Corrosion resistance of porous ferritic stainless steel produced by liquid metal dealloying of Incoloy 800

Morgane Mokhtari (1) , Takeshi Wada (2) , Christophe Le Bourlot (1) , Jannick Duchet-Rumeau (3) , Hidemi Kato (2) , Éric Maire (1) , Nicolas Mary (1, 4)

1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
2 Tohoku University [Sendai]
3 IMP-LMM - Ingénierie des Matériaux Polymères - Laboratoire des Matériaux Macromoléculaires
4 ELyTMaX

Liquid metal dealloying is a newly available technology used to create bulk porous materials. In this study, a commercial nickel-based superalloy, Incoloy 800, was dealloyed to elaborate a fully porous ferritic stainless steel. The Mg selective dissolution in nitric acid solution acts as a passivation treatment that enhances the passive film resistance. Corrosion tests confirm the beneficial effect of the nitric acid treatment on the Cr enrichment of the passive film thus improved the material resistance. The electrochemical characterizations show a higher effect of the size porosities on the diffusion kinetics of the electrolyte rather than on the pitting sensitivity.

Mots clés: Dealloying; Nickel-based superalloy; Porous material; Corrosion resistance; Iron alloys

Domaines: Matériaux

Morgane Mokhtari, Takeshi Wada, Christophe Le Bourlot, Jannick Duchet-Rumeau, Hidemi Kato, et al.. Corrosion resistance of porous ferritic stainless steel produced by liquid metal dealloying of Incoloy 800. Corrosion Science, 2020, 166, pp.108468. ⟨10.1016/j.corsci.2020.108468⟩. ⟨hal-02497127⟩