硫酸和柠檬酸溶液对水泥硬化浆体的腐蚀及机理  

Corrosion and Mechanism of Sulfuric Acid and Citric Acid Solution on Cement Hardened Paste

作　　者：金惠玲 孙振平[1,2,3] 杨海静 马跃飞[4] 李志林 JIN Huiling;SUN Zhenping;YANG Haijing;MA Yuefei;LI Zhilin(Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;Research Center of Intelligent Evaluation and Restoration Engineering Technology of Urban Pipe Network of Shanghai Water Bureau,Shanghai 201900,China;Ulanhot Shengyi Commercial Concrete Co.,Ltd.,Ulanhot 137400,China;Yunnan Fluorine Industry Environmental Protection Technology Co.,Ltd.,Kunming 650011,China)

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804 [2]同济大学材料科学与工程学院,上海201804 [3]上海市水务局城市管网智能评估与修复工程技术研究中心,上海201900 [4]乌兰浩特市圣益商砼有限公司,内蒙古乌兰浩特137400 [5]云南氟业环保科技股份有限公司,云南昆明650011

出　　处：《建筑材料学报》2024年第1期58-66,共9页Journal of Building Materials

基　　金：国家自然科学基金资助项目(52278272,52108240);上海市科委项目(19DZ1202702,19DZ1201404);上海市科委(上海市外专局)项目(22WZ2502400);上海市建委专项课题(住建管2021-001-002);重庆市科技局专项项目(cstc2020kqjscx-phxm1594);内蒙古自治区科技计划项目(2022YFDZ0063);云南省科技厅专家工作站项目(202105AF150243)。

摘　　要：通过分析砂浆的外观、质量损失率和耐蚀系数,结合X射线衍射(XRD)、扫描电镜(SEM)和元素能谱分析(EDS)等微观测试手段,对比研究了硅酸盐水泥、铝酸盐水泥浆体在硫酸、柠檬酸溶液中的腐蚀规律与机理.结果表明:与硫酸溶液相比,柠檬酸溶液对两种水泥砂浆的腐蚀能力更强;与硅酸盐水泥相比,铝酸盐水泥表现出了较好的耐酸腐蚀性能,主要原因在于铝酸盐水泥硬化浆体中含有大量铝胶,在硫酸溶液中能够中和更多H+,在柠檬酸溶液中能够延缓H+向硬化浆体内部扩散的速率.The corrosion laws and the mechanisms of Portland cement hardened paste and aluminate cement hardened paste in sulfuric acid and citric acid solutions were studied by analyzing the appearance change of mortar,measuring the mass loss rate and corrosion resistance coefficient of mortar in acid solutions combined with X⁃ray diffraction(XRD),scanning electron microscopy(SEM)and elemental energy spectroscopy(EDS).The results show that compared with sulfuric acid solution,citric acid solution has stronger corrosion ability for two cement mortars.Compared with Portland cement,aluminate cement shows better acid corrosion resistance,mainly because the hardened paste of aluminate cement contains a large amount of aluminum glue,which can neutralize more H+in sulfuric acid solution and delay the diffusion rate of H+to the inside of the hardened paste in citric acid solution.

关 键 词：酸腐蚀 柠檬酸 硫酸 铝酸盐水泥 硅酸盐水泥 

分 类 号：TU528.33[建筑科学—建筑技术科学]