resumo
In this paper a mechanistic model is elaborated to simulate the corrosion behavior of aluminum-zinc-magnesium coatings on steel. The model is based on the mass transport and reactions of the ions in the electrolyte (MITReM). The finite element method has been used, which allows to perform time-dependent simulations with micrometer scale to study local corrosion effects. The formation of corrosion products and the prediction of electrolyte concentration distributions are compared for different metallic coating compositions. The spatial and temporal simulation of complex precipitates provides an additional tool to validate the model through corrosion product characterization. The simulation results are compared to experimental observations, presented in part I of this paper. The MITReM simulations are limited to the micro-scale and therefore to small geometries. A link is made with the potential model which can be applied on macro-scale objects. A qualitative agreement is found between the simulations at both scales and the experiments. Further quantification of this model would optimize the simulations for material design and for predictive maintenance.
palavras-chave
ATMOSPHERIC CORROSION; MODEL; ELECTRODE; LAYER; IRON
categoria
Materials Science; Metallurgy & Metallurgical Engineering
autores
Dolgikh, O; Simillion, H; Lamaka, SV; Bastos, AC; Xue, HBB; Taryba, MG; Oliveira, AR; Allely, C; Van den Bossche, B; Van den Bergh, K; De Strycker, J; Deconinck, J
nossos autores
André Raposo Bastos de Oliveira
Bolseiro de investigação
António Alexandre Cunha Bastos
Investigadoragradecimentos
This work has been carried out in the frame of the RFCS project AtCorAS Modeling of atmospheric corrosion of steel protected by aluminium based alloys, applied by hot dip processing (RFSR-CT-2011-00015).