Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Water Chemistry Factors on Flow Accelerated Corrosion : pH, DO, Hydrazine

유동가속부식에 영향을 미치는 수화학 인자 : pH, 용존산소, 하이드라진

  • Lee, Eun Hee (Nuclear Materials Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Kyung Mo (Nuclear Materials Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Hong Pyo (Nuclear Materials Development Division, Korea Atomic Energy Research Institute)
  • 이은희 (한국원자력연구원 원자력재료개발부) ;
  • 김경모 (한국원자력연구원 원자력재료개발부) ;
  • 김홍표 (한국원자력연구원 원자력재료개발부)
  • Received : 2013.11.06
  • Accepted : 2013.12.27
  • Published : 2013.12.31
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Abstract

Flow accelerated corrosion(FAC) of the carbon steel piping in pressurized water reactors(PWRs) has been major issue in nuclear industry. Severe accident at Surry Unit 2 in 1986 initiated the worldwide interest in this area. Major parameters influencing FAC are material composition, microstructure, water chemistry, and hydrodynamics. Qualitative behaviors of FAC have been well understood but quantitative data about FAC have not been published for proprietary reason. In order to minimize the FAC in PWRs, the optimal method is to control water chemistry factors. Chemistry factors influencing FAC such as pH, corrosion potential, and hydrazine contents were reviewed in this paper. FAC rate decreased with pH up to 10 because magnetite solubility decreased with pH. Corrosion potential is generally controlled dissolved oxygen (DO) and hydrazine in secondary water. DO increased corrosion potential. FAC rate decreased with DO by stabilizing magnetite at low DO concentration or by formation of hematite at high DO concentration. Even though hydrazine is generally used to remove DO, hydrazine itself thermally decomposed to ammonia, nitrogen, and hydrogen raising pH. Hydrazine could react with iron and increased FAC rate. Effect of hydrazine on FAC is rather complex and should be careful in FAC analysis. FAC could be managed by adequate combination of pH, corrosion potential, and hydrazine.

Keywords

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