Process for the preparation of noble metal coated non-noble meta

Details Process for the preparation of noble metal coated non-noble meta Process for the preparation of noble metal coated non-noble meta

1993-06-30

1995-12-19

Bell, Mark L.

Coating processes

Immersion or partial immersion

Metal base

4274431, 106 118, 106 119, 106 121, B05D 118

Patent

active

054766885

ABSTRACT:
A multi-coating step immersion coating process for producing a coating of a noble metal on a non-noble metal substrate, wherein the noble metal is of a predetermined amount expressed as a percent of the total weight of coated product, and wherein the non-noble metal substrate is in the form of fine particles or a powder is disclosed. The process also utilizes inter-plating step and post-plating step rinsing step sequences which together with the use of the plurality of coating steps consistently results in high quality product having a uniform coating, excellent corrosion resistance and excellent electrical conductivity. Use of the coated products produced according to the process in a variety of electrically conductive compositions, including plastics, adhesives and inks, and in plastic and resin based electromagnetic shielding materials is also disclosed.

REFERENCES:
patent: 3202488 (1965-08-01), Ehrreich et al.
patent: 3212917 (1965-10-01), Tsu et al.
patent: 3589916 (1971-06-01), McCormack
patent: 3725308 (1973-04-01), Ostolski
patent: 3993808 (1976-11-01), Inaba et al.
patent: 4567066 (1986-01-01), Schultz et al.
patent: 4643918 (1987-02-01), Orban
IBM Technical Disclosure Bulletin vol. 31 No. 6 Nov. 1988 "Copper Surface Preparation Process for Electronless Plating" pp. 339-340.
Metal Finishing Guidebook Directory For 1967, Metals and Plastics Publications, Inc., Westwood, New Jersey (1967), p. 485 no month.

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