Effect of spinel and perovskite coatings on the long term oxidation of a ferritic stainless steel in H2/H2O atmosphere. (March 2019)

• Record Type: Journal Article
• Authors: Ardigo-Besnard, M.R.; Popa, I.; Chevalier, S.
• Is Part Of: Corrosion science. Volume 148(2019)
• Page Start: 251
• Page End: 263
• Publication Date: 2019-03
• Subjects: Stainless steel -- Oxidation -- High temperature corrosion -- Oxide coatings -- SEM -- X-ray diffraction; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.12.034
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The K41X alloy was surface-modified via the application of coatings. La0.8 Sr0.2 MnO3, LaNi0.6 Fe0.4 O3, Co2 MnO4 and Co3 O4 were chosen as coatings. Isothermal oxidation tests were performed up to 3000 h at 800 °C in H2 -H2 O. Fe-rich oxides growth was avoided and a protective (Cr, Mn)3 O4 /Cr2 O3 scale formed. All coatings were efficient in preventing from Cr evaporation up to 3000 h ageing. Abstract: In order to improve the oxidation behaviour of AISI441 ferritic stainless steel in H2 /H2 O atmosphere at 800 °C, four oxide coatings were tested: two perovskites (La0.8 Sr0.2 MnO3 and LaNi0.6 Fe0.4 O3 ) deposited by screen printing and two spinels (MnCo2 O4 and Co3 O4 ) obtained by PVD technique. Isothermal oxidation tests performed up to 3000 h showed that the coating presence avoided Fe oxides growth, which occurs for the raw alloy in the same conditions. Moreover, a protective (Cr, Mn)3 O4 /Cr2 O3 layer formed between the substrate and the coating. Any presence of Cr was not detected within the coatings, indicating that all compositions were efficient in preventing Cr evaporation.