Modification of the La0.6Sr0.4CoO3 coating deposited on ferritic stainless steel by spray pyrolysis after oxidation in air at high temperature

The behaviour of La0.6Sr0.4CoO3 applied to ferritic stainless steel (AISI 430) by spray pyrolysis was investigated after oxidation at 800 °C in air. The film was characterized with regard to its morphology, structure and adhesion. The film was regular over the entire surface and adhered well to the metallic substrate. Oxidation modified the film structure, forming an oxide (SrCrO4) in the metal/coating region due to Sr diffusion from the coating and Cr diffusion from the metallic substrate. A thermodynamic computational simulation confirmed the formation and stability of this oxide.

► Perovskite coating was produced by spray pyrolysis on ferritic stainless steel.
► The La0.6Sr0.4CoO3 coating increases the substrate oxidation resistance.
► The structural study indicated the modification coating after isothermal oxidation.
► After oxidation the film presented modification in its structure, forming SrCrO4.
► The thermodynamic study confirmed the coating modification.