Influence of Al content and pre-oxidation on the aqueous corrosion resistance of binary Fe-Al alloys in sulphuric acid. (1st April 2019)

• Record Type: Journal Article
• Authors: Peng, Jian; Moszner, Frank; Rechmann, Julian; Vogel, Dirk; Palm, Martin; Rohwerder, Michael
• Is Part Of: Corrosion science. Volume 149(2019)
• Page Start: 123
• Page End: 132
• Publication Date: 2019-04-01
• Subjects: Fe-Al alloys -- Aqueous corrosion resistance -- Pre-oxidation -- Sulphuric acid; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.12.040
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The effect of Al content on the corrosion resistance of Fe-Al alloys was revealed. Passive film structure on Fe-25Al was evaluated by XPS. The oxide layer effectively protected Fe-25Al against corrosion in H2 SO4 . Abstract: The influence of Al content and pre-oxidation on the corrosion behavior of binary Fe-Al alloys in 0.0126 M H2 SO4 was investigated. The minimum Al content for forming a passive film on binary Fe-Al at 25 °C is 15 at.% and passivation improves up to 25 at.% Al. X-ray photoelectron spectroscopy measurements show that the passive film on Fe-25Al is enriched in Al and consists of an outer layer of mixed Al and Fe hydroxides and an inner layer of Al oxide. The oxide layer generated at 1000 °C effectively protected against aqueous corrosion in H2 SO4 .