Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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High Temperature Corrosion of Alloy 617 in Impure Helium and Air for Very High-Temperature Gas Reactor

초고온가스로용 Alloy 617의 불순물 함유 헬륨/공기 중에서 고온부식 특성

  • Jung, Sujin (Nuclear Materials Division, Korea Atomic Energy Research Institute) ;
  • Lee, Gyeong-Geun (Nuclear Materials Division, Korea Atomic Energy Research Institute) ;
  • Kim, Dong-Jin (Nuclear Materials Division, Korea Atomic Energy Research Institute) ;
  • Kim, Dae-Jong (Nuclear Materials Division, Korea Atomic Energy Research Institute)
  • 정수진 (한국원자력연구원 원자력재료개발부) ;
  • 이경근 (한국원자력연구원 원자력재료개발부) ;
  • 김동진 (한국원자력연구원 원자력재료개발부) ;
  • 김대종 (한국원자력연구원 원자력재료개발부)
  • Received : 2012.02.20
  • Accepted : 2013.04.25
  • Published : 2013.04.15
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Abstract

A very high-temperature gas reactor (VHTR) is one of the next generation nuclear reactors owing to its safety, high energy efficiency, and proliferation-resistance. Heat is transferred from the primary helium loop to the secondary helium loop through an intermediate heat exchanger (IHX). Under VHTR environment Alloy 617 is being considered a candidate Ni-based superalloy for the IHX of a VHTR, owing to its good creep resistance, phase stability and corrosion resistance at high temperature. In this study, high-temperature corrosion tests were carried out at 850 - $950^{\circ}C$ in air and impure helium environments. Alloy 617 specimens showed a parabolic oxidation behavior for all temperatures and environments. The activation energy for oxidation was 154 kJ/mol in helium environment, and 261 kJ/mol in an air environment. The scanning electron microscope (SEM) and energy-dispersive x-ray spectroscopy (EDS) results revealed that there were a Cr-rich surface oxide layer, Al-rich internal oxides and depletion of grain boundary carbide after corrosion test. The thickness and depths of degraded layers also showed a parabolic relationship with the time. A corrosion rate of $950^{\circ}C$ in impure helium was higher than that in an air environment, caused by difference in the outer oxide morphology.

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