Effect of Cu on oxidation behaviour of FCC Fe-Ni-Cr-Al and Ni-Cr-Al based alloys. (February 2020)

• Record Type: Journal Article
• Authors: Hayashi, Shigenari; Kudo, Daiki; Nagashima, Ryouta; Utsumi, Haruki
• Is Part Of: Corrosion science. Volume 163(2020)
• Publication Date: 2020-02
• Subjects: Al2O3-scale forming austenitic Fe-base alloy -- Cu effect -- Critical Al content for Al2O3 scale formation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108273
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Al2 O3 scale forming austenitic Fe-Ni-Cr-Al-Cu was proposed. Cu addition promotes exclusive Al2 O3 scale formation on Fe-based and Ni-based alloys. Cu addition decreases the oxygen concentration and enhances the outward Al diffusion. Abstract: The high-temperature oxidation behaviour of Fe-Ni-Cr-Al and Ni-Cr-Al alloys with and without Cu addition was investigated at 1000 °C in air to determine the effect of Cu on the critical Al content necessary for forming an external Al2 O3 scale. The oxidation mass gain of Fe-17Ni-17Cr-7.7Al-Cu and Ni-17Cr-10Al alloys was found to decrease with increased Cu content. An external Al2 O3 scale developed when 5at%Cu and more and 10at%Cu and more was added to Fe-17Ni-17Cr-7.7Al and Ni-17Cr-10Al alloys, respectively. The beneficial effect of Cu is inferred to be due to decreased oxygen concentration at the alloy surface and enhanced Al outward diffusion.