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Duplex coatings techniques (DCT) onto Stainless steel AISI 310 were prepared by a double process consisting ofa n ion-nitriding treatment produced by Nitrogen/ Hydrogen plasma and a coating of ZrO2 -3 mole % Y2O3 growing by Chemical Solution Deposition. This paper invesFig.tigates the phenomena ofin terdiffusion betweenl elements and the formed phases. The zirconia coating process of nitrided steel initiated a strong diffusion process. Two intermediate layers formed: the outer mixing Fe and zirconia films elements and the inner ofhe matite. Unexpected results are obtained by a subsequent nitriding. When the order ofp rocessing steps is reversed, it produces a wholly limited interdiffusion ofelem ents. Nitrogen is incorporated into zirconia structure forming substitutional solid solution and avoids Nitrogen diffusion into the metallic substrate. Hydrogen, one component ofth e gas mixture, diffuses easily throughout the coating and it acts as reducing agent. The layer ofZ irconia are working like sieve, retaining Nitrogen and allowing the passage ofHy drogen.ZrO2 -3 mole % Y2O3 growing by Chemical Solution Deposition. This paper invesFig.tigates the phenomena ofin terdiffusion betweenl elements and the formed phases. The zirconia coating process of nitrided steel initiated a strong diffusion process. Two intermediate layers formed: the outer mixing Fe and zirconia films elements and the inner ofhe matite. Unexpected results are obtained by a subsequent nitriding. When the order ofp rocessing steps is reversed, it produces a wholly limited interdiffusion ofelem ents. Nitrogen is incorporated into zirconia structure forming substitutional solid solution and avoids Nitrogen diffusion into the metallic substrate. Hydrogen, one component ofth e gas mixture, diffuses easily throughout the coating and it acts as reducing agent. The layer ofZ irconia are working like sieve, retaining Nitrogen and allowing the passage ofHy drogen.