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    National Tsing Hua University Institutional Repository > 原子科學院  > 工程與系統科學系 > 期刊論文 >  Intergranular Stress Corrosion Cracking of Type 304 Stainless Steels Treated with Inhibitive Chemicals in Simulated Boiling Water Reactor Environments

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/48330

    Title: Intergranular Stress Corrosion Cracking of Type 304 Stainless Steels Treated with Inhibitive Chemicals in Simulated Boiling Water Reactor Environments
    Authors: T.K. Yeh;M.Y. Lee;C.H. Tsai
    教師: 蔡春鴻
    Date: 2002
    Publisher: Atomic Energy Society of Japan
    Relation: Journal of Nuclear Science and Technology, v 39, n 5, p 531-539, May 2002
    Keywords: stainless steel 304
    hydrothermal deposition
    titanium oxides
    zirconium oxides
    inhibitive coating
    exchange current density
    Abstract: 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 288degreesC 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 90degreesC, 150degreesC, and 200degreesC. 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 hi.-her than that of the pre-oxidized one at 288degreesC, 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.
    URI: http://sciencelinks.jp/j-east/article/200214/000020021402A0485930.php
    Appears in Collections:[工程與系統科學系] 期刊論文

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