Method of electroforming a gold jewelry article

Details Method of electroforming a gold jewelry article Method of electroforming a gold jewelry article

1993-12-01

1995-02-28

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electroforming or composition therefor

Ornamental article

205 73, C25D 102

Patent

active

053934059

ABSTRACT:
A method of electroforming gold jewelry articles utilizes a first gold/silver electroforming bath which is effective for depositing a relatively soft, ductile gold alloy, and a second gold/silver electroforming bath which is effective for depositing a hard, brittle gold alloy. Prior to the electroforming steps, the method includes the preliminary steps of forming a wax mandrel in a desired configuration, inserting a copper wire into the mandrel and applying a conductive lacquer onto the mandrel. The electroforming method includes the steps of alternately immersing the mandrel into the first and second electroforming baths and electroforming alternating layers of the soft and hard gold alloys over each other to form a laminated gold shell. After the last layer has been electroformed, the wax mandrel is melted and removed from the laminated gold shell thereby forming a hollow jewelry article. The alternating soft and hard layers cooperate to relieve internal stresses within the metal and thereby form a very strong and resilient metal shell. Since the laminated structure of the shell is stronger than a conventional electroformed shell, the thickness of the laminated gold shell can be reduced, and therefore the finished article can be made less expensively than a conventional gold shell.

REFERENCES:
patent: 4343684 (1982-08-01), Lechtzin
patent: 5108552 (1992-04-01), Desthomas
patent: 5172568 (1992-12-01), Senanayake

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