Modelagem computacional da corrosão por pites em aço inoxidável: efeito do potencial e de inclusões de MnS

• Autor(a) principal: Garcia, Victor Hugo Guzzo
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13824
• topic: Electrolytic corrosion Computer simulation; Stainless steel Corrosion; Computer simulation; Mathematical models; Pitting corrosion - Mathematical models; Corrosão eletrolítica Simulação por computador; Aço inoxidável Corrosão; Simulação (Computadores); Modelos matemáticos; Corrosão puntiforme Modelos matemáticos; CNPQ::CIENCIAS EXATAS E DA TERRA::MATEMATICA::MATEMATICA APLICADA

In this work is presented a computational routine to model pitting corrosion of stainless steel based on pre-existing mathematical models that take into account deterministics and stochastic effects. As contribution, modifications based on experimental results were inserted, evaluating the influence of MnS inclusions on metal surface, a typical site of major pitting nucleation. Applied potential effect was modeled, thus, it was possible to verify its influence on pitting formation and the possible range of pitting. The model consists on spatio-temporal evaluating of nucleation process, with visualization of metastable and stable pitting evolution and the anodic current transient. The results are presented in terms of variables with greatest influence on the susceptibility of pitting formation, such as concentration of aggressive species, passivity layer damage and ohmic potential drop, allowing future studies to obtains more efficient ways to combat pitting corrosion