Tecnologia em Metalurgia, Materiais e Mineração
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

Evaluation of plasma nitriding process in the wear resistance of 7075 aluminum alloy

Maria Gabriela Galvão Camarinha; Leticia Oliveira Rocha; Miguel Justino Ribeiro Barboza; Gislene Valdete Martins; Marcos Massi; Argemiro Soares Silva; Douglas Marcel Gonçalves Leite; Danieli Aparecida Pereira Reis

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AlZnMgCu alloys are widely used in aerospace industry owing to their high mechanical strength, low density and good formability. However, these alloys have low hardness surface and chemical stability. The plasma nitriding is an alternative process of raising the tribological behavior of the materials. Thus, the main purpose of this paper is to investigate its effect in wear resistance of 7075 aluminum alloy. The 7075 – T6 aluminum alloy were nitrided via direct current plasma at temperatures ranging from 300 to 450 °C and pressure ranging from 0.6 to 0.9 Torr. The influence of nitriding process parameters such as gas mixture, pressure, temperature, and treatment time on the characteristic of nitrided layer were analyzed using X-ray diffraction (XDR), mechanical profilometry and scratch test. The results showed that aluminium nitride (AIN) layers covered totally the substrates, and suggest that, among all treatment conditions explored in this work, the nitriding condition at 450 °C, 0.9 Torr, for 180 minutes was the most satisfactory, because the layer produced is less roughness and presents lower friction coefficient and higher critical load (LC).


Plasma nitriding; Aluminum alloy; AlN; AA7075; Scratch test


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