氯盐侵蚀下阻锈剂对钢筋阻抗谱及微观形貌研究

为了研究氯盐侵蚀下阻锈剂对钢筋锈蚀的影响,设计制作了钢筋混凝土中掺入不同比例阻锈剂(醇胺类、亚硝酸钙)试件,开展了各试件在3.5%NaCl侵蚀溶液下钢筋锈蚀的电化学阻抗谱和表面微观试验,得到不同比例阻锈剂(醇胺类,亚硝酸钙)对混凝土中钢筋锈蚀的交流阻抗谱曲线及微观形貌图,分析了阻锈剂对钢筋锈蚀过程的影响。研究表明:0.8%醇胺类+0.8%亚硝酸钙阻锈剂的掺入延长了钢筋锈蚀脱钝时间,降低了钢筋锈蚀速率;对比各组微观形貌图发现添加复合阻锈剂的钢筋表面钝化膜致密,未发现锈斑,很好地保护了钢筋,达到了阻锈效果。

Study on the impedance spectroscopy and microscopic morphology of reinforcing bar influenced by corrosion inhibitor under chloride attack

In order to study the effect of rust inhibitor on the corrosion of steel bars under the corrosion of chloride salt,we designed and manufactured specimens of reinforced concrete mixed with different proportions of rust inhibitors(alcohol amines,calcium nitrite),conducted electrochemical impedance spectroscopy and surface microscopic tests of steel corrosion in 3.5%NaCl corrosion solution and analyzed the influence of rust inhibitor on the corrosion process of steel bars.The impedance spectroscopy curves and microscopic morphology of the corrosion of steel bars in concrete with different proportions of rust inhibitors(alcohol amines,calcium nitrite)are obtained.Studies have shown that the incorporation of 0.8%alcohol amine+0.8%calcium nitrite rust inhibitor prolongs the corrosion and deactivation time of steel bars,reduces the corrosion rate of steel bars;Comparing the microscopic morphology maps of each group,it is found that the passive film on the surface of the steel bar with the compound rust inhibitor is dense,and no rust spots are found,which protects the steel bar well and achieves the rust-inhibiting effect.