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Title: Anodic Behavior of Alloy 22 in Calcium Chloride and in Calcium Chloride Plus Calcium Nitrate Brines

Abstract

Alloy 22 (UNS N60622) is a nickel-based alloy, which is extensively used in aggressive industrial applications, especially due to its resistance to localized corrosion and stress corrosion cracking in high chloride environments. The purpose of this work was to characterize the anodic behavior of Alloy 22 in concentrated calcium chloride (CaCl{sub 2}) brines and to evaluate the inhibitive effect of nitrate, especially to localized corrosion. Standard electrochemical tests such as polarization resistance and cyclic polarization were used. Results show that the corrosion potential of Alloy 22 was approximately -360 mV in the silver-silver chloride (SSC) scale and independent of the tested temperature. Cyclic polarization tests showed that Alloy 22 was mainly susceptible to localized attack in 5 M CaCl{sub 2} at 75 C and higher temperatures. The addition of nitrate in a molar ratio of chloride to nitrate equal to 10 increased the onset of localized corrosion to approximately 105 C. The addition of nitrate to the solution also decreased the uniform corrosion rate and the passive current of the alloy.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15005081
Report Number(s):
UCRL-JC-153056
TRN: US0401551
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 2003; Conference: 2003 American Society of Mechanical Engineers Pressure Vessels and Piping Conference, Cleveland, OH (US), 07/20/2003--07/24/2003; Other Information: PBD: 13 May 2003
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 43 PARTICLE ACCELERATORS; ALLOYS; BRINES; CALCIUM CHLORIDES; CALCIUM NITRATES; CHLORIDES; CORROSION; ENGINEERS; NITRATES; POLARIZATION; PRESSURE VESSELS; STRESS CORROSION; SUPERCONDUCTING SUPER COLLIDER

Citation Formats

Evans, K J, Day, S D, Ilevbare, G O, Whalen, M T, King, K J, Hust, G A, Wong, L L, Estill, J C, and Rebak, R B. Anodic Behavior of Alloy 22 in Calcium Chloride and in Calcium Chloride Plus Calcium Nitrate Brines. United States: N. p., 2003. Web. doi:10.1115/PVP2003-2140.
Evans, K J, Day, S D, Ilevbare, G O, Whalen, M T, King, K J, Hust, G A, Wong, L L, Estill, J C, & Rebak, R B. Anodic Behavior of Alloy 22 in Calcium Chloride and in Calcium Chloride Plus Calcium Nitrate Brines. United States. https://doi.org/10.1115/PVP2003-2140
Evans, K J, Day, S D, Ilevbare, G O, Whalen, M T, King, K J, Hust, G A, Wong, L L, Estill, J C, and Rebak, R B. 2003. "Anodic Behavior of Alloy 22 in Calcium Chloride and in Calcium Chloride Plus Calcium Nitrate Brines". United States. https://doi.org/10.1115/PVP2003-2140. https://www.osti.gov/servlets/purl/15005081.
@article{osti_15005081,
title = {Anodic Behavior of Alloy 22 in Calcium Chloride and in Calcium Chloride Plus Calcium Nitrate Brines},
author = {Evans, K J and Day, S D and Ilevbare, G O and Whalen, M T and King, K J and Hust, G A and Wong, L L and Estill, J C and Rebak, R B},
abstractNote = {Alloy 22 (UNS N60622) is a nickel-based alloy, which is extensively used in aggressive industrial applications, especially due to its resistance to localized corrosion and stress corrosion cracking in high chloride environments. The purpose of this work was to characterize the anodic behavior of Alloy 22 in concentrated calcium chloride (CaCl{sub 2}) brines and to evaluate the inhibitive effect of nitrate, especially to localized corrosion. Standard electrochemical tests such as polarization resistance and cyclic polarization were used. Results show that the corrosion potential of Alloy 22 was approximately -360 mV in the silver-silver chloride (SSC) scale and independent of the tested temperature. Cyclic polarization tests showed that Alloy 22 was mainly susceptible to localized attack in 5 M CaCl{sub 2} at 75 C and higher temperatures. The addition of nitrate in a molar ratio of chloride to nitrate equal to 10 increased the onset of localized corrosion to approximately 105 C. The addition of nitrate to the solution also decreased the uniform corrosion rate and the passive current of the alloy.},
doi = {10.1115/PVP2003-2140},
url = {https://www.osti.gov/biblio/15005081}, journal = {},
number = ,
volume = 2003,
place = {United States},
year = {2003},
month = {5}
}

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