Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
권호 표지

Localized Corrosion of Pure Zr and Zircaloy-4

  • Yu, Youngran (School of Advanced Materials Science and Engineering, Andong National University) ;
  • Chang, Hyunyoung (Power Engineering Research Institute, KOPEC) ;
  • Kim, Youngsik (School of Advanced Materials Science and Engineering, Andong National University)
  • Published : 2003.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Zirconium based alloys have been extensively used as a cladding material for fuel rods in nuclear reactors, due to their low thermal neutron absorption cross-section, excellent corrosion resistance and good mechanical properties at high temperatures. However, a cladding material for fuel rods in nuclear reactors was contact water during long time at high-temperature, so it is necessary to improve the wear and corrosion resistance of the fuel cladding, At ambient environment, there are few data or paper on the characteristic of corrosion in chloride solution and acidic solution. The specimens used in this work are pure Zr and Zircaloy-4. Zircaloy-4 is a specific zirconium-based alloy containing, on a weight percent basis, 1.4% Sn, 0.2% Fe, 0.1% Cr. Pitting corrosion resistance of two alloys by ASTM G48 is higher than that of electrochemical method. Passive film formed on Zircaloy-4 is mainly composed of $ZrO_2$, metallic Sn, and iron species regardless of formation environments. Also, passive film formed on Zr alloys shows n-type semiconductic property on the base of Mott-Schottky plot.

Keywords

References

  1. Y. H. Jeong, in Study on Phase Transformation Behavior and Nodular Corrosion Characteristics of Zircaloy-4 Alloy, Ph. D. Dissertation, The Graduate School, Yonsei University, (1991)
  2. H. G. Kim, M. H. Lee, S. Y. Park, Y. H. Jeong, and M. Y. Wey, The Korean lnstitute of Metals and Materials, 37, 11, 1399 (1999)
  3. S. J. Lee, H. S. Kwon, and J. S. Kim, Metals and Materials, 6, 2, 145 (2000)
  4. ASTM G 48, 'Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloy by the Use of Ferric Chloride Solution', Annual Book of ASTM Standards Vol. 03.02, Philadelphia, PA, USA, 1992
  5. N. E. Hakiki and M. Da Cunha Belo, J. Electrochemical Society, 143, 10, 3088 (1996)
  6. N. E. Hakiki, S. Boudin, B. Rondot, and M. Da Cunha Belo, Corrosion Science, 37. 11, 1809 (1995)
  7. Product Catalog, URANUS, 45N. A 22Cr 3Mo Duplex stainless Steel with PREN$\geq$33 or 34, Crensot-Liore Industrie, France
  8. Y. S. Kim and J. Kim, 'Synergistic effect of W and Mo addition on the pitting resistance of super ferritic stainless steels', 1998 Gordon Research Conference on Aqueous Corrosion, 1-23, Colby-Sawyer College, New London, NH, USA (1998)
  9. Y. S. Kim, Y. S. Park, B. Mitton and R. Latanision, Proceedings of the symposium on critical factors in localized corrosion III, R.G. Kelly, G.S. Frankel, P.M. Natishan, and R.C. Newman (eds.), p.89 (1998)
  10. Y. S. Kim, B. Mitton and R. Latanision, Proceeding of The Korean Electrochemical Society Spring Meeting, p.35 (1999)
  11. Y. S. Kim and H. Y. Jang, Proceeding of $196^t^h$ Meeting of The Electrochemical Society, Hawaii, p.513 (1999)