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A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

Centre for Infrastructure Performance and Reliability, The University of Newcastle, Newcastle, NSW 2308, Australia
Corros. Mater. Degrad. 2018, 1(1), 42-58; https://doi.org/10.3390/cmd1010004
Received: 19 June 2018 / Revised: 2 July 2018 / Accepted: 17 July 2018 / Published: 18 July 2018
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Abstract

For infrastructure applications in marine environments, the eventual initiation of corrosion (and pitting) of steels (and other metals and alloys) often is assumed an inescapable fact, and practical interest then centres on the rate at which corrosion damage is likely to occur in the future. This demands models with a reasonable degree of accuracy, preferably anchored in corrosion theory and calibrated to actual observations under realistic exposure conditions. Recent developments in the understanding of the development of corrosion loss and of maximum pit depth in particular are reviewed in light of modern techniques that permit much closer examination of pitted and corroded surfaces. From these observations, and from sometimes forgotten or ignored observations in the literature, it is proposed that pitting (and crevice corrosion) plays an important role in the overall corrosion process, but that longer term pitting behaviour is considerably more complex than usually considered. In turn, this explains much of the, often high, variability in maximum depths of pits observed at any point in time. The practical implications are outlined. View Full-Text
Keywords: metal corrosion; uniform; pitting; anoxic; bi-modal; long term metal corrosion; uniform; pitting; anoxic; bi-modal; long term
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Melchers, R.E. A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures. Corros. Mater. Degrad. 2018, 1, 42-58.

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