Macro and micro analysis of the protective effect of migrating corrosion inhibitor on steel reinforcement in concrete under wet and dry environment of chloride salt
In order to investigate the long-term protective effect of migrating corrosion inhibitor(MCI)on con-crete structures suffering from different degrees of chloride salt corrosion,in this study,reinforced concrete beams were exposed to NaCl solution(5％by mass)wet and dry cycles for different periods,and the protective effect of MCI on reinforcements in concrete beams was characterized in terms of bar's surface elements,mor-phology and protection efficiency.The results show that:1 For the corrosion of steel reinforcement caused by chloride salt corrosion,when the dosage of MCI is 400 g/m2,it can provide effective protection for steel rein-forcement at different stages and corrosion degrees.② Under the dry and wet environment of chloride salt,with the initial chlorine ion content increasing from 0 to 0.169％,the corrosion inhibition efficiency of MCI decreases from 98.39％to 83.12％,and thus chloride ions should be removed before using MCI to ensure the best possible efficiency.③ The corrosion inhibitor can effectively repair the cracks on the passivation film of the reinforcement surface and improves the density of the concrete,blocking the infiltration of harmful ions(such as Cl-)to inhibit or delay the occurrence of reinforcement corrosion.Our research can provide a basis for the application of MCI in coastal concrete projects.
chlorine salt wet and dry cyclereinforcement corrosionmigrating corrosion inhibitorprotection effi-ciencymicro analysis
NETL
NSTL
万方数据
