Corrosion Rate of Alloy 22 as a Function of Immersion Time

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Alloy 22 (N06022) is a nickel (Ni) based alloy containing nominally 22% Chromium (Cr), 13% Molybdenum (Mo) and 3% tungsten (W). Alloy 22 is highly resistant to general and localized corrosion such as pitting corrosion and stress corrosion cracking. Due to the formation of a stable passive film, when Alloy 22 is immersed in certain electrolytes, its corrosion potential (E{sub corr}) increases and its corrosion rate (CR) decreases as a function of the immersion time. This paper discusses the evolution of E{sub corr} and corrosion rate (CR) of creviced Alloy 22 specimens in six different mixtures of sodium chloride (NaCl) ... continued below

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4 p. (0.1 MB)

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Estill, J C; Hust, G A; King, K J & Rebak, R B March 21, 2005.

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Alloy 22 (N06022) is a nickel (Ni) based alloy containing nominally 22% Chromium (Cr), 13% Molybdenum (Mo) and 3% tungsten (W). Alloy 22 is highly resistant to general and localized corrosion such as pitting corrosion and stress corrosion cracking. Due to the formation of a stable passive film, when Alloy 22 is immersed in certain electrolytes, its corrosion potential (E{sub corr}) increases and its corrosion rate (CR) decreases as a function of the immersion time. This paper discusses the evolution of E{sub corr} and corrosion rate (CR) of creviced Alloy 22 specimens in six different mixtures of sodium chloride (NaCl) and potassium nitrate (KNO{sub 3}) at 100 C. Two types of specimens were used, polished as-welded (ASW) and as-welded solution plus heat-treated (ASW+SHT). The latter contained the black annealing oxide film on the surface. Results show that, for the two type of materials, as the immersion time increases, E{sub corr} increased and the CR decreased. Even for concentrated brine solutions at 100 C the CR was < 50 nm/year after more than 100 days immersion.

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4 p. (0.1 MB)

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PDF-file: 4 pages; size: 0.1 Mbytes

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  • Journal Name: TMS Letters; Journal Volume: 2; Journal Issue: 1

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  • Report No.: UCRL-JRNL-210726
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 877831
  • Archival Resource Key: ark:/67531/metadc876058

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 21, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • April 13, 2017, 6:04 p.m.

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Estill, J C; Hust, G A; King, K J & Rebak, R B. Corrosion Rate of Alloy 22 as a Function of Immersion Time, article, March 21, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc876058/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.