Abstract : The objective of this work was to develop and characterize a new generation of multilayer nitride coatings, based on chromium, and understanding the mechanisms of degradation, both from a physicochemical and a tribological standpoint, to define rules for producing optimized coatings later. Because of the conditions under which they operate; these deposits must have special characteristics. Given their potential application in the field of machining, we must first consider optimizing the hardness, tribological, and thermal properties of the coatings. In addition, they must have good resistance to high temperature oxidation, due to the concomitant temperature rise from friction. We have developed and characterized multilayers coating systems : CrAlN/CrN and CrAlN/CrN/Cr. We have optimized the conditions for achieving multilayer coatings. Subsequently, the films produced under these conditions are studied and characterized. We are especially interested in their morphologies, their physicochemical and mechanical characteristics (hardness, residual stress, adhesion and tribological properties). The results found in this study contribute to the understanding of the complex damage mechanisms in multilayer coatings.