Environmental and Geometrical Conditions to Sustain Crevice Corrosion in Alloy 22

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Alloy 22 (N06022) is highly resistant to localized corrosion. Under aggressive environmental conditions Alloy 22 may be susceptible to crevice corrosion in hot chloride (Cl{sup -}) solutions. The objective of the present work was to explore the environmental and geometrical conditions for crevice corrosion to occur. Electrochemical tests were performed using PCA and prismatic mill annealed Alloy 22 specimens in chloride solutions. Crevice corrosion current density was found to be a function of applied potential. i{sub CREV} values ranged from 40 {micro}A/cm{sup 2} to 20 mA/cm{sup 2}. Such low values of current density explained the absence of pitting corrosion in ... continued below

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Carranza, R M; Rodr?guez, M A & Rebak, R B November 10, 2006.

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Alloy 22 (N06022) is highly resistant to localized corrosion. Under aggressive environmental conditions Alloy 22 may be susceptible to crevice corrosion in hot chloride (Cl{sup -}) solutions. The objective of the present work was to explore the environmental and geometrical conditions for crevice corrosion to occur. Electrochemical tests were performed using PCA and prismatic mill annealed Alloy 22 specimens in chloride solutions. Crevice corrosion current density was found to be a function of applied potential. i{sub CREV} values ranged from 40 {micro}A/cm{sup 2} to 20 mA/cm{sup 2}. Such low values of current density explained the absence of pitting corrosion in Alloy 22 at any potential. Decreasing of the effective diffusion distance in a propagating crevice is thought to cause crevice corrosion stifling or repassivation after long anodic polarization. Crevice corrosion breakdown potential is expected to decrease with potential scan rate, approaching repassivation potential for low scan rates. The lowest corrosion potential of Alloy 22 in hydrochloric acid solutions at which active corrosion exists was proposed as the lowest possible repassivation potential for crevice corrosion.

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PDF-file: 30 pages; size: 1.7 Mbytes

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  • Presented at: Corrosion/2007 Conference and Exposition, Nashville, TN, United States, Mar 11 - Mar 15, 2007

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  • Report No.: UCRL-CONF-226068
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 902359
  • Archival Resource Key: ark:/67531/metadc887036

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  • November 10, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 23, 2016, 6:56 p.m.

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Carranza, R M; Rodr?guez, M A & Rebak, R B. Environmental and Geometrical Conditions to Sustain Crevice Corrosion in Alloy 22, article, November 10, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc887036/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.