达克罗涂层对氯氧镁水泥混凝土中钢筋防护试验  

Experimental study on steel bar with dacromet coating protection in magnesium oxychloride cement concrete

作　　者：乔宏霞[1] 郭向柯 王鹏辉 巩位 

机构地区：[1]兰州理工大学土木工程学院,兰州730050

出　　处：《功能材料》2018年第2期2193-2197,2203,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51168031;51468039);中国科学院盐湖资源与化学重点实验室开放基金资助项目(KLSLRC-KF-13-HX-8)

摘　　要：为了解决盐渍土对普通钢筋混凝土抗盐卤性能较差的问题,结合西部地区基础工程受盐卤腐蚀情况,利用电化学方法,在模拟西部盐卤环境条件下,测试了氯氧镁水泥混凝土中达克罗(DKL)涂层钢筋在氯盐和硫酸盐溶液浸泡环境下的极化曲线,氯氧镁水泥混凝土中的裸露钢筋作为对照组。研究表明,氯氧镁水泥混凝土中的DKL涂层钢筋在氯盐和硫酸盐溶液的腐蚀速率明显小于裸露钢筋,分别可达到裸露钢筋的1/61和1/35,即DKL涂层具有较好的抵抗氯盐和硫酸盐腐蚀的能力,从而可以很好的解决氯氧镁水泥混凝土在西部盐渍土的应用问题。In order to solve the problem of poor bittern resistance of ordinary reinforced concrete under saline environment,based on the bittern corrosion of foundation project in western region,polarization curves of dacromet(DKL)coating rebar in magnesium oxychloride cement concrete in chloride and sulfate solution were tested in this paper by using electrochemical methods,and the exposed reinforcement in magnesium oxychloride cement concrete was used as the control group.The results show that the corrosion rate of DKL coating rebar in magnesium oxychloride cement concrete in chloride and sulfate solutions is obviously smaller than that of exposed reinforcement,and the rate of that in chloride and sulfate solutions can reach to 1/61 and 1/35 of exposed steel bars respectively.Therefore,DKL coating rebar has the better resistance to chloride and sulfate corrosion,which can improve the corrosion resistance of magnesium oxychloride cement concrete in western saline soil.

关 键 词：氯氧镁水泥混凝土 极化曲线 涂层钢筋 腐蚀电流密度 腐蚀速率 

分 类 号：TU511[建筑科学—建筑技术科学]