Method for removing scale from silver articles using an aqueous oxalic acid solution
OwnerMattie L. Browninventor
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Abstract
A silver pickling method employing aqueous oxalic acid solutions that removes tightly adherent scale at room temperature, as well as elevated temperatures, that does not tend to plate contaminants onto silver articles due to the accumulation of copper ions in a pickle solution, and that does not aggressively attack solder joints is provided. The silver pickling method comprises the steps of contacting the surface scale of a silver article, such as jewelry, with a solution of oxalic acid and water; maintaining the solution contact with the surface scale for a period of time sufficient to loosen the scale; and removing the surface scale from the article.
Claims26
A method for removing scale from a surface of a silver-containing metal article, the method comprising the steps of:
- contacting surface scale of at least one silver-containing metal article with a solution consisting essentially of oxalic acid and water;
- maintaining the contact of the surface scale with the solution for a period of time sufficient to loosen the scale;
- and
- removing the surface scale from the silver-containing metal article.
A method for removing scale from a surface of a silver-containing metal article, the method comprising the steps of:
- contacting surface scale of at least one silver-containing metal article with a solution consisting essentially of a defoaming agent, oxalic acid and water;
- maintaining the contact of the surface scale with the solution in a tumbler for a period of time sufficient to loosen the scale;
- and
- removing the surface scale from the silver-containing metal article.
Dependencies are inferred from the claim text.