Titanium alloy degradation modes are reviewed in relation to their performance in the repository environments. General corrosion, localized corrosion, stress corrosion cracking, hydrogen induced cracking, microbially influenced corrosion, and radiation-assisted corrosion of Ti alloys are considered. With respect to the Ti Grade 7 drip shields used in the repository at Yucca Mountain, general corrosion, hydrogen induced cracking, and radiation-assisted corrosion will not lead to failure within the 10,000 year regulatory period; stress corrosion cracking (in the absence of disruptive events) is of no consequence to barrier performance; and localized corrosion and microbially influenced corrosion are not expected to occur. To facilitate the discussion, Ti Grades 2, 5, 7, 9, 11, 12, 16, 17, 18, and 24 are included in this review.

Subject
Acids, Absorption, Corrosion rate, Yucca mountain, Passive films, Hydrogen absorption, Oxide films, Lead, Acidity, Titanium, Titanium alloys, Corrosion potential, Hydrogen
Keywords:
Titanium, Chemical composition, Mechanical property, Repository environments, Alloying elements, Palladium, Passive film, Hydrogen induced cracking, General corrosion, Localized corrosion
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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