The Effect of pH on Nickel Alloy SCC and Corrosion Performance

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Alloy X-750 condition HTH stress corrosion crack growth rate (SCCGR) tests have been conducted at 360 C (680 F) with 50 cc/kg hydrogen as a function of coolant pH. Results indicate no appreciable influence of pH on crack growth in the pH (at 360 C) range of {approx} 6.2 to 8.7, consistent with previous alloy 600 findings. These intermediate pH results suggest that pH is not a key variable which must be accounted for when modeling pressurized water reactor (PWR) primary water SCC. In this study, however, a nearly three fold reduction in X-750 crack growth rate was observed in ... continued below

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4656 Kilobytes pages

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Morton, D.S. & Hansen, M. October 10, 2002.

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  • Lockheed Martin
    Publisher Info: Lockheed Martin Corporation, Schenectady, NY 12301 (United States)
    Place of Publication: Schenectady, New York

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Description

Alloy X-750 condition HTH stress corrosion crack growth rate (SCCGR) tests have been conducted at 360 C (680 F) with 50 cc/kg hydrogen as a function of coolant pH. Results indicate no appreciable influence of pH on crack growth in the pH (at 360 C) range of {approx} 6.2 to 8.7, consistent with previous alloy 600 findings. These intermediate pH results suggest that pH is not a key variable which must be accounted for when modeling pressurized water reactor (PWR) primary water SCC. In this study, however, a nearly three fold reduction in X-750 crack growth rate was observed in reduced pH environments (pH 3.8 through HCl addition and pH 4-5.3 through H{sub 2}SO{sub 4} addition). Crack growth rates did not directly correlate with corrosion film thickness. In fact, 10x thicker corrosion films were observed in the reduced pH environments.

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4656 Kilobytes pages

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INIS; OSTI as DE00821960

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  • Other Information: PBD: 10 Oct 2002

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  • Report No.: LM-02K093
  • Grant Number: AC12-00SN39357
  • DOI: 10.2172/821960 | External Link
  • Office of Scientific & Technical Information Report Number: 821960
  • Archival Resource Key: ark:/67531/metadc782319

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  • October 10, 2002

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 28, 2016, 8:43 p.m.

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Morton, D.S. & Hansen, M. The Effect of pH on Nickel Alloy SCC and Corrosion Performance, report, October 10, 2002; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc782319/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.