硫酸盐环境氯氧镁水泥混凝土中钢筋防护试验

发布时间：2018-03-14 22:17

本文选题：氯氧镁水泥混凝土　切入点：涂层钢筋　出处：《西南交通大学学报》2017年02期 　论文类型：期刊论文

【摘要】：针对西部盐湖地区普通硅酸盐钢筋混凝土抗盐卤侵蚀性能较差的问题,制备了具有较强抗盐卤侵蚀性能的氯氧镁水泥钢筋混凝土.采用电化学工作站测试方法,测试了在硫酸镁溶液浸泡环境下,不同涂层钢筋的周期极化曲线及电化学参数(自腐蚀电位、腐蚀电流密度和腐蚀速率),研究了较高氯离子含量的氯氧镁水泥混凝土中钢筋的腐蚀性能及防护.研究结果表明:在氯氧镁水泥混凝土中裸露钢筋处于严重腐蚀状态,采用达克罗涂层、必耐斯涂层、锌美特涂层和美加力涂层保护的钢筋处于低腐蚀状态,有久美特涂层保护的钢筋未发现腐蚀;达克罗涂层、必耐斯涂层、锌美特涂层、久美特涂层和美加力涂层的腐蚀速率分别约为裸露钢筋腐蚀速率的1/36~1/19、1/20~1/13、1/31~1/16、1/91~1/50和1/22~1/16,表明涂层技术可以减缓氯氧镁水泥混凝土中钢筋的腐蚀速率.
[Abstract]:In view of the poor corrosion resistance of common silicate reinforced concrete in the western salt lake region, a magnesium oxychloride cement reinforced concrete with strong resistance to salt and halogen erosion was prepared. The electrochemical workstation test method was used. The periodic polarization curves and electrochemical parameters (self-corrosion potential) of different coated steel bars in the presence of magnesium sulfate solution were measured. Corrosion current density and corrosion rate are used to study the corrosion behavior and protection of reinforcement in magnesium oxychloride cement concrete with high chloride ion content. The results show that the exposed reinforcement in magnesium oxychloride cement concrete is in a serious corrosion state. The steel bars protected by Dacromet coating, Benez coating, Zinc-Mete coating and Mercantile coating are in low corrosion state, and the steel bars protected by Longmete coating have not been found to be corroded, while Dacromet coating, Benez coating, Zinc-Mete coating, The corrosion rates of the gumet coating and the MEA coating are about 1 / 36 / 1 / 19 / 20 / 1 / 13 / 31 / 31 / 91 / 1 / 50 and 1 / 22 / 1 / 16 of the corrosion rate of bare steel respectively, indicating that the coating technology can slow down the corrosion rate of steel bars in magnesium oxychloride cement concrete.
【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;西部土木工程防灾减灾教育部工程研究中心;北京大学地球与空间科学学院;
【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资助(KLSLRC-KF-13-HX-8)
【分类号】：TU528

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