不同环境下镁水泥混凝土中钢筋的电化学腐蚀

发布时间：2018-10-10 18:31

【摘要】：钢筋锈蚀是钢筋混凝土结构破坏的主要形式之一,我国西部盐湖地区出现钢结构及钢筋混凝土结构受盐卤水侵蚀导致其破坏现象严重。氯氧镁水泥混凝土具有显著的抵抗盐卤腐蚀的作用,针对镁水泥混凝土中钢筋受氯盐腐蚀降低其使用寿命而制约镁水泥钢筋混凝土使用的问题,本研究用美加力涂层来提高钢筋的抗腐蚀性能。采用CS350电化学工作站对钢筋腐蚀的数据采集,结合SEM(scanning electron microscope)微观扫描和EDS(energy dispersive spectrometer)元素分析结果表明:在硫酸盐溶液中涂层钢筋腐蚀程度最大,氯盐次之,干燥环境下钢筋腐蚀最轻;镁水泥混凝土保护层厚度对腐蚀速率不起决定性作用。
[Abstract]:The corrosion of steel bar is one of the main forms of structural damage of reinforced concrete. Steel structure and reinforced concrete structure are damaged seriously by salt brine erosion in the salt lake area of western China. Magnesium oxychloride cement concrete has a remarkable function of resisting salt and halogen corrosion. In view of the problem that the reinforcement in magnesium cement concrete is corroded by chlorine salt to reduce its service life, the use of magnesium cement reinforced concrete is restricted. In this study, the corrosion resistance of steel bar was improved by using the United States applied force coating. CS350 electrochemical workstation was used to collect the corrosion data of steel bar. The results of SEM (scanning electron microscope) microscanning and EDS (energy dispersive spectrometer) element analysis showed that the corrosion degree of coated steel bar was the largest in sulfate solution, followed by chlorine salt, and the corrosion of steel bar in dry environment was the least. The thickness of magnesium cement concrete cover does not play a decisive role in corrosion rate.
【作者单位】：兰州理工大学甘肃省土木工程防灾减灾重点实验室;西北民族大学土木工程学院;中国科学院青海盐湖研究所盐湖资源与化学重点实验室;
【基金】：国家自然科学基金资助项目(51168031,51468039) 甘肃省自然科学基金资助项目(1310RJZA051)
【分类号】：TU528

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