Corrosion resistance of low-alloy steel in concrete subjected to long-term chloride attack: Characterization of surface conditions and rust layers. (15th July 2022)

• Record Type: Journal Article
• Authors: Ming, Jing; Zhou, Xiaocheng; Jiang, Linhua; Shi, Jinjie
• Is Part Of: Corrosion science. Volume 203(2022)
• Publication Date: 2022-07-15
• Subjects: Low-alloy steel -- Concrete -- Surface conditions -- Rust layers -- Corrosion resistance -- Chloride attack; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110370
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Long-term corrosion behavior of a Cr-bearing low-alloy (LA) steel with different surface conditions (as-received, pickled and pre-rusted) in concrete when partially exposed to 3.5 wt% NaCl solution was measured using electrochemical impedance spectroscopy during the 8-year exposure period. According to the results of BSE/EDS elemental mapping, FT-IR and XPS measurements, the morphology and composition of different rust layers were identified for LA steel. The improved corrosion resistance of LA steel was primarily attributed to the formation of a compact and protective inner rust layer enriched with Cr and Si, which can be further protected by the mill scale. Highlights: Long-term corrosion behavior of LA steel was affected by the steel surface conditions. A compact and protective inner rust layer enriched with Cr and Si was formed for LA steel. The role of mill scale in the formation of a stable and thick inner rust layer was identified.