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Long-Term Corrosion Behavior of Alloy 22 in 5 M CaCl2 at 120°C

[+] Author Affiliations
John C. Estill, Gary A. Hust, Kenneth J. Evans, Marshall L. Stuart, Raúl B. Rebak

Lawrence Livermore National Laboratory, Livermore, CA

Paper No. PVP2006-ICPVT-11-93422, pp. 581-589; 9 pages
doi:10.1115/PVP2006-ICPVT-11-93422
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

In conditions where tight crevices exist in hot chloride containing solutions Alloy 22 may suffer crevice corrosion. The occurrence (or not) of crevice corrosion in a given environment (e.g. salt concentration and temperature), is governed by the values of the critical potential (Ecrit ) for crevice corrosion and the corrosion potential (Ecorr ). This paper discusses the evolution of Ecorr and corrosion rate (CR) of creviced Alloy 22 specimens in 5 M calcium chloride (CaCl2 ) at 120°C. Tested specimens included non-creviced rods and multiple creviced assemblies (MCA) both non-welded (wrought) and welded. Results show that Alloy 22 suffers crevice corrosion under the open circuit conditions in the aerated hot CaCl2 brine. However, after more than a year immersion the propagation of crevice corrosion was not significant. The general corrosion rate decreased or remained unchanged as the immersion time increased. For rods and MCA specimens, the corrosion rate was lower than 100 nm/year after more than a year immersion time.

Copyright © 2006 by ASME
Topics: Alloys , Corrosion

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