Effect of mill scale on the long-term corrosion resistance of a low-alloy reinforcing steel in concrete subjected to chloride solution. (28th February 2018)

• Record Type: Journal Article
• Authors: Ming, Jing; Shi, Jinjie; Sun, Wei
• Is Part Of: Construction & building materials. Volume 163(2018)
• Page Start: 508
• Page End: 517
• Publication Date: 2018-02-28
• Subjects: Mill scale -- Low-alloy steel -- Corrosion resistance -- Corrosion products -- Steel-concrete interface -- Backscattered electron images; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.12.125
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The corrosion resistance of steel is influenced by the mill scale. Typical pitting corrosion is highlighted for pickled steels. Pickled low-alloy steel has increasing corrosion resistance after long-term exposure. Abstract: This study investigated the corrosion performance of reinforcing steels in concrete exposed to flowing 3.5 wt% NaCl solution for 4 years. Two kinds of steels were selected: low-carbon (LC) steel and low-alloy (LA) steel with alloying element Cr. Both steels were prepared with two surface conditions: as-received one (with mill scale) and pickled one (removal of the mill scale). The microstructure of the steel-concrete interface was observed to investigate the effect of steel type and surface condition on the corrosion pattern. The results reveal that the corrosion resistance and the corrosion pattern of steels were largely influenced by the feature of the mill scale.