Active maintenance of these web resources ceased in 2012 and they will not be updated. They are posted for archival purposes only.

Topic Title: Article: Long-Term Corrosion Behavior of Alloy 22 in 5M CaCl2 at 120 C
Topic Summary: J. Estill, et. al., Livermore National Lab. Specimens included non-creviced rods and MCA, both wrought and welded
Created On: 5/17/2007 2:15 PM

 5/17/2007 2:15 PM

Lynne Robinson

Posts: 701
Joined: 2/3/2007

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 (E{sub crit}) for crevice corrosion and the corrosion potential (E{sub corr}). This paper discusses the evolution of E{sub corr} and corrosion rate (CR) of creviced Alloy 22 specimens in 5 M calcium chloride (CaCl{sub 2}) 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 CaCl{sub 2} brine. However, after more than a year of 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.

Citation: Estill, J.C., Hust, G.A., Evans, K.J., Stuart, M.L., Rebak, R.B. "Long-Term Corrosion Behavior of Alloy 22 in 5M CaCl2 at 120 C." Proceedings of 2006 Pressure Vessels and Piping Division Conference. New York: ASME, 2006.

Read Article

5500 Corporate Drive Suite 750, Pittsburgh, PA 15237 USA (directions)
Telephone 800-759-4867 (U.S. and Canada)
724-776-9000 (elsewhere)
Fax 724-776-3770 ·Email