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Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Effect of Geometric Factors
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. Univ Sci & Technol Beijing, Peoples R China.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-9453-1333
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2017 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 164, no 2, C75-C84 p.Article in journal (Refereed) Published
Abstract [en]

A finite element model for simulating the propagation of intermetallic particle driven micro-galvanic corrosion in an Al-matrix model system is presented. The model revealed dynamic changes related to localized corrosion, including the moving dissolution boundary, the deposition of reaction products (Al(OH)(3)), and their blocking effect. Modelling was focused on the effects of key geometric parameters, including the radius of cathodic particle (range 0.5 to 4 mu m) and the width of an assumed anodic ring surrounding the particle (range 0.1 to 2 mu m). Simulations revealed the dynamic flow of molecular and ionic species, along with influence of geometrical constraints. For ring widths below 0.5 mu m, deposition of Al(OH)(3) inside the dissolving volume was inhibited due to limited transport of OH- and O-2 into a constrained volume - resulting in local acidification. An increase in cathodic particle radius at given ring width resulted in a greater dissolution by providing a larger cathodic area for O-2 reduction, quantifying the effect of cathode/anode ratio. The model was also developed to include two cathodic particles to explore any interaction. The present study reveals a physicochemical model that contributes toward a framework for multi-process localized corrosion systems, which can be further adapted to commercial alloy systems.

Place, publisher, year, edition, pages
ELECTROCHEMICAL SOC INC , 2017. Vol. 164, no 2, C75-C84 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-206310DOI: 10.1149/2.1221702jesISI: 000397850800024OAI: oai:DiVA.org:kth-206310DiVA: diva2:1093373
Note

QC 20170505

Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2017-05-05Bibliographically approved

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