Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Corrosion of Fe-(10~40)%Cr Steels in Na2SO4 Salts at 800~900℃

Fe-(10~40%)Cr강의 800~900℃에서의 Na2SO4 염에서의 부식

  • 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)
  • 김슬기 (성균관대학교 신소재공학부) ;
  • 이재호 (현대하이스코 기술연구소) ;
  • 이동복 (성균관대학교 신소재공학부)
  • Received : 2011.11.17
  • Published : 2012.05.25
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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

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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