涂层钢筋氯氧镁水泥混凝土的腐蚀性研究

为了解决钢筋氯氧镁水泥混凝土的锈蚀问题,根据西部盐渍土地区的自然环境,对涂层钢筋氯氧镁水泥混凝土进行了溶液浸泡加速锈蚀试验;通过电化学试验测得了表征裸露钢筋和涂层钢筋氯氧镁水泥混凝土锈蚀的极化曲线,对钢筋的开路电位和腐蚀电流密度在不同阶段的锈蚀程度进行分析,并且利用SEM和XRD微观试验对其产物进行分析。最终得出:在不同环境下,涂层可以很好的保护氯氧镁水泥混凝土中的钢筋免受腐蚀。在最后腐蚀达到稳定后,涂层钢筋的腐蚀电流密度是裸露钢筋的1/25,且裸露钢筋表面存在疏松颗粒状的腐蚀产物和大小不一的空洞,涂层钢筋表面只存在点蚀,从而得出涂层对钢筋氯氧镁水泥混凝土有很好的防腐效果。

Study on corrosion of coated reinforced magnesium oxychloride cement concrete

In order to solve the corrosion problem of reinforced magnesium oxychloride cement concrete,the accelerated corrosion test of coated reinforced magnesium oxychloride cement concrete by solution immersion was carried out according to the natural environment of saline soil area in Western China,and the polarization curves characterizing the corrosion of bare steel bars and coated reinforced magnesium oxychloride cement concrete were measured by electrochemical test.The corrosion degree of steel bars at different stages was analyzed by open circuit potential and corrosion current density,and the products were analyzed by SEM and XRD microscopic tests.Finally,it is concluded that the coating could protect the steel bar in magnesium oxychloride cement concrete from corrosion in different environments.After the final corrosion was stable,the corrosion current density of the coated steel bar was1/25 of that of the bare steel bar,and there were loose granular corrosion products and voids of different sizes on the surface of the bare steel bar,and pitting corrosion only existed on the surface of the coated steel bar.Thus,it is concluded that the coating had a good anti-corrosion effect on the reinforced magnesium oxychloride cement concrete.