Cr/CrN bilayer coating was deposited on AISI 440C by Cathodic Arc.The composition and structure of the Cr/CrN coating were investigated by scanning Electron Microscope, X-Ray Diffraction and X-ray Photoelectron Spectroscopy.The results show that crystal structure obtained was CrN phase with preferred [220] orientation.The hardness and adhesion of coating also were studied.The evaluation of erosion-corrosion (EC) on 440C bare and coated with Cr/CrN was performed by carrying out wear tests using a slurry jet with impingement angle 90° at 4 and 8 m/s.Corrosion, erosion and synergism wear rate were evaluated following the procedure described in ASTM G-119-09.This study presents that the synergism wear rate exceeds 40% of the total mass loss for coating and 60% of mass loss for the 440C, being the most aggressive wear component.The increase in impact velocity generated a rise in mass loss for both 440C bare and coated.The Cr/CrN coating offers better corrosion and erosion-corrosion resistance under all the tested conditions.