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07414 Hydrothermal Deposition of Zirconia Coatings on Preoxidized BWR Structural Materials

Picture for 07414 Hydrothermal Deposition of Zirconia Coatings on Preoxidized BWR Structural Materials
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Product Number: 51300-07414-SG
ISBN: 07414 2007 CP
Author: Serguei Lvov, Zhuangfei Zhou, Elena Chalkova, and Peter Chou
Publication Date: 2007
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An in-situ hydrothermal deposition process was developed to apply a thin film of zirconia (ZrO2) 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 ZrO2 onto as received interior surface of 304 stainless steel and Alloy 600 tubing. 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 ZrO2 was found on stainless steel substrates whereas monoclinic/tetragonal mixed ZrO2 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.
An in-situ hydrothermal deposition process was developed to apply a thin film of zirconia (ZrO2) 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 ZrO2 onto as received interior surface of 304 stainless steel and Alloy 600 tubing. 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 ZrO2 was found on stainless steel substrates whereas monoclinic/tetragonal mixed ZrO2 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.
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