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51316-7083-The Role Of Local Chemistry Changes In Repassivation Of Localized Corrosion – A Review

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Galvele introduced a new framework for localized corrosion with his seminal paper on acidification and chloride accumulation in pits & the need for a critical product of current density & pit depth to sustain this chemistry. This paper is to review the progress in these areas with a particular focus on repassivation potential.

Product Number: 51316-7083-SG
ISBN: 7083 2016 CP
Author: Narasi Sridhar
Publication Date: 2016
Industry: Science of Corrosion
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~~Galvele introduced a new quantitative framework to think about localized corrosion through his seminal paper on acidification and chloride accumulation in pits and the need for a critical product of current density and pit depth to sustain this local chemistry. This concept introduced in 1976 holds good today but has been enhanced by the ability to conduct more complex computations better modeling of concentrated solutions that could be present in local areas and the ability to perform in-situ chemical analyses in pits. The purpose of this paper is to review the progress in these areas with a particular focus on repassivation potential as a criterion for stability of localized corrosion. The paper will discuss the use of repassivation potentials as a predictor of long-term occurrence of localized corrosion of various alloys the results of different reactive-transport modeling approaches in understanding local chemistry changes during repassivation and the use of different in-situ chemical analyses in understanding localized corrosion. The focus will be primarily on Fe-Ni-Cr-Mo alloys but other alloy systems will be mentioned as needed.

 

Key words: downloadable, Localized corrosion, pitting, crevice corrosion, repassivation potential, pH, chloride, stainless steels, Ni-base alloys

~~Galvele introduced a new quantitative framework to think about localized corrosion through his seminal paper on acidification and chloride accumulation in pits and the need for a critical product of current density and pit depth to sustain this local chemistry. This concept introduced in 1976 holds good today but has been enhanced by the ability to conduct more complex computations better modeling of concentrated solutions that could be present in local areas and the ability to perform in-situ chemical analyses in pits. The purpose of this paper is to review the progress in these areas with a particular focus on repassivation potential as a criterion for stability of localized corrosion. The paper will discuss the use of repassivation potentials as a predictor of long-term occurrence of localized corrosion of various alloys the results of different reactive-transport modeling approaches in understanding local chemistry changes during repassivation and the use of different in-situ chemical analyses in understanding localized corrosion. The focus will be primarily on Fe-Ni-Cr-Mo alloys but other alloy systems will be mentioned as needed.

 

Key words: downloadable, Localized corrosion, pitting, crevice corrosion, repassivation potential, pH, chloride, stainless steels, Ni-base alloys

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