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A FEM model for inv...
A FEM model for investigation of micro-galvanic corrosion of Al alloys and effects of deposition of corrosion products
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- Yin, Litao (författare)
- KTH,Yt- och korrosionsvetenskap,Univ Sci & Technol Beijing, China
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Jin, Ying (författare)
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- Leygraf, Christofer (författare)
- KTH,Yt- och korrosionsvetenskap
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- Pan, Jinshan (författare)
- KTH,Yt- och korrosionsvetenskap
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(creator_code:org_t)
- Elsevier, 2016
- 2016
- Engelska.
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Ingår i: Electrochimica Acta. - : Elsevier. - 0013-4686 .- 1873-3859. ; 192, s. 310-318
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A finite element method model has been elaborated aiming at a deeper insight into the influence of microstructure on micro-galvanic corrosion of Al alloys. The model considers a dynamic corroding surface and takes into account kinetic data from local electrochemical reactions, transport of O-2 and ionic species (e.g., Al3+, H+, Cl-), homogeneous reactions in the electrolyte, deposition of reaction products and its influence on both anodic and cathodic reactions. As a first step, an Al matrix with a micrometer-sized cathodic intermetallic particle exposed in 0.1 M NaCl has been considered. The simulation predicts the dynamic changes of the corroding surface, and the flow and distribution of ionic species and of O-2 in space and time. The calculated pH of the electrolyte inside and nearby the occluded corroding volume suggests the formation of insoluble Al(OH)(3) on both the cathodic and anodic areas. This results in blocking effects of anodic and cathodic reactions and in eventual termination of the micro-galvanic corrosion. The predicted deposition of corrosion product is in good agreement with in-situ atomic force microscopy measurements.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Nyckelord
- FEM model
- Al alloy
- micro-galvanic corrosion
- deposition
- blocking effect
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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