Corrosion behavior of low-temperature enamel (LTE) coating in simulated concrete pore solutions: For rebar protection applications

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

Construction and Building Materials Pub Date : 2025-03-29 DOI:10.1016/j.conbuildmat.2025.140933

Shenhao Ye , Shusen Wang , Zefeng Liu , Long Ju , Hao Qian , Yi Liu , Dongming Yan

{"title":"Corrosion behavior of low-temperature enamel (LTE) coating in simulated concrete pore solutions: For rebar protection applications","authors":"Shenhao Ye , Shusen Wang , Zefeng Liu , Long Ju , Hao Qian , Yi Liu , Dongming Yan","doi":"10.1016/j.conbuildmat.2025.140933","DOIUrl":null,"url":null,"abstract":"<div><div>Rebar corrosion leads to the volume expansion of the steel, causing concrete cracking and accelerating the degradation of reinforced concrete structures. Surface coating is one of the most prevalent ways to protect rebar from corrosion, and low-temperature enamel (LTE) coating has garnered a lot of attention in recent years. In this study, the corrosion behavior and corrosion protection performance of LTE coating in different simulated concrete pore solutions were investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FTIR), and electrochemical tests (electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR)). The fresh, chloride-contaminated, and carbonated concrete conditions, as well as LTE coatings with varied degrees of damage, were considered. Results indicated that the white precipitate, composed of Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>OH, CaF<sub>2</sub>, and CaCO<sub>3</sub>, was closely related to the corrosion of LTE coating in saturated Ca(OH)<sub>2</sub> solution, and the Cl<sup>-</sup> (as a catalyst) greatly promoted the generation of white precipitate. The total corrosion resistance of LTE-coated rebar was affected by both LTE coating corrosion degradation and white precipitate enhancement, which was much superior to that of uncoated rebar over the entire immersion ages. The findings of this study clarified the corrosion mechanism of LTE-coated rebars in simulated concrete pore solutions and evaluated their corrosion resistance.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"473 ","pages":"Article 140933"},"PeriodicalIF":7.4000,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061825010815","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}

引用次数: 0

Abstract

Rebar corrosion leads to the volume expansion of the steel, causing concrete cracking and accelerating the degradation of reinforced concrete structures. Surface coating is one of the most prevalent ways to protect rebar from corrosion, and low-temperature enamel (LTE) coating has garnered a lot of attention in recent years. In this study, the corrosion behavior and corrosion protection performance of LTE coating in different simulated concrete pore solutions were investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FTIR), and electrochemical tests (electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR)). The fresh, chloride-contaminated, and carbonated concrete conditions, as well as LTE coatings with varied degrees of damage, were considered. Results indicated that the white precipitate, composed of Ca₅(PO₄)₃OH, CaF₂, and CaCO₃, was closely related to the corrosion of LTE coating in saturated Ca(OH)₂ solution, and the Cl^- (as a catalyst) greatly promoted the generation of white precipitate. The total corrosion resistance of LTE-coated rebar was affected by both LTE coating corrosion degradation and white precipitate enhancement, which was much superior to that of uncoated rebar over the entire immersion ages. The findings of this study clarified the corrosion mechanism of LTE-coated rebars in simulated concrete pore solutions and evaluated their corrosion resistance.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.