CSA-OPC基修补材料的耐海水腐蚀性及其机理研究  

Corrosion Resistance and Mechanism of CSA-OPC Based Repair Materials in Artificial Seawaters

作　　者：李国新[1] 陈华湘 伍扬帆 LI Guoxin;CHEN Huaxiang;WU Yangfan(School of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《中国腐蚀与防护学报》2024年第2期462-470,共9页Journal of Chinese Society For Corrosion and Protection

摘　　要：采用实验室加速腐蚀模拟实验,研究硫铝酸盐水泥-普通硅酸盐水泥基修补材料(CSA-OPC体系)在NaCl、NaCl+Na_(2)SO_(4)、NaCl+Na_(2)SO_(4)+MgCl_(2)腐蚀溶液以及干-湿循环耦合作用下,其质量、抗压强度、粘结强度及Cl^(-)含量的变化规律,并用X射线衍射(XRD)和扫描电子显微镜(SEM)进行微观表征,探究不同OPC掺量下的CSA-OPC体系的耐海水腐蚀性能及其机理,揭示海洋环境中不同腐蚀性离子间的交互作用。结果表明:在NaCl、NaCl+Na_(2)SO_(4)、NaCl+Na_(2)SO_(4)+MgCl_(2)腐蚀溶液环境下,适量OPC的掺入能明显改善CSA的耐海水腐蚀性能,当OPC掺量为20%~30%时,CSA-OPC体系的质量变化、抗压强度、粘结强度、Cl^(-)结合能力最佳,Cl^(-)进入体系通过生成Friedel's盐被固化,SO_(4)^(2-)会抑制Cl^(-)的结合,Mg^(2+)会消耗更多OH-,降低Cl^(-)的结合率。Several sulfoaluminate cement-ordinary Portland cement-based repair materials(CSAOPC)were prepared,then their corrosion resistance in artificial seawaters containing NaCl,NaCl+Na_(2)SO_(4),NaCl+Na_(2)SO_(4)+MgCl_(2)respectively were assessed via dry-wet cycle test,X-ray diffractometer(XRD)and scanning electron microscopy(SEM).The study focuses on the evolution of mass,compressive strength,bond strength and Cl^(-)content of the CSA-OPC with the variation of OPC content and corrosion process.The results show that in the test conditions with solutions of NaCl,NaCl+Na_(2)SO_(4),NaCl+Na_(2)SO_(4)+MgCl_(2),an appropriate amount of OPC incorporation can significantly improve the corrosion resistance of CSA in artificial seawaters.When the content of OPC is 20%-30%,the mass change,compressive strength,bond strength and Cl^(-)combination ability of CSA-OPC are the best.The Cl^(-)infiltrated into the CSA-OPC materials are trapped through the formation of Friedel's salt,while the SO_(4)^(2-)may inhibit the combination of Cl^(-),and Mg^(2+)may reduce the combination rate of Cl^(-)by consuming more OH-.

关 键 词：海洋潮汐区 离子耦合腐蚀 修补材料 硫铝酸盐水泥 普通硅酸盐水泥 

分 类 号：TU525[建筑科学—建筑技术科学]