The Influence of Various Treating Parameters on the Corrosion of ZrO_2-Treated Type 304 Stainless Steels in High-Temperature Water

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概要

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• Corrosion mitigation techniques specifically developed for the vessel internals of boiling water reactors (BWRs) such as hydrogen water chemistry (HWC), catalytic coatings, and inhibitive coatings have been studied and/or adopted worldwide in the past decade. The common goal of these techniques is to mitigate intergranular stress corrosion cracking in the vessel internal components of BWRs. For enhancing the effectiveness of HWC through a more effective reduction in electrochemical corrosion potential accompanied by a lower hydrogen consumption rate or even without any added hydrogen, the technique of inhibitive treatment on structural component surfaces was brought into consideration. In the current study, surfaces of preoxidized square-disk specimens made of Type 304 stainless steel (SS) were treated with zirconium oxide (ZrO2) (particle sizes of 0.7 μm and 0.1 μm) via hydrothermal deposition at either 90 or 150°C for 7 or 14 d, while some preoxidized specimens remained untreated. The concentration of the treating solution was maintained at either 10 parts per million (ppm) or 122 ppm (1 mM) during the ZrO2 deposition processes. Electrochemical polarization analyses at 288°C were conducted to characterize the electrochemical properties of the treated and untreated SS specimens in pure water with either dissolved oxygen or dissolved hydrogen. It was found that a smaller particle size, a longer treating time, a lower treating temperature, as well as a higher treating solution concentration seemed to improve the corrosion resistance of the treated specimens in oxygenated environments and to moderately deter the hydrogen oxidation rate on the specimens.

• 一般社団法人 日本原子力学会の論文
• 2007-11-25

著者

• Wang Bai-yang

  Department Of Engineering And System Science National Tsing-hua University

• Yeh Tsung-kuang

  Nuclear Sci. And Technol. Dev. Center National Tsing-hua Univ.

• Tsai Chuen-horng

  Department Of Engineering And System Science National Tsing-hua University

• CHIEN Yuan-Chin

  Department of Engineering and System Science, National Tsing-Hua University

• Chien Yuan-chin

  Department Of Engineering And System Science National Tsing-hua University

関連論文

• The Influence of ZrO_2 Treatment on the Electrochemical Behavior of Oxygen and Hydrogen on Type 304 Stainless Steels in High Temperature Water
• Impact of Power Uprate on the Water Chemistry in the Primary Coolant Circuit of a Boiling Water Reactor Operating under a Fixed Core Flow Rate
• Experimental Characterization of an Inductively Coupled Plasma Discharge Using a Shape-Adjustable Coil
• The Influence of Various Treating Parameters on the Corrosion of ZrO_2-Treated Type 304 Stainless Steels in High-Temperature Water
• The Influence of Dissolved Hydrogen on the Corrosion of Type 304 Stainless Steels Treated with Inhibitive Chemicals in High Temperature Pure Water
• Intergranular Stress Corrosion Cracking of Type 304 Stainless Steels Treated with Inhibitive Chemicals in Simulated Boiling Water Reactor Environments
• Intergranular Stress Corrosion Cracking of Platinum Treated Type 304 Stainless Steels in High Temperature Water
• Electrochemical Corrosion Potential Modeling in the Primary Heat Transport Circuit of the Chinshan Boiling Water Reactor under the Condition of Hydrogen Water Chemistry with Noble Metal Coating
• The Efficiency of Noble Metals in Reducing the Corrosion Potential in the Primary Coolant Circuits of Boiling Water Reactors Operating under Hydrogen Water Chemistry Operation
• Characterization of Vacancy Defect Interaction on the Electric Properties of Zigzag Single-Walled Carbon Nanotubes

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