C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
204/96.03
C23C 14/34 (2006.01)
Patent
CA 1190512
ABSTRACT OF THE DISCLOSURE The surface of a metal article which is exposed to the atmosphere and abrasion during normal use of the article is protected from scratches and/or corrosion during such use by a thin transparent abrasion-resistant film of an inert non-metallic material such as SiO2, SiC, Si3N4, TiO2, MgO, Al2O3, Ta2O5, Nb2O5, GeO2 , spinel and selected colorless glass compositions. The protective film is preferably deposited by RF-sputtering techniques and undesirable coloration of the article by optical in- terference effects from incident light rays is avoided by properly correlating the film thickness with the refrac- tive index of the particular material used to form the film. The invention permits the use of thinner gold plating on such items as articles of expensive jewelry and bracelets and cases for fine wristwatches without detract- ing from the quality, durability or appearance of the merchandise. Alternative embodiments in which several films of various selected non-metallic inert materials are combined to form composite protective coatings that pro- vide additional cost and manufacturing advantages are also disclosed along with methods for sputter-depositing the protective films in the proper thicknesses to avoid op- tical discoloration effects, either on articles that have been previously plated with gold or which have been pro- vided with a sputter-deposited layer of gold by sequen- tially operating the sputtering apparatus.
402697
Oldham And Company
Wittnauer Worldwide L.p.
LandOfFree
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