Natural passivation and chloride corrosion resistance of Inconel 625 in OPC and CSA concrete pore solutions with different pH

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-10-10 DOI:10.1016/j.cemconcomp.2024.105794

Shuwen Shao , Mingzhi Guo , Yan Zhang

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引用次数: 0

Abstract

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.

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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

本研究考虑了钢筋混凝土结构正常使用和紧急维修的不同工程应用环境。首先通过电化学测量和表面分析技术评估了 Inconel 625 在普通硅酸盐水泥（OPC）和硫铝酸钙水泥（CSA）中的自然钝化和耐氯化物腐蚀性能。选择了与孔隙溶液不同 pH 值相关的 OPC 和 CSA，同时还研究了低碳钢 (LC) 和 304 不锈钢 (304SS) 作为参考。电化学测试结果表明，304SS 和 Inconel 625 在 CSA 溶液中的钝化能力与在 OPC 溶液中的钝化能力相当或更好，而 LC 钢在 CSA 溶液中几乎不能被钝化。此外，X 射线光电子能谱（XPS）和原子力显微镜（AFM）结果表明，Inconel 625 钝化膜的厚度和完整性均低于 304SS。值得注意的是，Inconel 625 和 304SS 在 CSA 溶液中的厚度分别为 4.6nm 和 5.2nm。然而，Inconel 625 在氯化物环境中的耐腐蚀性明显优于 304SS，这归因于 Inconel 625 钝化膜表面存在高耐腐蚀性的 Cr、Ni 和 Mo 化合物。最后，根据研究结果，提出了 Inconel 625 在 OPC 和 CSA 溶液中的钝化和抗氯化物腐蚀机理，可为 Inconel 625 在水泥基材料中的应用提供参考和理论依据。特别是在复杂恶劣环境下使用 CSA 的应急建设项目中，引入 Inconel 625 对提高混凝土结构的耐久性具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

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.