Effect of Al and Cr contents on the High Temperature Oxidation- and Sulfidation-resistance of Fe Alloys
Fe합금의 내 산화성과 황화성에 미치는 Al과 Cr 함량의 영향
김슬기;이동복;
Kim, Seul-Ki;Lee, Dong-Bok;
성균관대학교 신소재공학과;
School of Advanced Materials Science & Engineering, Sungkyunkwan University;
DOI : 10.5695/JKISE.2012.45.2.061
Alloys of Fe-(5, 10, 15)Al and Fe-(10, 20, 30, 40)Cr were corroded at 700 and $800^{circ}C$ for 70 hr in either atmospheric air or 1 atm of Ar+$1%SO_2$ gases. In these atmospheres, Fe-5Al and Fe-10Cr alloys displayed poor corrosion resistance. In atmospheric air, Fe-5Al alloys formed oxide nodules, while Fe-10Cr alloys formed thick scales and internal oxides. In Ar+$1%SO_2$ gases, Fe-5Al and Fe-10Cr alloys formed thick, nonadherent bi-layered scales, which grew primarily by the outward diffusion of Fe ions and inward diffusion of oxygen and sulfur ions. By contrast, in atmospheric air and Ar+$1%SO_2$ gases, Fe-(10, 15)Al and Fe-(20, 30, 40)Cr alloys displayed good corrosion resistance by forming $Al_2O_3$ and $Cr_2O_3$ layers on the surface, respectively.
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