Novel low concentration decorative chromium plating baths and me

Details Novel low concentration decorative chromium plating baths and me Novel low concentration decorative chromium plating baths and me

1978-04-07

1980-06-03

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

C25D 304

Patent

active

042060192

ABSTRACT:
A bright decorative plating process for electroplating chromium on a basis metal, characterized by high coverage and throwing power, utilizes a chromic acid plating bath containing the anion of an organic carboxylic acid or a halogenated organic carboxylic acid. The baths are of unprecedentedly high CrO.sub.3 to sulfate ratio, 600-3000:1. They may be of the self-regulating type. They contain a fluoride or complex fluoride as an auxiliary catalyst. The carboxylic acid anion may be added by introducing into the bath the acid itself, or a soluble salt of the acid, or the acid anhydride. The anions of the aliphatic dicarboxylic acids such as adipic acid and succinic acid anhydride are preferred. The concentration of the carboxylic acid anion is preferably from 0.5 to 32 grams per liter.

REFERENCES:
patent: 3074859 (1963-01-01), Latawiec et al.
patent: 3248310 (1966-04-01), Schaer
patent: 3475294 (1969-10-01), Seyb et al.
patent: 3505183 (1970-04-01), Seyb et al.
patent: 3745097 (1973-07-01), Chessin et al.

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