Phase-field modeling for pH-dependent general and pitting corrosion of iron

Abstract This study proposes a new phase-field (PF) model to simulate the pH-dependent corrosion of iron. The model is formulated based on Bockris’s iron dissolution mechanism to describe the pH dependence of the corrosion rate. We also propose a simulation methodology to incorporate the thermodynam...

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Autores principales:	Chisa Tsuyuki, Akinori Yamanaka, Yasushi Ogimoto
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5beabea0207748329e7f26c59fe6a856
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spelling	oai:doaj.org-article:5beabea0207748329e7f26c59fe6a8562021-12-02T15:08:56ZPhase-field modeling for pH-dependent general and pitting corrosion of iron10.1038/s41598-018-31145-72045-2322https://doaj.org/article/5beabea0207748329e7f26c59fe6a8562018-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-31145-7https://doaj.org/toc/2045-2322Abstract This study proposes a new phase-field (PF) model to simulate the pH-dependent corrosion of iron. The model is formulated based on Bockris’s iron dissolution mechanism to describe the pH dependence of the corrosion rate. We also propose a simulation methodology to incorporate the thermodynamic database of the electrolyte solutions into the PF model. We show the applications of the proposed PF model for simulating two corrosion problems: general corrosion and pitting corrosion in pure iron immersed in an acid solution. The simulation results of general corrosion demonstrate that the incorporation of the anodic and cathodic current densities calculated by a Corrosion Analyzer software allows the PF model to simulate the migration of the corroded iron surface, the variation of ion concentrations in the electrolyte, and the electrostatic potential at various pH levels and temperatures. The simulation of the pitting corrosion indicates that the proposed PF model successfully captures the anisotropic propagation of a pit that is affected by the local pH of the electrolyte solution and the aggregation of Cl− ions in the pit.Chisa TsuyukiAkinori YamanakaYasushi OgimotoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-14 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chisa Tsuyuki Akinori Yamanaka Yasushi Ogimoto Phase-field modeling for pH-dependent general and pitting corrosion of iron
description	Abstract This study proposes a new phase-field (PF) model to simulate the pH-dependent corrosion of iron. The model is formulated based on Bockris’s iron dissolution mechanism to describe the pH dependence of the corrosion rate. We also propose a simulation methodology to incorporate the thermodynamic database of the electrolyte solutions into the PF model. We show the applications of the proposed PF model for simulating two corrosion problems: general corrosion and pitting corrosion in pure iron immersed in an acid solution. The simulation results of general corrosion demonstrate that the incorporation of the anodic and cathodic current densities calculated by a Corrosion Analyzer software allows the PF model to simulate the migration of the corroded iron surface, the variation of ion concentrations in the electrolyte, and the electrostatic potential at various pH levels and temperatures. The simulation of the pitting corrosion indicates that the proposed PF model successfully captures the anisotropic propagation of a pit that is affected by the local pH of the electrolyte solution and the aggregation of Cl− ions in the pit.
format	article
author	Chisa Tsuyuki Akinori Yamanaka Yasushi Ogimoto
author_facet	Chisa Tsuyuki Akinori Yamanaka Yasushi Ogimoto
author_sort	Chisa Tsuyuki
title	Phase-field modeling for pH-dependent general and pitting corrosion of iron
title_short	Phase-field modeling for pH-dependent general and pitting corrosion of iron
title_full	Phase-field modeling for pH-dependent general and pitting corrosion of iron
title_fullStr	Phase-field modeling for pH-dependent general and pitting corrosion of iron
title_full_unstemmed	Phase-field modeling for pH-dependent general and pitting corrosion of iron
title_sort	phase-field modeling for ph-dependent general and pitting corrosion of iron
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/5beabea0207748329e7f26c59fe6a856
work_keys_str_mv	AT chisatsuyuki phasefieldmodelingforphdependentgeneralandpittingcorrosionofiron AT akinoriyamanaka phasefieldmodelingforphdependentgeneralandpittingcorrosionofiron AT yasushiogimoto phasefieldmodelingforphdependentgeneralandpittingcorrosionofiron
_version_	1718387939471261696

Phase-field modeling for pH-dependent general and pitting corrosion of iron

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