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

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 (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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Yucca Mountain Project, Las Vegas, Nevada
Sponsoring Org.:
USDOE
OSTI Identifier:
893375
Report Number(s):
NA
MOL.20060626.0121, DC# 47520; TRN: US200625%%203
DOE Contract Number:  
NA
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HASTELLOYS; CALCIUM CHLORIDES; CREVICE CORROSION; CORROSIVE EFFECTS; CHEMICAL REACTION KINETICS

Citation Formats

J.C. Estill, G.A. Hust, K.J. Evans, M.L. Stuart, and R.B. Rebak. Long-Term Corrosion Behavior of Alloy 22 in 5M CaCl2 at 120 C. United States: N. p., 2006. Web. doi:10.2172/893375.
J.C. Estill, G.A. Hust, K.J. Evans, M.L. Stuart, & R.B. Rebak. Long-Term Corrosion Behavior of Alloy 22 in 5M CaCl2 at 120 C. United States. doi:10.2172/893375.
J.C. Estill, G.A. Hust, K.J. Evans, M.L. Stuart, and R.B. Rebak. Mon . "Long-Term Corrosion Behavior of Alloy 22 in 5M CaCl2 at 120 C". United States. doi:10.2172/893375. https://www.osti.gov/servlets/purl/893375.
@article{osti_893375,
title = {Long-Term Corrosion Behavior of Alloy 22 in 5M CaCl2 at 120 C},
author = {J.C. Estill and G.A. Hust and K.J. Evans and M.L. Stuart and R.B. Rebak},
abstractNote = {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.},
doi = {10.2172/893375},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 08 00:00:00 EDT 2006},
month = {Mon May 08 00:00:00 EDT 2006}
}

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