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.%Aiming at the low brine corrosion resistance of ordinary silicate reinforced concrete in salt lake areas of western China,a magnesium oxychloride cement reinforced concrete with higher brine corrosion resistance was fabricated.The polarization curves and electrochemical parameters,including corrosion potential,corrosion current density and corrosion rate,of steel bars with different coatings were investigated in magnesium sulfate solution using an electrochemical workstation measurement system,and the corrosion and protection of steel reinforcements in the chloride magnesium cement concrete with high chloride content were studied.The results show that the bare steel bar in the magnesium oxychloride cement concrete suffered severe corrosion,the steel bars with DACROMET,BENICE,ZINTEK and MAGNI coatings presented low corrosion,and the steel bar with GEOMET coating was far from corrosion.Specifically,the corrosion rate of steel bars with coatings of DACROMET,BENICE,ZINTEK,MAGNI and GEOMET was 1/36-1/19,1/20-1/13,1/31-1/16and 1/91-1/50,respectively,while the value was 1/22-1/16 for the bare steel bar.This proves that coating technology can slow down the corrosion rate of steel bars in magnesium cement concrete.
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