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Corrosion Behavior of Fe-Cr Alloys in Ar-10%O2 Atmosphere

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Abstract:

The corrosion of four Fe-Cr alloys (Cr: 9, 12, 20, and 25%) with different Cr contents were subjected to cyclic oxidation furnace in Ar-10%O2 atmosphere at 950oC for 120 h. The samples after oxidation were investigated by using X-ray diffraction (XRD), optical metallography and SEM/EDS. The results indicated that increasing Cr content reduced the oxidation rate and the scale cracking. Alloys with less Cr content occurred breakaway oxidation due to formation of Fe-rich oxide scale. However, a thin protective chromia scale was observed on alloys with Cr > 20%. The corrosion behaviour on Fe-Cr alloy was then discussed based on experimental observation.

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Periodical:

Key Engineering Materials (Volumes 462-463)

Pages:

1250-1254

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.462-463.1250

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Online since:

January 2011

Authors:

Norinsan Kamil Othman, N. Othman, Azman Jalar

Keywords:

Breakaway Oxidation, Chromia, Fe-Cr Alloy, Scale Cracking

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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