Preliminary Studies on HVOF Sprayed Coatings on the Magnesium Alloys

In the field of modern techniques development, which improve and/or regenerate the component’s surface properties, high velocity oxy-fule spraying (HVOF) 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 wear resistance was determined also microharndess has been measured.