National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Electrochemically-Grown Oxides on U-NB Alloy.

DE2001766219

Publication Date	2000
Personal Author	Lillard, J.
Page Count	15
Abstract	Electrochemically-grown oxides on U-Nb alloys (2 - 8 wt. %o) were mixed oxides consisting of varying amounts of Nb205, U03(2HZO), and UOZ. Nb enhanced the passivity of U in acidic and neutral solutions through the formation of Nb205 and enrichment of Nb in the oxide. In highly acidic solutions, where U did not form a solid oxide, Nb additions greater than 8% would be required to achieve passivity. In alkaline solutions Nb did not significantly increase the passivity of the mixed oxide and there was no enrichment of Nb. U-8Nb, which had a lower I(Pass) than Nb or U in pH 10.7 solution, was the exception; the behavior is thought to be due to the unique U-8Nb phase structure. In highly alkaline solutions, Nb was shown to be an ineffective alloy element for promoting passivity because, although it formed Nb205, the oxide was non-protective.
Keywords	Electrochemical corrosion Protective coatings Uranium alloys Niobium alloys Oxidation Oxides
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	71E - Coatings, Colorants, & Finishes 71G - Corrosion & Corrosion Inhibition
Corporate Authors	Los Alamos National Lab., NM.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	W-7405-ENG-36

Electrochemically-Grown Oxides on U-NB Alloy.

Electrochemically-Grown Oxides on U-NB Alloy.
DE2001766219

Publication Date	2000
Personal Author	Lillard, J.
Page Count	15
Abstract	Electrochemically-grown oxides on U-Nb alloys (2 - 8 wt. %o) were mixed oxides consisting of varying amounts of Nb205, U03(2HZO), and UOZ. Nb enhanced the passivity of U in acidic and neutral solutions through the formation of Nb205 and enrichment of Nb in the oxide. In highly acidic solutions, where U did not form a solid oxide, Nb additions greater than 8% would be required to achieve passivity. In alkaline solutions Nb did not significantly increase the passivity of the mixed oxide and there was no enrichment of Nb. U-8Nb, which had a lower I(Pass) than Nb or U in pH 10.7 solution, was the exception; the behavior is thought to be due to the unique U-8Nb phase structure. In highly alkaline solutions, Nb was shown to be an ineffective alloy element for promoting passivity because, although it formed Nb205, the oxide was non-protective.
Keywords	Electrochemical corrosion Protective coatings Uranium alloys Niobium alloys Oxidation Oxides
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	71E - Coatings, Colorants, & Finishes 71G - Corrosion & Corrosion Inhibition
Corporate Authors	Los Alamos National Lab., NM.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	W-7405-ENG-36