Coating processes – With post-treatment of coating or coating material – Liquid extraction of coating constituent or cleaning coating
Patent
1973-11-09
1976-01-13
Esposito, Michael F.
Coating processes
With post-treatment of coating or coating material
Liquid extraction of coating constituent or cleaning coating
427 88, 427 92, 427380, 427383, 427436, 106 1, B05D 300, C09D 500
Patent
active
039326853
ABSTRACT:
A process for the stabilization of an aluminum part, such as a semiconductor lead frame, which includes the step of coating said aluminum part with an alcohol solution containing boron, phosphorous and a metal selected from the group consisting of gold, palladium, rhodium and platinum. The solution is prepared by mixing phosphorous pentoxide in an alcohol solvent. The dissolution of the phosphorous pentoxide is exothermic and the temperature of the solution will rise during the reaction. Then, boric anhydride and a salt of gold, palladium, rhodium or platinum is added. The solution strips any aluminum oxide from the surface of the part while also removing any organic contamination and while depositing a layer of the gold, platinum, rhodium or palladium onto the surface of the aluminum part. The process is particularly advantageous for preparing aluminum lead frames for wire bonding during semiconductor device assembly.
REFERENCES:
patent: 3458344 (1969-07-01), Little
patent: 3463646 (1969-08-01), Little
patent: 3672964 (1972-06-01), Bellis
patent: 3689292 (1972-09-01), Preston
patent: 3738849 (1973-06-01), Bellis
patent: 3770498 (1973-11-01), Flowers
Esposito Michael F.
Motorola Inc.
Olsen Henry T.
Weiss Harry M.
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