{"title":"Inconel 625 在不同 pH 值的 OPC 和 CSA 混凝土孔隙溶液中的自然钝化和耐氯化物腐蚀性能","authors":"Shuwen Shao , Mingzhi Guo , Yan Zhang","doi":"10.1016/j.cemconcomp.2024.105794","DOIUrl":null,"url":null,"abstract":"<div><div>This study considers the different engineering application environments for normal use and emergency repair of reinforced concrete structures. The natural passivation and chloride corrosion resistance of Inconel 625 in Ordinary Portland cement (OPC) and Calcium Sulfoaluminate cement (CSA) was first evaluated through electrochemical measurement and surface analysis techniques. OPC and CSA related to different pH values of pore solutions were selected while low carbon (LC) steel and 304 stainless steels (304SS) were also investigated as reference. The electrochemical test results showed that the passivation ability of 304SS and Inconel 625 in CSA solution was as well as or better than that in OPC solution, while LC steel could hardly be passivated in CSA solution. In addition, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) results indicated that the thickness and integrity of the Inconel 625 passivation film were lower than that of 304SS. Notably, the thicknesses of Inconel 625 and 304SS in CSA solution are 4.6 nm and 5.2 nm, respectively. However, the corrosion resistance of Inconel 625 in chloride environments was significantly better than that of 304SS, which was attributed to the presence of highly corrosion-resistant Cr, Ni, and Mo compounds on the surface of Inconel 625 passivation film. Finally, based on the research results, the passivation and chloride corrosion resistance mechanism of Inconel 625 in OPC and CSA solutions was proposed, which may provide a reference and theoretical basis for the application of Inconel 625 in cement-based materials. In particular, the introduction of Inconel 625 is of great significance in improving the durability of concrete structures for emergency construction projects using CSA in complex and harsh environments.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105794"},"PeriodicalIF":10.8000,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Natural passivation and chloride corrosion resistance of Inconel 625 in OPC and CSA concrete pore solutions with different pH\",\"authors\":\"Shuwen Shao , Mingzhi Guo , Yan Zhang\",\"doi\":\"10.1016/j.cemconcomp.2024.105794\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study considers the different engineering application environments for normal use and emergency repair of reinforced concrete structures. The natural passivation and chloride corrosion resistance of Inconel 625 in Ordinary Portland cement (OPC) and Calcium Sulfoaluminate cement (CSA) was first evaluated through electrochemical measurement and surface analysis techniques. OPC and CSA related to different pH values of pore solutions were selected while low carbon (LC) steel and 304 stainless steels (304SS) were also investigated as reference. The electrochemical test results showed that the passivation ability of 304SS and Inconel 625 in CSA solution was as well as or better than that in OPC solution, while LC steel could hardly be passivated in CSA solution. In addition, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) results indicated that the thickness and integrity of the Inconel 625 passivation film were lower than that of 304SS. Notably, the thicknesses of Inconel 625 and 304SS in CSA solution are 4.6 nm and 5.2 nm, respectively. However, the corrosion resistance of Inconel 625 in chloride environments was significantly better than that of 304SS, which was attributed to the presence of highly corrosion-resistant Cr, Ni, and Mo compounds on the surface of Inconel 625 passivation film. Finally, based on the research results, the passivation and chloride corrosion resistance mechanism of Inconel 625 in OPC and CSA solutions was proposed, which may provide a reference and theoretical basis for the application of Inconel 625 in cement-based materials. In particular, the introduction of Inconel 625 is of great significance in improving the durability of concrete structures for emergency construction projects using CSA in complex and harsh environments.</div></div>\",\"PeriodicalId\":9865,\"journal\":{\"name\":\"Cement & concrete composites\",\"volume\":\"154 \",\"pages\":\"Article 105794\"},\"PeriodicalIF\":10.8000,\"publicationDate\":\"2024-10-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Cement & concrete composites\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0958946524003676\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cement & concrete composites","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0958946524003676","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Natural passivation and chloride corrosion resistance of Inconel 625 in OPC and CSA concrete pore solutions with different pH
This study considers the different engineering application environments for normal use and emergency repair of reinforced concrete structures. The natural passivation and chloride corrosion resistance of Inconel 625 in Ordinary Portland cement (OPC) and Calcium Sulfoaluminate cement (CSA) was first evaluated through electrochemical measurement and surface analysis techniques. OPC and CSA related to different pH values of pore solutions were selected while low carbon (LC) steel and 304 stainless steels (304SS) were also investigated as reference. The electrochemical test results showed that the passivation ability of 304SS and Inconel 625 in CSA solution was as well as or better than that in OPC solution, while LC steel could hardly be passivated in CSA solution. In addition, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) results indicated that the thickness and integrity of the Inconel 625 passivation film were lower than that of 304SS. Notably, the thicknesses of Inconel 625 and 304SS in CSA solution are 4.6 nm and 5.2 nm, respectively. However, the corrosion resistance of Inconel 625 in chloride environments was significantly better than that of 304SS, which was attributed to the presence of highly corrosion-resistant Cr, Ni, and Mo compounds on the surface of Inconel 625 passivation film. Finally, based on the research results, the passivation and chloride corrosion resistance mechanism of Inconel 625 in OPC and CSA solutions was proposed, which may provide a reference and theoretical basis for the application of Inconel 625 in cement-based materials. In particular, the introduction of Inconel 625 is of great significance in improving the durability of concrete structures for emergency construction projects using CSA in complex and harsh environments.
期刊介绍:
Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.