Intergranular Stress Corrosion Cracking of Platinum Treated Type 304 Stainless Steels in High Temperature Water

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概要

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• Electrochemical polarization analyses, slow strain rate tensile (SSRT) tests and crack growth tests were conducted to investigate the intergranular stress corrosion cracking (IGSCC) characteristics of platinum treated Type 304 stainless steels in 288°C pure water. All specimens were thermally sensitized and pre-oxidized before the tests, and some of them were additionally treated with platinum via hydrothermal deposition. Test environments were specifically designed in a circulation loop to create water chemistry conditions of hydrogen to oxygen molar ratios (MH/O) of 0, 0.5, and 2.7 in the coolant. Test results showed that the corrosion current densities of the specimens treated with platinum were higher than those of the pre-oxidized ones under oxygenated conditions, but the corrosion potentials of the treated specimens could be either lower or higher than those of the untreated ones. In addition, IGSCC was not observed on all specimens (treated or untreated) when the MH/O in the test coolant was 0.5 or 2.7. However, the platinum treated specimens actually showed severer IGSCC after the SSRT tests conducted under the coolant condition of MH/O=0. Crack growth test results indicate a similar but worse trend to that in the SSRT tests. It was therefore suggested that one must exercise extra caution to use corrosion potential as a sole indicator in evaluating the influence of noble metal treatment on the IGSCC susceptibility of Type 304 stainless steels, especially when the MH/O in the coolant is relatively low or the dissolved oxygen concentration remains comparatively high.

• 一般社団法人 日本原子力学会の論文
• 2004-02-25

著者

• 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

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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