spectroscopy （EIS）, and Mott-Schottky plots. The results show that with the increasing strain, the OCP and im- pedance of the steel decreased, whereas the concentration of oxygen vacancy in passive films in- creased. This result suggests that the passivation of the stainless steel is degraded by the increasing strain. In addition, the difference in passivation between the deformed samples would not be dimin- ished with the increasing immersion time.