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Electrochemical study on the corrosion of rusted carbon steel in dilute NaCl solutions

Electrochemical study on the corrosion of rusted carbon steel in dilute NaCl solutions Purpose – The purpose of this study was to investigate the corrosion of rusted carbon steel in dilute NaCl solution, with the purpose of exploring the effect of the rust layer on metal corrosion and establishing a corrosion model for rusted iron. Design/methodology/approach – The corrosion behavior of rusted carbon steel in dilute NaCl solution was studied by means of weight‐loss determinations, scanning electron microscopy, Raman spectrometry and electrochemical techniques. Findings – The results indicated that carbon steel had a similar corrosion behavior in all three NaCl solutions. The iron rust, which consisted of a thin γ‐FeOOH layer and a thick Fe 3 O 4 layer, can facilitate the corrosion process of carbon steel via reduction of γ‐FeOOH and the large area cathode of Fe 3 O 4 . Hence, the corrosion rate of carbon steel was accelerated significantly and finally was determined by the limiting diffusion rate of oxygen. Originality/value – A corrosion model of rusted carbon steel was established, suggesting that iron rust formed in all slightly acidic waters with low alkalinity probably promotes the corrosion of carbon steel. Anti‐corrosion measures for iron in this type of solution, such as desalination water, should be aimed to reduce the promotional effect of the rust layer on metal corrosion. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

Electrochemical study on the corrosion of rusted carbon steel in dilute NaCl solutions

Anti-Corrosion Methods and Materials , Volume 61 (3): 7 – Apr 29, 2014

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Publisher
Emerald Publishing
Copyright
Copyright © 2014 Emerald Group Publishing Limited. All rights reserved.
ISSN
0003-5599
DOI
10.1108/ACMM-05-2013-1261
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this study was to investigate the corrosion of rusted carbon steel in dilute NaCl solution, with the purpose of exploring the effect of the rust layer on metal corrosion and establishing a corrosion model for rusted iron. Design/methodology/approach – The corrosion behavior of rusted carbon steel in dilute NaCl solution was studied by means of weight‐loss determinations, scanning electron microscopy, Raman spectrometry and electrochemical techniques. Findings – The results indicated that carbon steel had a similar corrosion behavior in all three NaCl solutions. The iron rust, which consisted of a thin γ‐FeOOH layer and a thick Fe 3 O 4 layer, can facilitate the corrosion process of carbon steel via reduction of γ‐FeOOH and the large area cathode of Fe 3 O 4 . Hence, the corrosion rate of carbon steel was accelerated significantly and finally was determined by the limiting diffusion rate of oxygen. Originality/value – A corrosion model of rusted carbon steel was established, suggesting that iron rust formed in all slightly acidic waters with low alkalinity probably promotes the corrosion of carbon steel. Anti‐corrosion measures for iron in this type of solution, such as desalination water, should be aimed to reduce the promotional effect of the rust layer on metal corrosion.

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Apr 29, 2014

Keywords: Carbon steel; Dilute NaCl solution; Rust layer; Corrosion behavior; Alkalinity

References

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