Chromium plating bath for producing non-iridescent, adherent, br

Details Chromium plating bath for producing non-iridescent, adherent, br Chromium plating bath for producing non-iridescent, adherent, br

1985-03-26

1986-05-13

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

C25D 310

Patent

active

045884811

ABSTRACT:
A chromium plating bath and process for producing a non-iridescent, adherent, bright chromium deposit at high efficiencies and high temperatures under conditions such that the process is substantially free of cathodic low current density etching. The bath consists essentially of chromic acid and sulfate in predetermined concentrations, and an organic sulfonic acid or salts thereof, where the ratio of S to C is .gtoreq.1/3, e.g. methyl, ethyl and propyl sulfonic acid, and methane and 1,2-ethane disulfonic acid. The bath is substantially free of carboxylic acids, phosphonic acids, perfluoroloweralkyl sulfonic acids, and halides.

REFERENCES:
patent: 3311548 (1967-03-01), Brown et al.
patent: 3745097 (1973-07-01), Chessin et al.
patent: 3804728 (1974-04-01), Chessin et al.
patent: 3943040 (1976-03-01), Willson

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