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Stifling of Crevice Corrosion in Alloy 22 During Constant Potential Tests

[+] Author Affiliations
Ahmet Yilmaz, Raúl B. Rebak

Lawrence Livermore National Laboratory, Livermore, CA

Pasu Pasupathi

BSC, Las Vegas, NV

Paper No. PVP2005-71174, pp. 493-502; 10 pages
doi:10.1115/PVP2005-71174
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications, and Components
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4192-8 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

Artificially creviced Alloy 22 (N06022) is susceptible to crevice corrosion in presence of high chloride aqueous solution when high temperatures and high anodic potentials are applied. The presence of oxyanions in the electrolyte, especially nitrate, inhibits the nucleation and growth of crevice corrosion. Crevice corrosion may initiate when a constant potential above the crevice repassivation potential is applied. The occurrence of crevice corrosion can be divided into three characteristic domains: (1) nucleation, (2) growth and (3) stifling and arrest. That is, crevice corrosion reaches a critical stage after which growth stops and the specimens start to regain the passive behavior displayed before the nucleation of localized attack.

Copyright © 2005 by ASME

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