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Author: search.filters.author.Chandra-ambhorn, SomrerkSubject: search.filters.subject.electrodeposition

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    Item type:Publication,
    Fabrication of Mn–Co Alloys Electrodeposited on AISI 430 Ferritic Stainless Steel for SOFC Interconnect Applications
    (2023-03-01)
    Thanedburapasup, Saravut
    ;
    Wetchirarat, Nattapol
    ;
    Muengjai, Angkana
    ;
    Tengprasert, Watcharapon
    ;
    Wiman, Panya
    Mn–Co alloys were electroplated on AISI 430 stainless steel using an electrodeposition technique with the aim to reduce oxidation and chromium volatilization. The electroplating parameters were designed to improve the coating quality. The increased current density with decreased MnSO<inf>4</inf> content resulted in a denser coating layer. A sample coated with 0.10 M CoSO<inf>4</inf> and 0.50 MnSO<inf>4</inf> at 350 mA cm<sup>−2</sup> showed the best oxidation resistance after being oxidized at 800 °C for 90 h. The X-ray diffraction (XRD) result revealed that the oxide growth on the surface of the coated samples mainly formed oxides of MnCo<inf>2</inf>O<inf>4</inf>, MnCr<inf>2</inf>O<inf>4</inf>, and Cr<inf>2</inf>O<inf>3</inf>. The chromium volatilization was evaluated by exposing the coated samples to humidified synthetic air at 800 °C for 96 h. The mass flux of Cr volatilization was on the order of 10<sup>−11</sup> g cm<sup>−2</sup> s<sup>−1</sup>. Furthermore, different heat treatments in O<inf>2</inf> and CO<inf>2</inf> atmospheres were compared. Annealing in CO<inf>2</inf> at 800 °C for 4 h helped increase the Mn–Co coating density. The relationship between the porosity and its failure behavior was also discussed.