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Artigo Científico | Materiais Resistentes à Corrosão | Inglês | 02/04/2002
Autores: Almir Spinelli, Aloísio Nelmo Klein, Cristiano Giacomelli, J.L.R. Muzart, José de Pinho Alves Neto
Palavras-chave: corrosion, fe-mo alloy, plasma-nitriding, powder metallurgy
Resumo: Electrochemical experiments together with SEM and X-Ray techniques were carried out in order to evaluate the corrosion resistance, to analyze the surface condition and to characterize the nitride layer of the sintered and sintered/plasma-nitrided Fe-1.5% Mo alloy in Mg(NO3)2 0.5mol.L-1 solution (pH 7.0). The sintered/plasma-nitrided samples presented a higher corrosion resistance, indicating that the surface treatment improved the electrochemical properties of the sintered material. In addition, the nitride layer formed at 500 °C showed better corrosion resistance that the layers formed at higher temperatures. This difference can be ascribed to the nitrogen content in the nitride layer, which at 500°C is higher due to the formation of a phase rich in nitrogen (e phase) while at higher temperatures a phase poor in nitrogen (g' phase) is formed.
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