| 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. |
| 关键词: 酸腐蚀 柠檬酸 硫酸 铝酸盐水泥 硅酸盐水泥 |
| DOI：10.3969/j.issn.1007-9629.2024.01.008 |
| 分类号:TU528.33 |
| 基金项目:国家自然科学基金资助项目（52278272，52108240）；上海市科委项目（19DZ1202702，19DZ1201404）；上海市建委专项课题（住建管2021-001-002）；上海市科委（上海市外专局）项目（22WZ2502400）；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） |
|
| Corrosion and Mechanism of Sulfuric Acid and Citric Acid Solution on Cement Hardened Paste |
|
JIN Huiling1,2, SUN Zhenping1,2,3, YANG Haijing1,2,3, MA Yuefei4, LI Zhilin5
|
|
1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China;3.Research Center of Intelligent Evaluation and Restoration Engineering Technology of Urban Pipe Network of Shanghai Water Bureau， Shanghai 201900， China;4.Ulanhot Shengyi Commercial Concrete Co.， Ltd.， Ulanhot 137400， China;5.Yunnan Fluorine Industry Environmental Protection Technology Co.， Ltd.， Kunming 650011， China
|
| Abstract: |
| 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. |
| Key words: acid corrosion citric acid sulfuric acid aluminate cement Portland cement |
