Abstract
The influence of nitrogen plasma immersion ion implantation (N-PIII) on the corrosion mechanisms of austenitic, duplex, martensitic and ferritic stainless steels (SS) was evaluated through open circuit potential, cyclic voltammetry and electrochemical impedance spectroscopy. The nitrided SS exhibited high hardness (>1000 HV0.01) and high corrosion resistance, evidenced by transpassive potential increase and polarization resistance values on the order of 106 Ω cm2. Expanded phases developed a diffusion mechanism within the passive film of the austenitic and duplex SS, whereas iron nitrides provided a barrier against corrosion, inhibiting localized corrosion on the ferritic SS and inducing uniform corrosion on the martensitic SS.
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