Microscopic investigation of mill scale and its proposed effect on the variability of chloride-induced depassivation of carbon steel rebar

被引：76

作者：

Ghods, P. ^{[1
]}

Isgor, O. B. ^{[1
]}

McRae, G. A. ^{[1
]}

Li, J. ^{[2
]}

Gu, G. P. ^{[2
]}

机构：

[1] Carleton Univ, Ottawa, ON K1S 5B6, Canada

[2] CANMET Mat Technol Lab, Ottawa, ON, Canada

来源：

CORROSION SCIENCE | 2011年 / 53卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Steel reinforced concrete; SEM; Crevice corrosion; Pitting corrosion; Alkaline corrosion; REINFORCEMENT CORROSION; THRESHOLD; CONCRETE; SURFACE;

D O I：

10.1016/j.corsci.2010.11.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electrochemical experiments have shown that mill scale on carbon steel rebar affects corrosion initiation and variability associated with chloride-induced depassivation thresholds. In this study, scanning electron microscopy and focused ion beam microscopy were used to investigate the properties of mill scale and its effect on chloride thresholds of the underlying steel. The variability found in the literature for chloride thresholds is suggested to result, in part, from the variability in the physical and chemical properties of mill scale. A crevice corrosion mechanism is proposed to explain why as-received rebar is more susceptible to depassivation than rebar without mill scale. (c) 2010 Elsevier Ltd. All rights reserved.

引用

页码：946 / 954

页数：9

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