Gas phase chemical reduction of metallic branding layer of elect

Coating processes – Electrical product produced

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427 96, 427309, C23C 2600

Patent

active

052798500

ABSTRACT:
A process for removing unwanted contaminant metallic oxide from the surface of a nickel branding layer of an electronic circuit package, in order to enhance the affinity of a layer of phenolic branding ink to the surface of the metallic branding layer involves treating the surface of the metallic branding layer with a hydrogen-containing, chemical reducing gas phase ambient, so that oxygen within the surface oxide chemically combines with the hydrogen component within the ambient, so as to form readily removable water. The surface of the metallic branding layer is thereby substantially free of surface oxide, providing a greater surface area of metallic-ink bonding sites. As a consequently, a subsequently deposited layer of branding ink strongly adheres to the surface of the nickel and is not readily removed during further cleaning of the circuit package.

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patent: 3827918 (1974-08-01), Ameen
patent: 4457861 (1984-07-01), Des Marais
patent: 4479890 (1984-10-01), Prabhu
patent: 4511601 (1985-04-01), Akse
patent: 4964923 (1990-10-01), Takeuchi
patent: 5009926 (1991-04-01), Fukuda
patent: 5024734 (1991-06-01), Downs

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