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Title: Method for providing uranium articles with a corrosion resistant anodized coating

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.

Inventors:
 [1];  [2]
  1. Powell, TN
  2. Oak Ridge, TN
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
864182
Patent Number(s):
US 4325791
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; providing; uranium; articles; corrosion; resistant; anodized; coating; provided; oxide; coatings; aqueous; solution; electrolyte; selected; consisting; potassium; phosphate; hydroxide; ammonium; mixture; tetraborate; boric; acid; temperature; 75; degree; current; flow; 036; cm; surface; ph; maintained; range; 11; values; density; utilized; electrolysis; prevent; excessive; dissolution; porosity; film; watering; relatively; bath; inhibits; hydration; attendant; deleterious; pitting; enhance; resistance; ammonium hydroxide; anodized coating; prevent excessive; corrosion resistance; oxide coating; current density; corrosion resistant; boric acid; aqueous solution; current flow; potassium hydroxide; ph value; ph values; providing uranium; uranium articles; oxide coatings; potassium phosphate; prevent excess; /205/

Citation Formats

Waldrop, Forrest B, and Washington, Charles A. Method for providing uranium articles with a corrosion resistant anodized coating. United States: N. p., 1982. Web.
Waldrop, Forrest B, & Washington, Charles A. Method for providing uranium articles with a corrosion resistant anodized coating. United States.
Waldrop, Forrest B, and Washington, Charles A. Fri . "Method for providing uranium articles with a corrosion resistant anodized coating". United States. https://www.osti.gov/servlets/purl/864182.
@article{osti_864182,
title = {Method for providing uranium articles with a corrosion resistant anodized coating},
author = {Waldrop, Forrest B and Washington, Charles A},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/864182}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

Patent:

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