Abstract: A long lived, ductile, corrosion resistant coating on a superalloy body, such as a turbine vane, preferably cobalt base, is formed by electrophoretically depositing a mixture of elemental aluminum powder and chromium-aluminum alloy powder on a superalloy substrate, and diffusing the "green" coating into the substrate. By electrodepositing on and diffusing into the alloy substrate a specified mixture of aluminum and chromium-aluminum alloy, the outward diffusion of chromium and nickel from the substrate and resultant agglomeration of precipitated carbides in the diffusion layer are minimized so that ductility of the aluminum-chromium rich coating is improved.