Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Hydrogen Concentration on Surface Oxidation Behavior of Alloy 600 in Simulated Primary Water of Pressurized Water Reactor

원전 1차측 수화학 환경에서 수소 농도가 Alloy 600의 표면산화 거동에 미치는 영향

  • Yun Soo, Lim (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Dong Jin, Kim (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Sung Woo, Kim (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Seong Sik, Hwang (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Hong Pyo, Kim (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Sung Hwan, Cho (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute)
  • 임연수 (한국원자력연구원 재료안전기술개발부) ;
  • 김동진 (한국원자력연구원 재료안전기술개발부) ;
  • 김성우 (한국원자력연구원 재료안전기술개발부) ;
  • 황성식 (한국원자력연구원 재료안전기술개발부) ;
  • 김홍표 (한국원자력연구원 재료안전기술개발부) ;
  • 조성환 (한국원자력연구원 재료안전기술개발부)
  • Received : 2022.10.19
  • Accepted : 2022.11.07
  • Published : 2022.12.30
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Abstract

Surface oxides and intergranular (IG) oxidation phenomena in Alloy 600 depending on hydrogen concentration were characterized to obtain clear insight into the primary water stress corrosion cracking (PWSCC) behavior upon exposure to pressurized water reactor primary water. When hydrogen concentration was between 5 and 30 cm3 H2/kg H2O, NiFe2O4 and NiO type oxides were found on the surface. NiO type oxides were found inside the oxidized grain boundary when hydrogen concentration was 5 cm3 H2/kg H2O. However, only NiFe2O4 spinel on the surface and Ni enrichment were observed when hydrogen concentration was 30 cm3 H2/kg H2O. These results indicate that the oxidation/reduction reaction of Ni in Alloy 600 depending on hydrogen concentration can considerably affect surface oxidation behavior. It appears that the formation of NiO type oxides in a Ni oxidation state and Ni enrichment in a Ni reduction (or metallic) state are common in primary water. It is believed that the above different oxidation/reduction reactions of Ni in Alloy 600 depending on hydrogen concentration can also significantly affect the resistance to PWSCC of Alloy 600.

Keywords

Acknowledgement

이 논문은 2019년도 산업통상자원부의 재원으로 한국에너지기술평가원의 지원(20191510301140, 해체원전 원자로 내부구조물 베플포머볼트 조사유기 응력부식 균열 열화 특성 분석 기술개발)을 받아 수행된 연구입니다.

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