Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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The use of Thermodynamics and Phase Equilibria for Prediction of the Behavior of High Temperature Corrosion of Alloy 617 in Impure Helium Environment

  • Kim, Dong-Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute(KAERI)) ;
  • Lee, Gyeong-Geun (Nuclear Materials Research Division, Korea Atomic Energy Research Institute(KAERI)) ;
  • Kim, Sung-Woo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute(KAERI)) ;
  • Kim, Hong-Pyo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute(KAERI))
  • Received : 2010.05.26
  • Accepted : 2010.07.23
  • Published : 2010.08.01
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Abstract

Thermodynamic consideration was performed for Alloy 617 exposed to an impure helium ($H_2$ 20pa, $H_2O$ 0.5pa, $CH_4$ 2pa and CO 5pa) at $950^{\circ}C$. Oxidation power was decreased in the order Al > Ti > Si > Cr > Mn. Decarburization and carburization reactions were available leading to carbon activity decrease and increase, respectively, depending on carbon and Cr activities. The thermodynamic prediction was compared with the experimental results obtained in similar conditions (($H_2$ 20pa, $H_2O$ 0.05pa, $CH_4$ 5pa and CO 2pa) and $950^{\circ}C$) by others for Alloy 617. The driving force for oxidation of Al, Ti and Si is very large to be oxidized at a given impure helium and the environment is actually carburizing towards the structural alloy, which is consistent with this work.

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References

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