Characteristics of Hard Coatings on AZ61 Magnesium Alloys

Gradient/monolithic coatings (Ti/TiCN/CrN, Ti/TiCN/TiAlN, Ti/DLC/DLC) were deposited onto magnesium alloy (Mg-Al-Zn) substrate by Cathodic Arc Evaporation method and Plasma Assisted Chemical Vapor Deposition method. A thin metallic layer (Ti) was deposited prior to deposition of gradient coatings to improve adhesion. The microstructure wear resistance and adhesion of the investigated coatings were studied. SEM micrographs showed that the deposited coatings are characterized by compact structure without delamination or defects and they closely adhere to each other. The critical load LC lies within the range of 8-17 N, depending on the coating type. The DLC coatings demonstrate the highest wear resistance. The good properties of the PVD gradient coatings make them suitable in various industrial applications.

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