Chemistry: electrical and wave energy – Processes and products
Patent
1981-01-07
1982-04-20
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 56R, C25D 1134
Patent
active
043257917
ABSTRACT:
Uranium articles are provided with anodized oxide coatings in an aqueous solution of an electrolyte selected from the group consisting of potassium phosphate, potassium hydroxide, ammonium hydroxide, and a mixture of potassium tetraborate and boric acid. The uranium articles are anodized at a temperature greater than about 75.degree. C. with a current flow of less than about 0.036 A/cm.sup.2 of surface area while the pH of the solution is maintained in a range of about 2 to 11.5. The pH values of the aqueous solution and the low current density utilized during the electrolysis prevent excessive dissolution of the uranium and porosity in the film or watering. The relatively high temperature of the electrolyte bath inhibits hydration and the attendant deleterious pitting so as to enhance corrosion resistance of the anodized coating.
REFERENCES:
patent: 2884364 (1959-04-01), Rebol et al.
patent: 2965551 (1960-12-01), Richaud
"The Anodic Oxidation of U", by O. Flint et al., ACTA Metallurgica, vol. 2, Sep. 1954, pp. 696-712.
Waldrop Forrest B.
Washington Charles A.
Andrews R. L.
Besha Richard G.
Hamel Stephen D.
Larcher Earl L.
The United States of America as represented by the United States
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