skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The long-term corrosion performance of Alloy 22 in heated brine solutions

Abstract

Long-term corrosion experiments have been performed on Alloy 22 (UNS N06022), in a series of heated brines formulated to represent evaporatively concentrated ground water, to evaluate the long-term corrosion performance of the material. These solutions included 0.5 M NaCl, in addition to two simulated concentrated ground water solutions. Under conditions where Alloy 22 was anticipated to be passive, the corrosion rate was found to be vanishingly small (i.e., below the resolution of the weight-loss technique used to quantify corrosion in this study). However, under low pH conditions where Alloy 22 was anticipated to be active, or more specifically, where the chromium oxide passive film was not thermodynamically stable, the corrosion rate was appreciable. Furthermore, under such conditions the corrosion rate was observed to be a strong function of temperature, with an activation energy of 72.9±1.8 kJ/mol. Time of Flight-Secondary Ion Mass Spectroscopy analysis of the oxide layer revealed that, while sulfur was present within the oxide for all test conditions, no accumulation was observed at or near the metal/oxide interface. Furthermore, these observations confirm that inhibition of passive film formation via sulfur accumulation does not occur during the corrosion of Alloy 22.

Authors:
 [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
OSTI Identifier:
1333838
Report Number(s):
SAND-2014-20152J
Journal ID: ISSN 0010-9312; 547476
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Corrosion
Additional Journal Information:
Journal Volume: 71; Journal Issue: 6; Journal ID: ISSN 0010-9312
Publisher:
NACE International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; general corrosion; mass loss; nickel alloys; nuclear waste

Citation Formats

Enos, D. G., and Bryan, C. R. The long-term corrosion performance of Alloy 22 in heated brine solutions. United States: N. p., 2015. Web. doi:10.5006/1581.
Enos, D. G., & Bryan, C. R. The long-term corrosion performance of Alloy 22 in heated brine solutions. United States. doi:10.5006/1581.
Enos, D. G., and Bryan, C. R. Fri . "The long-term corrosion performance of Alloy 22 in heated brine solutions". United States. doi:10.5006/1581. https://www.osti.gov/servlets/purl/1333838.
@article{osti_1333838,
title = {The long-term corrosion performance of Alloy 22 in heated brine solutions},
author = {Enos, D. G. and Bryan, C. R.},
abstractNote = {Long-term corrosion experiments have been performed on Alloy 22 (UNS N06022), in a series of heated brines formulated to represent evaporatively concentrated ground water, to evaluate the long-term corrosion performance of the material. These solutions included 0.5 M NaCl, in addition to two simulated concentrated ground water solutions. Under conditions where Alloy 22 was anticipated to be passive, the corrosion rate was found to be vanishingly small (i.e., below the resolution of the weight-loss technique used to quantify corrosion in this study). However, under low pH conditions where Alloy 22 was anticipated to be active, or more specifically, where the chromium oxide passive film was not thermodynamically stable, the corrosion rate was appreciable. Furthermore, under such conditions the corrosion rate was observed to be a strong function of temperature, with an activation energy of 72.9±1.8 kJ/mol. Time of Flight-Secondary Ion Mass Spectroscopy analysis of the oxide layer revealed that, while sulfur was present within the oxide for all test conditions, no accumulation was observed at or near the metal/oxide interface. Furthermore, these observations confirm that inhibition of passive film formation via sulfur accumulation does not occur during the corrosion of Alloy 22.},
doi = {10.5006/1581},
journal = {Corrosion},
number = 6,
volume = 71,
place = {United States},
year = {Fri Feb 13 00:00:00 EST 2015},
month = {Fri Feb 13 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: