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Anodic Behavior of Alloy 22 in High Nitrate Brines at Temperatures Higher Than 100°C

[+] Author Affiliations
Gabriel O. Ilevbare

Integrated Science Solutions, Inc., Walnut Creek, CA

Robert A. Etien

Knolls Atomic Power Laboratory, Schenectady, NY

John C. Estill, Gary A. Hust, Marshall L. Stuart, Raul B. Rebak

Lawrence Livermore National Laboratory, Livermore, CA

Ahmet Yilmaz

AMRDEC/Westar, Redstone Arsenal, AL

Paper No. PVP2006-ICPVT-11-93423, pp. 591-600; 10 pages
doi:10.1115/PVP2006-ICPVT-11-93423
From:
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 7: Operations, Applications, and Components
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4758-6 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME

abstract

Alloy 22 (N06022) may be susceptible to crevice corrosion in chloride solutions. Nitrate acts as an inhibitor to crevice corrosion. Several papers have been published regarding the effect of nitrate on the corrosion resistance of Alloy 22 at temperatures 100°C and lower. However, very little is known about the behavior of this alloy in highly concentrated brines at temperatures above 100°C. In the current work, electrochemical tests have been carried out to explore the anodic behavior of Alloy 22 in high chloride high nitrate electrolytes at temperatures as high as 160°C at ambient atmospheres. Even though Alloy 22 may adopt corrosion potentials in the order of +0.5 V (in the saturated silver chloride scale), it does not suffer crevice corrosion if there is high nitrate in the solution. That is, the inhibitive effect of nitrate on crevice corrosion is active for temperatures higher than 100°C.

Copyright © 2006 by ASME
Topics: Temperature , Alloys

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