Fe-XAl-0.3Y 합금의 고온 황화환경(Ps 2 = 10 -3 Pa)에서의 부식거동

이병우; 박화순; Byung Woo Lee; Hwa Soon Park

Korean Journal of Materials Research, Vol.14, No.8, 547-551, August, 2004

DOI10.3740/MRSK.2004.14.8.547 Export Citation

Fe-XAl-0.3Y 합금의 고온 황화환경(Ps 2 = 10 -3 Pa)에서의 부식거동

Corrosion Behaviour of Fe-XAl-0.3Y Alloys at High Temperature Sulfidation Environment(Ps 2 = 10 -3 Pa)

이병우^†, 박화순

부경대학교 신소재공학부

Byung Woo Lee^†, and Hwa Soon Park

Division of Materials Sceince and Engineering, Pukyong National University, 608-739, Busan, Korea

E-mail:

e 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∼24 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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[2] Natesan K, Mater. High Temp., 14(2), 137 (1997)

[3] Lee BW, Park HI, Kim JS, Lee KH, Kim HS, Kor. J. Mat. Res., 7(10), 898 (1997)

[4] Fleischer RL, J. Mater. Sci., 22, 2281 (1987)

[5] Kim YW, Dimiduk DM, JOM, 43(8), 40 (1991)

[6] Li X, Baker I, Scr. Mater., 34(8), 1219 (1996)

[7] Taniguchi S, Shibata T, Oxid. Mat., 25, 201 (1986)

[8] Haanappel VAC, Glatz W, Clemens H, Stroosnijder MF, Mater. High Temp., 14(1), 19 (1997)

[9] Shankar Rao V, Baligidad RG, Raja VS, Intermetallics, 10, 73 (2002)

[10] Lee BW, Seo WC, Park C, Kor. J. Mat. Res., 13(12), 791 (2003)

[11] Patnaik PC, Smeltzer WW, Oxid. Met., 23(1), 53 (1985)

[12] Kai W, Hung RT, Oxid. Met., 48, 59 (1997)

[13] Kai W, Douglass DI, Oxid. Met., 39, 281 (1993)

[14] Yosioka T, Narita T, Zairyo-to-Kankyo, 48, 214 (1999)

[15] Lee BW, Kim WY, Corrosion Sci., 29(3), 177 (2000)