论文部分内容阅读
采用极化曲线、电化学阻抗谱技术对4种盐渍土环境下的钢筋混凝土试件进行了测试,考察了不同腐蚀环境及腐蚀阶段钢筋混凝土试件腐蚀特征的差异性.试验结果表明:盐渍土环境中硫酸根离子与氯离子的质量比m(SO2-4)/m(Cl-)不同,钢筋的腐蚀特征呈现明显的差异;总含盐质量分数为5%的模拟液中m(SO2-4)/m(Cl-)由0增加为0.082或0.275时,在腐蚀中、后期钢筋腐蚀速率较快;当m(SO2-4)/m(Cl-)为2.070时,钢筋在整个腐蚀龄期内的腐蚀速率均较慢,说明盐渍土环境中硫酸根离子在一定含量范围内能促进钢筋的腐蚀.最后结合电化学测量结果对硫酸盐的作用机理进行了分析.
The polarization curves and electrochemical impedance spectroscopy (EIS) were used to test the reinforced concrete specimens in four kinds of saline soils, and the differences of the corrosion characteristics of reinforced concrete specimens in different corrosive environments and corrosion phases were investigated. The results showed that the salt In the soil environment, the corrosion resistance of the steel bars is obviously different from that of the m (SO2-4) / m (Cl-) of the sulfate ion and the chloride ion. In the simulation liquid with the total salt content of 5% (SO2-4) / m (Cl-) increased from 0 to 0.082 or 0.275, the corrosion rate of the steel during the later stage of corrosion was faster. When the ratio of m (SO2-4) / m (Cl-) was 2.070, The corrosion rate in the corrosion period is slow, which indicates that the sulfate ion in the saline soil can promote the corrosion of the steel bar within a certain range of content.At last, the mechanism of action of sulfate on the electrochemical measurement is analyzed.