A method for the deposition of a film of a manganese/cobalt mixed oxide on a metallic substrate

The invention relates to a method for the formation of a protective film comprising a spinel of formula MnCoO, where x+y=3, on a metallic substrate, characterised in that it comprises the steps of: a) depositing on the substrate manganese and cobalt as metal species in a molar ratio x/y corresponding to the above-mentioned formula by thermal co-evaporation; and b) oxidisingin situthe metal species to form the spinel. The method is applied in particular for the coating of metal interconnections for solid oxide fuel cells (SOFC).