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http://dx.doi.org/10.3740/MRSK.2004.14.8.547

Corrosion Behaviour of Fe-XAl-0.3Y Alloys at High Temperature Sulfidation Environment(Ps2=10-3Pa)  

Lee Byung Woo (Division of Materials Science and Engineering, Pukyong National Univ.)
Park Hwa Soon (Division of Materials Science and Engineering, Pukyong National Univ.)
Publication Information
Korean Journal of Materials Research / v.14, no.8, 2004 , pp. 547-551 More about this Journal
Abstract
The sulfidation behaviour of Fe-XAl-0.3Y(X=5, 10, 14, 25 $wt.\%$) alloys was investigated at 1123 K in $H_2/H_{2}S$ gas atmosphere for $1\sim24$ hrs using SEM/EDX, XRD and EPMA. The weight changes of Fe-XAl-0.3Y alloys followed the parabolic rate law, Sulfidation rates of iron aluminide alloys with high Al content were one-twentieth lower than that of 5Al alloys. This is due to the formation of protective $Al_{2}O_3$ oxides on the surface of 10Al, 14Al and 25Al alloys. By calculating partial pressure of impurity oxygen contained $H_2/H_{2}S$ gas, the $Al_{2}O_3$ oxides formation could be explained using Fe-Al-S-O thermodynamic stability diagram. The sulfidation product scales of the 5Al alloy showed that thick iron sulfide scale(FeS) containing porosities formed during early stages of sulfidation. With continued sulfidation, aluminum sulfide was formed at the alloy/scale interface.
Keywords
sulfidation behaviour; sulfidation rates; Fe-Al-S-O thermodynamic stability diagra;
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Times Cited By KSCI : 2  (Citation Analysis)
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