Zirconium coating of a substrate
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United States of America Patent
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Oct 23, 2018
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Mar 21, 2017
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Mar 21, 2017
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Abstract
This invention provides an electrolyte salt for use in an electrodeposition process for depositing Zirconium metal on a thin foil substrate. The prior art electrochemical process causes a reaction between a uranium substrate and ZrF4 species in the electrolyte that causes the formation of UFx at the substrate surface that prevents the formation of a dense uniform zirconium coating. This problem is solved by using an electrolyte salt in an electrodeposition process consisting of lithium fluoride (LiF) in a concentration ranging between about 11.5 molar percent and about 61 molar percent and one or more salts selected from the group consisting of sodium fluoride (NaF), potassium fluoride (KF), cesium fluoride (CsF), or cesium chloride (CsCL). Zirconium is added to the electrolyte salt through an addition of zirconium fluoride (ZrF4) in the range of about 1 to about 5 mass percent (w/w %). The Zr coating is of at least 98% pure Zr with a density of at least 98%.
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