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Title: Anodic Polarization Behavior of Titanium Grade 7 in Dust Deliquescence Salt Environments

Abstract

It is planned to use the highly corrosion resistant titanium grade 7 (Ti Gr 7) and a high strength titanium alloy (Ti Gr 29) to fabricate the drip shield for the Yucca Mountain repository. Ti Gr 7 contains 0.15% Palladium (Pd) to increase its corrosion performance, mainly under reducing conditions. It was important to determine the corrosion behavior of Ti Gr 7 in concentrated brines at temperatures higher than 100 C, which may represent the behavior of dust deliquescence solutions. Tests were performed in concentrated NaCl + KCl solutions containing also nitrates and fluorides. Results show that Ti Gr 7 was highly resistant to general and localized corrosion. Some specimens were polarized to potentials higher than 4 volts. None of the tightly creviced specimens suffered crevice corrosion. The presence of fluoride promoted localized corrosion around the edges of the crevice former.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
914604
Report Number(s):
UCRL-PROC-228934
TRN: US0803349
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 27, 2007
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRINES; CORROSION; CREVICE CORROSION; FLUORIDES; NITRATES; PALLADIUM; PERFORMANCE; POLARIZATION; PRESSURE VESSELS; SHIELDS; TITANIUM; TITANIUM ALLOYS; YUCCA MOUNTAIN

Citation Formats

Evans, K J, and Rebak, R B. Anodic Polarization Behavior of Titanium Grade 7 in Dust Deliquescence Salt Environments. United States: N. p., 2007. Web. doi:10.1115/PVP2007-26161.
Evans, K J, & Rebak, R B. Anodic Polarization Behavior of Titanium Grade 7 in Dust Deliquescence Salt Environments. United States. doi:10.1115/PVP2007-26161.
Evans, K J, and Rebak, R B. Fri . "Anodic Polarization Behavior of Titanium Grade 7 in Dust Deliquescence Salt Environments". United States. doi:10.1115/PVP2007-26161. https://www.osti.gov/servlets/purl/914604.
@article{osti_914604,
title = {Anodic Polarization Behavior of Titanium Grade 7 in Dust Deliquescence Salt Environments},
author = {Evans, K J and Rebak, R B},
abstractNote = {It is planned to use the highly corrosion resistant titanium grade 7 (Ti Gr 7) and a high strength titanium alloy (Ti Gr 29) to fabricate the drip shield for the Yucca Mountain repository. Ti Gr 7 contains 0.15% Palladium (Pd) to increase its corrosion performance, mainly under reducing conditions. It was important to determine the corrosion behavior of Ti Gr 7 in concentrated brines at temperatures higher than 100 C, which may represent the behavior of dust deliquescence solutions. Tests were performed in concentrated NaCl + KCl solutions containing also nitrates and fluorides. Results show that Ti Gr 7 was highly resistant to general and localized corrosion. Some specimens were polarized to potentials higher than 4 volts. None of the tightly creviced specimens suffered crevice corrosion. The presence of fluoride promoted localized corrosion around the edges of the crevice former.},
doi = {10.1115/PVP2007-26161},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 09 00:00:00 EST 2007},
month = {Fri Mar 09 00:00:00 EST 2007}
}

Conference:
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