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Environmental and Geometrical Conditions to Sustain Crevice Corrosion in Alloy 22 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
PDF-file: 30 pages; size: 1.7 Mbytes
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
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⁻) 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/cm² to 20 mA/cm². 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.
Report Numbers
E 1.99:ucrl-conf-226068
ucrl-conf-226068
Subject(s)
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Note
Published through SciTech Connect.
11/10/2006.
"ucrl-conf-226068"
Presented at: Corrosion/2007 Conference and Exposition, Nashville, TN, United States, Mar 11 - Mar 15, 2007.
Rebak, R B; Carranza, R M; Rodr?guez, M A.
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14446627