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Electrochemical behavior and corrosion products of Cr-modified reinforcing steels in saturated Ca(OH)2 solution with chlorides
https://orcid.org/0000-0003-2814-3487
Abstract In this paper, the evolution of natural passivation and chloride-induced corrosion, pitting corrosion resistance and corrosion products composition of two Cr-modified reinforcing steels and the low-carbon (LC) reinforcing steel in saturated Ca(OH)2 solution with chlorides were evaluated by a combined electrochemical measurements (E corr, LPR, EIS, CV and CPP) and surface analysis techniques (XPS, Raman, FT-IR, and SEM/EDS). The passive films enriched with Cr oxides/hydroxides were formed for Cr-modified steels, resulting in higher passivation capability and corrosion resistance than those of LC steel at natural passivation stage and chloride-induced corrosion stage, respectively. Also, it was confirmed that after chloride exposure, β-FeOOH was widely identified on the outer surface of LC steel, while γ-FeOOH was mainly pronounced for Cr-modified steels. Moreover, compared with LC steel, higher pitting corrosion resistance was evident for Cr-modified steels with various chloride concentrations. Finally, the mechanisms of natural passivation and chloride-induced pitting corrosion for steels in saturated Ca(OH)2 solution were proposed.
Highlights Cr-modified reinforcing steels with different Cr contents were developed for potential application in concrete. The composition of passive films and corrosion products for Cr-modified reinforcing steels was comprehensively investigated. The mechanisms of the formation of passive films and corrosion pits for Cr-modified reinforcing steels were proposed.
Electrochemical behavior and corrosion products of Cr-modified reinforcing steels in saturated Ca(OH)2 solution with chlorides
https://orcid.org/0000-0003-2814-3487
Abstract In this paper, the evolution of natural passivation and chloride-induced corrosion, pitting corrosion resistance and corrosion products composition of two Cr-modified reinforcing steels and the low-carbon (LC) reinforcing steel in saturated Ca(OH)2 solution with chlorides were evaluated by a combined electrochemical measurements (E corr, LPR, EIS, CV and CPP) and surface analysis techniques (XPS, Raman, FT-IR, and SEM/EDS). The passive films enriched with Cr oxides/hydroxides were formed for Cr-modified steels, resulting in higher passivation capability and corrosion resistance than those of LC steel at natural passivation stage and chloride-induced corrosion stage, respectively. Also, it was confirmed that after chloride exposure, β-FeOOH was widely identified on the outer surface of LC steel, while γ-FeOOH was mainly pronounced for Cr-modified steels. Moreover, compared with LC steel, higher pitting corrosion resistance was evident for Cr-modified steels with various chloride concentrations. Finally, the mechanisms of natural passivation and chloride-induced pitting corrosion for steels in saturated Ca(OH)2 solution were proposed.
Highlights Cr-modified reinforcing steels with different Cr contents were developed for potential application in concrete. The composition of passive films and corrosion products for Cr-modified reinforcing steels was comprehensively investigated. The mechanisms of the formation of passive films and corrosion pits for Cr-modified reinforcing steels were proposed.
Electrochemical behavior and corrosion products of Cr-modified reinforcing steels in saturated Ca(OH)2 solution with chlorides
https://orcid.org/0000-0003-2814-3487
Abstract In this paper, the evolution of natural passivation and chloride-induced corrosion, pitting corrosion resistance and corrosion products composition of two Cr-modified reinforcing steels and the low-carbon (LC) reinforcing steel in saturated Ca(OH)2 solution with chlorides were evaluated by a combined electrochemical measurements (E corr, LPR, EIS, CV and CPP) and surface analysis techniques (XPS, Raman, FT-IR, and SEM/EDS). The passive films enriched with Cr oxides/hydroxides were formed for Cr-modified steels, resulting in higher passivation capability and corrosion resistance than those of LC steel at natural passivation stage and chloride-induced corrosion stage, respectively. Also, it was confirmed that after chloride exposure, β-FeOOH was widely identified on the outer surface of LC steel, while γ-FeOOH was mainly pronounced for Cr-modified steels. Moreover, compared with LC steel, higher pitting corrosion resistance was evident for Cr-modified steels with various chloride concentrations. Finally, the mechanisms of natural passivation and chloride-induced pitting corrosion for steels in saturated Ca(OH)2 solution were proposed.
Highlights Cr-modified reinforcing steels with different Cr contents were developed for potential application in concrete. The composition of passive films and corrosion products for Cr-modified reinforcing steels was comprehensively investigated. The mechanisms of the formation of passive films and corrosion pits for Cr-modified reinforcing steels were proposed.
Electrochemical behavior and corrosion products of Cr-modified reinforcing steels in saturated Ca(OH)2 solution with chlorides
Shi, Jinjie (author) / Ming, Jing (author) / Wu, Miao (author)
2020-03-09
Article (Journal)
Electronic Resource
English
On the corrosion of reinforcing steels in concrete in the presence of chlorides
| DOAJ | 1986
| British Library Online Contents | 2014