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Title: Crevice Repassivation Potential of Alloy 22 in High-Nitrate Dust Deliquescence Type Environments

Abstract

The nitrate ion (NO{sub 3}{sup -}) is an inhibitor for crevice corrosion of Alloy 22 (N06022) in chloride (Cl{sup -}) aqueous solutions. Naturally formed electrolytes may contain both chloride and nitrate ions. The higher the ratio R = [NO{sub 3}{sup -}]/[Cl{sup -}] in the solution the stronger the inhibition of crevice corrosion. Atmospheric desert dust contains both chloride and nitrate salts, generally based on sodium (Na{sup +}) and potassium (K{sup +}). Some of these salts may deliquescence at relatively low humidity at temperatures on the order of 150 C and higher. The resulting deliquescent brines are highly concentrated and especially rich in nitrate. Electrochemical tests have been performed to explore the anodic behavior of Alloy 22 in high chloride high nitrate electrolytes at temperatures as high as 150 C at ambient atmospheres. Naturally formed brines at temperatures higher than 120 C do not induce crevice corrosion in Alloy 22 because they contain high levels of nitrate. The inhibitive effect of nitrate on crevice corrosion is still active for temperatures higher than 100 C.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
913549
Report Number(s):
UCRL-PROC-228001
TRN: US200802%%868
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 2007 ASME Pressure Vessels and Piping Division Conference, San Antonio, TX, United States, Jul 22 - Jul 26, 2007
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; AQUEOUS SOLUTIONS; BRINES; CHLORIDES; CREVICE CORROSION; DESERTS; DUSTS; ELECTROLYTES; HUMIDITY; NITRATES; POTASSIUM; PRESSURE VESSELS; SODIUM

Citation Formats

Lian, T, Gdowski, G E, Hailey, P D, and Rebak, R B. Crevice Repassivation Potential of Alloy 22 in High-Nitrate Dust Deliquescence Type Environments. United States: N. p., 2007. Web. doi:10.1115/PVP2007-26164.
Lian, T, Gdowski, G E, Hailey, P D, & Rebak, R B. Crevice Repassivation Potential of Alloy 22 in High-Nitrate Dust Deliquescence Type Environments. United States. https://doi.org/10.1115/PVP2007-26164
Lian, T, Gdowski, G E, Hailey, P D, and Rebak, R B. 2007. "Crevice Repassivation Potential of Alloy 22 in High-Nitrate Dust Deliquescence Type Environments". United States. https://doi.org/10.1115/PVP2007-26164. https://www.osti.gov/servlets/purl/913549.
@article{osti_913549,
title = {Crevice Repassivation Potential of Alloy 22 in High-Nitrate Dust Deliquescence Type Environments},
author = {Lian, T and Gdowski, G E and Hailey, P D and Rebak, R B},
abstractNote = {The nitrate ion (NO{sub 3}{sup -}) is an inhibitor for crevice corrosion of Alloy 22 (N06022) in chloride (Cl{sup -}) aqueous solutions. Naturally formed electrolytes may contain both chloride and nitrate ions. The higher the ratio R = [NO{sub 3}{sup -}]/[Cl{sup -}] in the solution the stronger the inhibition of crevice corrosion. Atmospheric desert dust contains both chloride and nitrate salts, generally based on sodium (Na{sup +}) and potassium (K{sup +}). Some of these salts may deliquescence at relatively low humidity at temperatures on the order of 150 C and higher. The resulting deliquescent brines are highly concentrated and especially rich in nitrate. Electrochemical tests have been performed to explore the anodic behavior of Alloy 22 in high chloride high nitrate electrolytes at temperatures as high as 150 C at ambient atmospheres. Naturally formed brines at temperatures higher than 120 C do not induce crevice corrosion in Alloy 22 because they contain high levels of nitrate. The inhibitive effect of nitrate on crevice corrosion is still active for temperatures higher than 100 C.},
doi = {10.1115/PVP2007-26164},
url = {https://www.osti.gov/biblio/913549}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 08 00:00:00 EST 2007},
month = {Thu Feb 08 00:00:00 EST 2007}
}

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