Effect of Nitrate on the Critical Potentials of Alloy 22 in Chloride Containing Environments

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The study of Alloy 22 has been undertaken in several selected nitrate/chloride (NO{sub 3}Cl{sup -}) electrolytes. These electrolytes include chloride concentrations [Cl{sup -}] of 1.0, 3.5 and 6.0 metal with NO{sub 3}/Cl{sup -} ratios of 0.05, 0.15 and 0.5 at various temperatures. Alloy 22 maintains is passivity in most industrial environments. As a result, it is highly desirable for numerous industrial applications including underground waste disposal systems. Alloy 22 possesses remarkably low general corrosion rates. It has exceptional resistance so localized corrosion including environmentally assisted cracking [1-7]. Alloy 22 (N06022) is a nickel(Ni)-alloy and contains 22% chromium (Cr), 13% molybdenum ... continued below

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Ilevbare, G.; King, K.; Gordon, S.; Gdowski, G.; Elayat, H. & Summers, T. May 13, 2004.

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The study of Alloy 22 has been undertaken in several selected nitrate/chloride (NO{sub 3}Cl{sup -}) electrolytes. These electrolytes include chloride concentrations [Cl{sup -}] of 1.0, 3.5 and 6.0 metal with NO{sub 3}/Cl{sup -} ratios of 0.05, 0.15 and 0.5 at various temperatures. Alloy 22 maintains is passivity in most industrial environments. As a result, it is highly desirable for numerous industrial applications including underground waste disposal systems. Alloy 22 possesses remarkably low general corrosion rates. It has exceptional resistance so localized corrosion including environmentally assisted cracking [1-7]. Alloy 22 (N06022) is a nickel(Ni)-alloy and contains 22% chromium (Cr), 13% molybdenum (Mo), 3% tungsten (W) and about 3% iron (Fe). The goal of this study was to determine the levels of NO{sub 3} required for effective inhibition of crevice corrosion at Alloy 22. To achieve this, carefully designed statistical cost matrices covering the selected range of CT compositions and temperatures were employed in carrying out the experiments. Specimens for three experiments were in the form of multiple crevice assemblies (MCA), optimized with 24 artificial crevice sites. Tests used in this investigation involved open circuit potential monitoring, polarization resistance, and cyclic polarization experiments. Potentiostatic polarization test were also employed.

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OSTI as DE00837506

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  • Report No.: NONE
  • Office of Scientific & Technical Information Report Number: 837506
  • Archival Resource Key: ark:/67531/metadc782819

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  • May 13, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Feb. 10, 2016, 7:28 p.m.

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Ilevbare, G.; King, K.; Gordon, S.; Gdowski, G.; Elayat, H. & Summers, T. Effect of Nitrate on the Critical Potentials of Alloy 22 in Chloride Containing Environments, article, May 13, 2004; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc782819/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.