SO42 −/Cl−和Cr/RE元素对钢筋在模拟碳化混凝土孔隙溶液中耐蚀性的多重耦合机制

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-05-26 DOI:10.1016/j.conbuildmat.2025.141957

Tianqi Chen , Xun Zhou , Shasha Zhang , Yuzhou Du , Jiangtao Chen , Xuequn Cheng , Xiaogang Li , Chao Liu

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引用次数: 0

摘要

本研究提出了SO42−/Cl−和Cr/稀土（RE）元素对模拟碳化混凝土孔隙溶液中钢筋耐蚀性的多重耦合机制。随着硫酸盐浓度的增加，腐蚀电流密度增大，但腐蚀坑的平均深度减小，这是由于SO42−- Cl−的竞争性吸附，导致局部腐蚀向均匀腐蚀转变。RE与硫酸盐Cr之间存在耦合作用，RE与硫酸盐形成不溶性盐，阻断腐蚀介质；在锈层内的成核和生长之间的竞争动态中，稀土赋予了铬氧化物成核的优势。

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Insights into multiple coupling mechanisms of SO42 −/Cl− and Cr/RE elements on the corrosion resistance of rebar in simulated carbonated concrete pore solution

This study proposes a novel multiple coupling mechanisms of SO₄²⁻/Cl⁻ and Cr/rare earth (RE) elements on rebar corrosion resistance in simulated carbonated concrete pore solution. Increasing sulfate concentration increases the corrosion current density but decreases the average depth of the corrosion pits, ascribed to the competitive SO₄²⁻- Cl⁻ adsorption, leading to a transition from localized to uniform corrosion. There is coupling between RE and sulfate, Cr. Specifically, RE and sulfate form an insoluble salt to block the corrosive medium; RE confers a nucleation advantage to Cr oxides amidst the competitive dynamics between nucleation and growth within the rust layer.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.

SO42 −/Cl−和Cr/RE元素对钢筋在模拟碳化混凝土孔隙溶液中耐蚀性的多重耦合机制

摘要

SO42 −/Cl−和Cr/RE元素对钢筋在模拟碳化混凝土孔隙溶液中耐蚀性的多重耦合机制