A process for the preparation of a protective coating with a high activity against high temperature - wear of the superalloys, protective coating and thus coated parts

摘要

The method of producing a coating for protection against high temperature oxidation and corrosion when hot parts made of superalloys consists in carrying out at the surface of the superalloy, a first deposit of an alloy powder agglomerated containing at least of the chromium, aluminium and an active element, and to fill in the open porosity of the powder deposit by a second electrolytic deposition of precious metal of the placement of the plate. An appropriate heat treatment is then carried out in order to allow the interdiffusion between the base coating powder and the electrolytic coating and to obtain a coating comprising over its entire thickness of the chromium, an active element such as yttrium, and a precious metal of the platinum ore.