Chromium Plating
a technology of chromium plating and substrate, applied in the direction of superimposed coating process, coating, vacuum evaporation coating, etc., can solve the problems of difficult control, unstable trivalent chromium electroplating bath, toxic and carcinogenic,
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[0028]Although electrodeposition from a trivalent chromium bath and PVD are well-known individually, we have found that the following are the optimum conditions for achieving the required blue sheen to a chromium deposit using the present invention. However, these conditions are not intended to limit the claims.
[0029]A substrate may be pre-treated with one or more base layers, e.g. at least one nickel layer; in the case of a substrate made of plastic, an electrically conductive surface layer must be applied to the insulating plastic surface as described above. The substrate may be, for example, a plastic moulding, a zinc die cast, a cast or machined brass part or a machined steel part. The substrate is then subjected to trivalent chromium plating followed by PVD of chromium under the conditions described below:
Trivalent Chromium PlatingBath composition:trivalent chromiumTemperature: 20° C.-50° C.Bath Acidity (pH):2.8-3.8Current Density: 5-20 A / dm2Electroplating Time: 2-6 minsThick...
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