氯离子侵蚀下异类钢筋的腐蚀行为

Corrosion Behavior of Different Bars in Chloride Ion Corrosion

为了比较钢筋混凝土结构中光圆钢筋与带肋钢筋在腐蚀过程中的差异,以氯离子侵蚀为脱钝机制,根据相关腐蚀电化学原理,使用有限元软件COMSOL MULTIPHYSICS进行模拟;模型不但耦合了基于电化学、氯离子、温度和水分的多物理场,还对钢筋的去钝化行为和腐蚀速率进行了分析。结果表明:同种工况下、同种规格的两种钢筋中,带肋钢筋的去钝化时间更短,优先腐蚀且腐蚀速率比光圆钢筋更大;横肋最大宽度和间距的减小都将导致钢筋腐蚀速率的增加。

In order to compare the difference of corrosion process between plain round bars and deformed bars which are used in reinforced concrete structure,for the corrosion caused by chloride ion with a depassivation mechanism,simulated was performed using FEM simulation software COMSOL MULTIPHYSICS according to the principle of corrosion electrochemistry.The model not only coupled multiphysics based on electrochemistry,chloride ion,temperature and humidity,but also analyzed the depassivation behavior and corrosion rate of the bars.The results showed that under the same working condition and with the same dimension,compared with plain round,deformed bars had shorter depassivation time,faster corrosion rate,and corroded easily.The decrease of maximum width and distance of transverse ribs increased the corrosion rate.