Electropolishing process

Details Electropolishing process Electropolishing process

1986-09-03

1987-05-05

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25F 316

Patent

active

046630058

ABSTRACT:
An electrolytic process employing a non-toxic electrolytic solution for anodically producing a high surface luster on copper, silver, gold, and alloys of the same is disclosed. The electrolytic solution employs thiourea as the principal carrier electrolyte, which is then stabilized using large quantities (50 to 400 gram per liter) of a reducing sugar. In addition, the preferred formulation of the solution uses an activating acid to activate the thiourea solution and urea to promote the uniform dissolution of alloying elements and to provide solution conductivity. The electropolishing processes employing the electrolytic solutions are environmentally safe, operate over broad current density ranges, are rapid in operation, and are functional on irregular shapes and complex designs. Certain other acids can be substituted for the methane sulfonic acid obtaining similar results with selected alloys of gold and silver.

REFERENCES:
patent: 3389065 (1968-06-01), Shibasaki

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