In the field of modern techniques development, which improve and/or regenerate the components surface properties, HVOF spraying of carbides or metals and its alloys is a good alternative method to other conventional surface engineering ones, including magnesium foundry alloys. Coatings manufactured by thermal spraying are used to improve the durability and life time of machine parts, both, the new and regenerated ones, by changing the surface layer properties. In this work the results of the HVOF sprayed coatings deposited onto AZ31 magnesium alloy substrate. The feeding material was composite powder Cr3C2-NiCr. The coatings were investigated in terms of their microstructure and selected mechanical properties. For structure examinations the microscopy studies (light and scanning ones) were used as well as phase composition analysis. In case of mechanical properties, the bond strength was determined also microharndess and porosity have been measured. Keywords: HVOF spraying, AZ31 substrate, microstructure, bond strength, porosity, microhardness