PROTECTIVE COATING

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A method of producing a coating on a substrate comprises depositing by electrolytic deposition a metal matrix M1 from a bath containing particles o f CrAlM2 so as to co-deposit the particles with the matrix, M1 being Ni or Co or Fe or two or all of these elements and M2 being Y, Si, Ti, Hf, Ta, Nb, Mn, P t, a rare earth element or two or more of these elements, the deposition being carried out at a current density of less than 3 mA per square centimetre. Preferably, the deposition forms a layer less than 50 .mu.m thick, and occur s at a bath loading of less than 40 g/l of the particles.