Studies have been carried out to determine the microhardness of the base metal, the microhardness at the fusion boundary and the deposited coating. The influencing factors of the value of the height of the protective coating of the sample on the value of microhardness are considered. Graphs of the distribution of microhardness in the base metal and the protective coating of samples by gas-powder surfacing are presented.

Keywords: microhardness, protective coatings, gas-powder surfacing, fusion boundaries