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Towards the Modeling of Microgalvanic Corrosion in Aluminum Alloys: the Choice of Boundary Conditions
Publié en 2008
Aluminum alloys in near-neutral, mildly aggressive solutions, undergo damage accumulation during corrosion, mostly due to the presence of micrometer-sized constituent intermetallic particles (IMP) that create a microstructural discontinuity at which localized corrosion occurs.
The Nernst-Planck equation with electroneutrality is used to simulate current and pH distributions resulting from microgalvanic coupling in COMSOL.
Assuming a control of the cathodic reaction by O2, diffusion has been shown to provide a simulated coupling current density distribution very similar to the experimental distribution measured on an array of Cu islands deposited on Al matrix.
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