Resumo

DIAZ GUILLEN, J. C. et al. Modificación superficial de un acero AISI 1045 mediante un proceso dúplex nitruración y post-oxidación en un plasma CD pulsado. Superf. vacío [online]. 2012, vol.25, n.3, pp.166-170. ISSN 1665-3521.

The Present work shows a study on the effect of "Pulsed Plasma Nitriding and Post-Oxidation" treatment on mechanical properties and electrochemical corrosion performance (3% NaCl solutions) of a steel AISI 1045. The effect of temperature and processing time on surface hardness, oxidized layer thickness, electrochemical corrosion rate and crystalline phases was evaluated. Results show that post oxidation treatment at 400°C during 30 minutes promotes a reduction of corrosion rate about 50% the corrosion rate of the untreated reference sample. This phenomenon is attributed to the growing of a oxide thin film (about 400 nm thickness) constituted mainly of magnetite (Fe₃O₄) on a nitrided layer compose by Fe₃N/Fe₄N. Nitriding post oxidation process increases the hardness and corrosion performance of a common steel with several applications in industy.

Palavras-chave : Plasma nitriding; Plasma oxidation; Electrochemical corrosion; Hardness.

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