Tratamentos termoquímicos a plasma em a？os carbono

in this work plasma thermochemical surface treatments of nitriding, nitrocarburising and nitrocarburising plus post-oxidation have been done. the treatments were made on aisi 1010 and 1020 mild steels. to investigate the influence of the process parameters on the mechanical properties and corrosion resistance, the samples were treated at three temperatures, the time was varied from 10 to 60 min and three different gas concentrations were used. the corrosion resistance was evaluated by salt-spray fog, electrochemical and mass loss in acid solution tests. the samples were also characterized by micro hardness testing. the results revealed interesting features, for instance, the excellent corrosion resistance combined with high surface hardness.