Hydrothermal deposition of zirconia coatings on pre-oxidized BWR structural materials

Z. F. Zhou, E. Chalkova, S. N. Lvov, P. Chou

Research output: Contribution to journalConference article

Abstract

An in-situ hydrothermal deposition process was developed to apply a thin film of zirconia (ZrO 2) onto structural materials used in Boiling Water Reactors (BWRs) as a potential method for mitigating intergranular stress corrosion cracking (IGSCC). The coating process has been demonstrated to successfully deposit ZrO 2 onto as received interior surface of 304 stainless steel and Alloy 600 tubing.1 This work reports on the application of this coating process to substrates with different surface conditions including the condition that exists on the surface of the structural material in BWRs. The coatings on as-received and pre-oxidized surfaces showed excellent adhesion while those on the polished are usually worse. Tetragonal dominant ZrO 2 was found on stainless steel substrates whereas monoclinic/tetragonal mixed ZrO 2 was observed on Alloy 600 substrates. The coating on pre-oxidized stainless steel did not reveal a reduced electrochemical potential (ECP) similarly to that was found in our previous study.

Original languageEnglish (US)
Pages (from-to)74141-741413
Number of pages667273
JournalNACE - International Corrosion Conference Series
StatePublished - Dec 1 2007
EventCorrosion 2007 - Nashville, TN, United States
Duration: Mar 11 2007Mar 15 2007

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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