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

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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 ... continued below

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Evans, K J & Rebak, R B March 9, 2007.

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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.

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PDF-file: 10 pages; size: 0.4 Mbytes

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  • Presented at: 2007 ASME Pressure Vessels and Piping Division Conference, San Antonio, TX, United States, Jul 22 - Jul 27, 2007

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  • Report No.: UCRL-PROC-228934
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 914604
  • Archival Resource Key: ark:/67531/metadc880130

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  • March 9, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 2, 2016, 8:13 p.m.

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Evans, K J & Rebak, R B. Anodic Polarization Behavior of Titanium Grade 7 in Dust Deliquescence Salt Environments, article, March 9, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880130/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.