Abstract
Plasma nitrocarburized AISI 1020 steels are oxidized for 15, 30 and 60 min to evaluate the effect of post-oxidizing time on corrosion behavior. After plasma nitrocarburizing for 3 h at 570 °C, the compound layer composed of ε-Fe2–3(N,C) and γ′-Fe4(N,C) phases and the diffusion layer above the matrix are observed. The oxide top layer, mainly consisting of magnetite (Fe3O4) and hematite (Fe2O3) phases, is formed after post-oxidation treatment at 500 °C. However, the oxide layer is degraded severely by spallation as a result of the prolonged oxygen plasma bombardment as the post-oxidizing time increases. The difference in corrosion resistance is mainly attributed to the thickness of the oxide top layer, which is governed by the post-oxidizing time.
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