Oxidative corrosion resistance of a CrₓFeᵧNi₁₋ₓ₋ᵧ composition spread alloy film (CSAF) in dry air - Université de Pau et des Pays de l'Adour Accéder directement au contenu
Article Dans Une Revue Applied Surface Science Année : 2024

Oxidative corrosion resistance of a CrₓFeᵧNi₁₋ₓ₋ᵧ composition spread alloy film (CSAF) in dry air

Résumé

Composition Spread Alloy Films (CSAFs) were used to study the resistance to oxidative corrosion of CrxFeyNi1-x-y alloys in dry air and determine the critical Cr composition, xCr∗, necessary to prevent bulk oxidation. CrxFeyNi1-x-y CSAFs were made using physical vapor deposition (PVD) and then oxidized in dry air between 100 – 500 °C for periods of 1 h. A sharp passivation boundary was observed at 300 °C separating alloys showing evidence of heavy oxidation from Cr-rich alloys that were passivated. X-ray photoelectron spectroscopy (XPS) depth profiling was used to measure the extent of oxidation and penetration depth of the oxide layer on either side of the passivation boundary. XPS measurements confirmed the presence of a critical Cr composition, xCr∗, ranging from 18 to 26 at.%. For alloys with xCr≥xCr∗, a sufficiently thick passivating layer of oxidized Cr, Cr(ox), had formed on the top surface preventing the oxidative corrosion of either Fe or Ni. On the other hand, when , bulk oxidation was observed, with appreciable Fe(ox) and/or Ni(ox) measured on the surface and often penetrating through the entire alloy film thickness. The trajectory of plotted within CrxFeyNi1-x-y composition space supports the trend towards using higher Cr-content stainless steel grades in harsh oxidative environments.
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hal-04613754 , version 1 (17-06-2024)

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Camille Ferris, Nicholas Golio, Hervé Martinez, Andrew J Gellman. Oxidative corrosion resistance of a CrₓFeᵧNi₁₋ₓ₋ᵧ composition spread alloy film (CSAF) in dry air. Applied Surface Science, 2024, 669, pp.160391. ⟨10.1016/j.apsusc.2024.160391⟩. ⟨hal-04613754⟩
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