Zirconium oxide coatings on P91 and zircaloy (Zr-2.5%Nb) substrates for use in SCWRs

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TypeArticle
Proceedings titleCanadian Nuclear Society - 32nd Annual Conference of the Canadian Nuclear Society and 35th CNS/Can Student Conference 2011
Conference32nd Annual Conference of the Canadian Nuclear Society and 35th CNS/Can Student Conference 2011, 5 June 2011 through 8 June 2011, Niagara Falls, ON
ISBN9781618394149
Volume2
Pages917925; # of pages: 9
SubjectAdhering layers; CANDU-SCWR; Coating adhesion; Corrosion-resistant coating; Dissolution process; Exposure time; Innovative method; Materials of constructions; Operating condition; P91; Plasma spray deposition; Reactor materials; Supercritical water; Weight gain; Zircaloy; Zirconium oxide coatings; Adhesion; Coatings; Corrosion; Degradation; Materials; Niobium oxide; Plasma spraying; Protective coatings; Water cooled reactors; Zirconia; Zirconium alloys; Zirconium
AbstractThe CANDU-SCWR presents difficult operating conditions for materials of construction and innovative methods, such as corrosion-resistant coatings, are being developed for reactor materials. In this study, Zircaloy (Zr-2.5%Nb) and P91 were coated with tightly adhering layers of zirconium-based oxides (ZrO 2 or Zr-NbO 2) through a plasma spray deposition (PSD) process. The coupons were exposed to deoxygenated supercritical water at 500°C and 25 MPa for increasing durations, up to 900 hours. Coated coupons showed a reduced weight gain at all exposure times when compared to uncoated samples however SEM work reveals that poor coating adhesion resulted in degradation of the coating through oxide loss by spallation or dissolution processes.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Fuel Cell Innovation (IFCI-IIPC)
Peer reviewedYes
NPARC number21271234
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Record identifierc567f7e2-edb6-41b7-9996-dded65fc7d66
Record created2014-03-24
Record modified2016-05-09
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