Details

Autor(en) / Beteiligte

• Shi, Jinjie
• Ming, Jing
• Wu, Miao

Titel

Electrochemical behavior and corrosion products of Cr-modified reinforcing steels in saturated Ca(OH)2 solution with chlorides

Ist Teil von

• Cement & concrete composites, 2020-07, Vol.110, p.103587, Article 103587

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 (Ecorr, 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. •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.