Intergranular Stress Corrosion Cracking of Type 304 Stainless Steels Treated with Inhibitive Chemicals in Simulated Boiling Water Reactor Environments

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概要

• 論文の詳細を見る

• Electrochemical potentiodynamic polarizations, electrochemical corrosion potential (ECP) measurements and slow strain rate tensile (SSRT) tests were conducted to investigate the intergranular stress corrosion cracking (IGSCC) characteristics of Type 304 stainless steels treated with inhibitive chemicals in simulated boiling water reactor (BWR) environments. A number of thermally sensitized specimens were prepared and were pre-oxidized in a 288°C environment with the presence of 300 ppb dissolved oxygen for 360 h. Most of the specimens were then treated with various chemicals including powdered zirconium oxide (ZrO2), powdered titanium oxide (TiO2), and zirconyl nitrate [ZrO(NO3)2] via static immersion at 90°C, 150°C, and 200°C. Test environments were specifically designed in a circulation loop to create a dissolved oxygen concentration of 300 ppb. Test results showed that the corrosion current densities of all treated specimens were lower than that of the untreated, pre-oxidized specimen at ambient temperature in a solution mixed with 1 mM K3Fe(CN)6 and 1 mM K4Fe(CN)6. The ECPs of the treated specimens could be lower or higher than that of the pre-oxidized one at 288°C, depending upon the type of treating chemical and the treating temperature. In addition, IGSCC was observed on all specimens (treated or untreated) in the same environment. However, the untreated specimen exhibited lower elongation, shorter failure time, and more secondary cracks on the side surfaces. It was therefore suggested that inhibitive chemicals such as ZrO2, TiO2, and ZrO(NO3)2 did provide a certain degree of enhancement in improving the mechanical behavior of the treated specimens and in prolonging the IGSCC initiation time.

• 一般社団法人 日本原子力学会の論文
• 2002-05-25

著者

• Yeh Tsung-kuang

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

• Yeh Tsung-kuang

  Nuclear Science And Technology Development Center National Tsing-hua University

• Tsai Chuen-horng

  Department Of Engineering And System Science National Tsing-hua University

• LEE Ming-Yong

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

• Lee Ming-yong

  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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