고온 이산화황 환경 내 내열 크롬강에 대한 부식특성 연구 (High Temperature Corrosion Properties of Heat Resistant Chrome Steels in SO2 Atmosphere)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 47권 / 2호 / 99 ~ 106페이지
· 저자명 : 이한상, 정진성, 김의현

초록

The high temperature corrosion properties of heat resistant steels were investigated in oxidation
atmosphere including sulfur dioxide. The heat resistant steels of T22, T92, T122, T347HFG and T304H were
evaluated at 620, 670˚C for 400 hours. The corrosion rates showed a decreasing tendency while chrome contents
of those steels increased from 2 mass.% to 19 mass.%. The in crease in temperature increasement has an more
effect on the corrosion rates of low chrome steels than high chrome steels. The weight gains of T22, T92, T304H
at 670˚C were 3.7, 1.65, 1.23 times compared with those at 620˚C. The external scale formed on T22 was
composed of hematite, magnetite and Fe-Cr spinel and internal layer including iron oxide mixed with sulfide.
The scales formed on T92, T122, T304H consisted of an outer layer of hematite and inner layer of chrome oxide
and hematite. The proportion of chrome oxide at inner layer was increased when the chrome contents in heat
resistant steels were increased.

영어초록

The high temperature corrosion properties of heat resistant steels were investigated in oxidation
atmosphere including sulfur dioxide. The heat resistant steels of T22, T92, T122, T347HFG and T304H were
evaluated at 620, 670˚C for 400 hours. The corrosion rates showed a decreasing tendency while chrome contents
of those steels increased from 2 mass.% to 19 mass.%. The in crease in temperature increasement has an more
effect on the corrosion rates of low chrome steels than high chrome steels. The weight gains of T22, T92, T304H
at 670˚C were 3.7, 1.65, 1.23 times compared with those at 620˚C. The external scale formed on T22 was
composed of hematite, magnetite and Fe-Cr spinel and internal layer including iron oxide mixed with sulfide.
The scales formed on T92, T122, T304H consisted of an outer layer of hematite and inner layer of chrome oxide
and hematite. The proportion of chrome oxide at inner layer was increased when the chrome contents in heat
resistant steels were increased.

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