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Corrosion of Fe-(9~37) wt. %Cr Alloys at 700–800 °C in (N2, H2O, H2S)-Mixed Gas

School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea
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Academic Editor: Robert Tuttle
Metals 2016, 6(11), 291; https://doi.org/10.3390/met6110291
Received: 18 October 2016 / Revised: 14 November 2016 / Accepted: 15 November 2016 / Published: 23 November 2016
(This article belongs to the Special Issue Alloy Steels)
Fe-(9, 19, 28, 37) wt. %Cr alloys were corroded at 700 and 800 °C for 70 h under 1 atm of N2, 1 atm of N2/3.2%H2O mixed gas, and 1 atm of N2/3.1%H2O/2.42%H2S mixed gas. In this gas composition order, the corrosion rate of Fe-9Cr alloy rapidly increased. Fe-9Cr alloy was always non-protective. In contrast, Fe-(19, 28, 37) wt. %Cr alloys were protective in N2 and N2/3.2%H2O mixed gas because of the formation of the Cr2O3 layer. They, however, became nonprotective in N2/3.1%H2O/2.42%H2S mixed gas because sulfidation dominated to form the outer FeS layer and the inner Cr2S3 layer containing some FeCr2S4. View Full-Text
Keywords: Fe-Cr alloy; oxidation; sulfidation; H2S corrosion Fe-Cr alloy; oxidation; sulfidation; H2S corrosion
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Kim, M.J.; Abro, M.A.; Lee, D.B. Corrosion of Fe-(9~37) wt. %Cr Alloys at 700–800 °C in (N2, H2O, H2S)-Mixed Gas. Metals 2016, 6, 291.

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