利用Wiener过程探究镁水泥混凝土中涂层钢筋在盐类环境下的腐蚀寿命

Corrosion Life Investigation of Coated Steel Bars in Magnesium Cement Concrete under Salt Solution Environment Using Wiener Process

采用氯盐溶液和硫酸盐溶液浸泡镁水泥钢筋混凝土构件,使构件中的涂层钢筋加速锈蚀,并利用电化学工作站进行电化学试验;以腐蚀电流密度作为钢筋耐久性退化指标,建立一元Wiener过程预测模型进行钢筋腐蚀寿命预测.结果表明:在氯盐溶液环境下,镁水泥混凝土构件中的钢筋受腐蚀问题较之硫酸盐溶液环境更为突出,且涂层在2种盐溶液环境中均对钢筋起到了较好的防护效果;在氯盐溶液环境中,涂层钢筋在1500 d附近进入中等腐蚀阶段,在硫酸盐溶液环境中,涂层钢筋在22000 d进入中等腐蚀阶段.

The magnesium cement reinforced concrete components were soaked in chloride and sulfate solutions to accelerate the corrosion of the coated steel bars in the components.The electrochemical workstation was used for electrochemical tests;the corrosion current density was used as the durability degradation index of the steel bars to establish a unary Wiener process.The prediction model was used to predict the corrosion life of steel bars.The results have shown that the corrosion of steel bars in magnesium cement concrete components is more prominent in the chloride salt solution environment than in the sulfate solution environment,and the coating has a better protective effect on the steel bars in the two salt solution environments.In the chloride salt solution environment,the coated steel bars enter a moderate corrosion stage around 1500 days,and the coated steel bars in sulfate solution environment enter a moderate corrosion stage at 22000 days.