Abstract

In this work, tests of micro adhesive wear and corrosion by potentiodynamic polarization in chromium-based coatings produced by thermal spray (HVOF - Cr₃C₂-NiCr alloy) and hard chromium (electrolytic) were performed. The electrolyte used in the tests was natural sea water (Riviera - Bertioga beach / São Paulo - Brazil). In the wear and potentiodynamic polarization curves of the Cr₃C₂-NiCr layers produced by thermal spraying and electrolytic Cr, there was a higher resistance to wear and corrosion for the material obtained by thermal spraying. Therefore, the Cr₃C₂-NiCr layer, having a higher resistance to wear and corrosion, when compared to the electrolytic Cr layer, allows the substitution of this highly polluting and carcinogenic process due to the presence of the Cr⁺⁶ ion and with increasing restriction manufacturing.

Keywords:Coatings; Thermal spray; Hard chrome; Micro adhesive wear test; Potentiodynamic Polarization