Browse Prior Art Database

Continuous Gold Plating of Fine Wire

IP.com Disclosure Number: IPCOM000084647D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Limeri, J: AUTHOR [+2]

Abstract

Gold plated fine copper alloy wire as small as 1.5 to 2.5 mils diameter can be provided by an in-line process having the following steps:.

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Continuous Gold Plating of Fine Wire

Gold plated fine copper alloy wire as small as 1.5 to 2.5 mils diameter can be provided by an in-line process having the following steps:.

1. The wire to be plated is first cleaned by trichloroethylene vapor degrease and ultrasonic acid cleaning (5-10% citric acid), followed by two water rinses, in respective tanks having air seals at their entrances and exits.

2. Next, it is given a gold "strike" coating, using an air sealed strike solution, preceded by a contact wheel and followed by another water rinse.

3. The main gold coating is then electroplated onto the wire in a plating bath preceded by a contact wheel, with the following parameters for the bath:
a) A high-gold content.
b) A high-plating temperature of 170 - 175 degrees F.
c) A high-current density averaging approximately 50 amps/FT/2/.
d) Wire speed at 5 - 10 FT/Min through a 5-foot plating

station.
e) The adjusted bath is maintained at a PH of 5.7 to 6.0 and

a specific gravity of 23-25 degrees beaume by addition of other

salts.

4. Finally, the wire passes through another water rinse and an air dry station.

During the entire process the wire i; maintained in a straight line from a payoff reel at the beginning to a capstan at the end, so that cold working is avoided.

This process enables rapid deposition of gold at a rate of 100 - 280 microinches per minute.

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