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http://dx.doi.org/10.3365/KJMM.2012.50.5.361

Corrosion of Fe-(10~40)%Cr Steels in Na2SO4 Salts at 800~900℃  

Kim, Seul Ki (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
Lee, Jae Ho (Hyundai Hysco)
Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
Publication Information
Korean Journal of Metals and Materials / v.50, no.5, 2012 , pp. 361-368 More about this Journal
Abstract
Fe-(10, 20, 30, 40) wt%Cr alloys were corroded in $Na_2SO_4$ salts ($m.p.=884^{\circ}C$) at $800{\sim}900^{\circ}C$ for 3-300 hrs. Their corrosion resistance increased with an increase in Cr content owing to the formation of slowly growing $Cr_2O_3$. During corrosion, $Na_2SO_4$ dissociated and reacted with the alloys to form $Cr_2O_3$ and $Fe_2O_3$. Since $Fe_2O_3$ dissolved fast into the salts, most of the scales consisted primarily of $Cr_2O_3$. Inside the scale, a small amount of sulfides also existed. The oxidation, dissolution and detachment of the formed scales occurred significantly.
Keywords
metals; casting; oxidation; scanning electron microscopy (SEM); hot corrosion;
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Times Cited By KSCI : 1  (Citation Analysis)
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