涂层钢筋氯氧镁水泥混凝土的腐蚀性研究
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摘要
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。
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 was 1/25 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.
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 was 1/25 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.
引文
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[2] Zhou Yuan,Li Lijuan,Wu Zhijian,et al.Development and comprehensive utilization of resources in Saline Lake,Qinghai[J].Progress in Chemistry,2013,25 (10):1613-1624(in Chinese).周园,李丽娟,吴志坚,等.青海盐湖资源开发及综合利用[J].化学进展,2013,25(10):1613-1624.
[3] Power I M,Dipple G M,Francis P S.Assessing the carbon sequestration potential of magnesium oxychloride cement building materials[J].Cement and Concrete Composites,2017,78:97-107.
[4] Tan Y,Liu Y,Grover L.Effect of phosphoric acid on the properties of magnesium oxychloride cement as a biomaterial[J].Cement and Concrete Research,2014,56:69-74(in Chinese).
[5] Ke Changmei,Yan Cheng,Guo Liang,et al.Preparation and properties of modified epoxy resin chrome free Dacromet coating [J].Material Protection,2012,45 (7):11-13(in Chinese).柯昌美,颜成,郭亮,等.改性环氧树脂无铬达克罗涂层的制备及性能[J].材料保护,2012,45(7):11-13.
[6] Qiao Hongxia,Gong Wei,Wang Penghui,et al.Steel bar protection test in sulfate environment magnesium oxychloride cement concrete [J].Journal of Southwest Jiao Tong University,2017,52 (2):195-201(in Chinese).乔宏霞,巩位,王鹏辉,等.硫酸盐环境氯氧镁水泥混凝土中钢筋防护试验[J].西南交通大学学报,2017,52(2):195-201.
[7] Qiao Hongxia,Liu Yao,Zhou Mingru,et al.Magnesium oxychloride cement reinforced concrete.68.Material science and technology twenty-fourth mechanical properties of axial compression members [J].Journal of Coal,2013,38(z2):337-342(in Chinese).乔宏霞,刘尧,周茗如,等.氯氧镁水泥钢筋混凝土·68·材料科学与工艺第24卷轴压构件力学性能[J].煤炭学报,2013,38(z2):337-342.
[8] Technical standard for building structural testing:GB/T50344-2004 [S].Beijing:China Architecture and Building Press,2004(in Chinese).建筑结构检测技术标准:GB/T50344-2004[S].北京:中国建筑工业出版社,2004.
[9] Cao Chunan.Principles of corrosion electrochemistry [M].Beijing:Chemical Industry Press,2008 (in Chinese).曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2008.
[10] Priya R,Mallika C,Mudali U K.Corrosion behavior of sensitized 304 SS in nitric acid medium containing oxidizing ions [J].Transactions of the Indian Institute of Metals,2014,67(4):459-467.
[11] Sadowski L,Nikoo M.Corrosion current density prediction in reinforced concrete by imperialist competitive algorithm[J].Neural Computing and Applications,2014,25(7-8):1627-1638.
[12] Lu Yiyan,Qi Bo,Li Shan,et al.Electrochemical characteristics of reinforced concrete corroded by FRP reinforced concrete [J].Journal of Huazhong University of Science and Technology:Natural Science Edition,2015,43 (1):34-38(in Chinese).卢亦焱,齐波,李杉,等.FRP加固混凝土柱钢筋锈蚀电化学特性[J].华中科技大学学报:自然科学版,2015,43(1):34-38.
[13] Ghosh A,Goswami P,Mahanta P,et al.Effect of carbon fiber length and graphene on carbon-polymer composite bipolar plate for PEMFC[J].Journal of Solid State Electrochemistry,2014,18(12):3427-3436.
[14] Liu Huilan,Huang Yan,Han Yunping.Study on the erosion of environmental water to mortar and concrete [J].Concrete and Cement Products,1997(6):12-15(in Chinese).刘惠兰,黄艳,韩云屏.环境水对砂浆、混凝土的侵蚀性研究[J].混凝土与水泥制品,1997(6):12-15.
[15] Rybalka K V,Beketaeva L A,Davydov A D.Determination of corrosion current in general corrosion under the conditions of mixed kinetics[J].Russian Journal of Electrochemistry,2014,50(4):390-394.
[16] Zhang Cuimiao,Yang Hongjian,Ma Xuejing.Research progress of magnesium oxychloride cement [J].Bulletin of Silicate,2014,33(1):117-121(in Chinese).张翠苗,杨红健,马学景.氯氧镁水泥的研究进展[J].硅酸盐通报,2014,33(1):117-121.
[17] Wang Jinlei.Mix design and experimental study of magnesium oxychloride cement concrete [D].Lanzhou:Lanzhou University of Technology,2015(in Chinese).王金磊.氯氧镁水泥混凝土配合比设计及其试验研究[D].兰州:兰州理工大学,2015.
[18] Run Zhenjia,He Yanjun.Magnesium oxychloride cement modification and practical production technology [M].Beijing:Chemical Industry Press,2006:10-15(in Chinese).闰振甲,何艳君.氯氧镁水泥改性及制品生产实用技术[M].北京:化学工业出版社,2006:10-15.
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