Pretreatment of superalloys and stainless steels for electroplat

Details Pretreatment of superalloys and stainless steels for electroplat Pretreatment of superalloys and stainless steels for electroplat

1981-07-13

1983-11-01

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 32R, C25D 534

Patent

active

044128924

ABSTRACT:
Process for activating surfaces of superalloys and stainless steels prior to electroplating a metal such as chromium thereon, whereby a metal deposit having excellent adhesion to the substrate is obtained. The article is activated by anodic etching in a novel activation solution containing about 55% to 80% by volume of H.sub.2 SO.sub.4 and about 1% to 10% by volume of commercial 52% hydrofluoric acid, preferably an aqueous bath containing 65% by volume of 95-98% H.sub.2 SO.sub.4 and 5% by volume of 52% hydrofluoric acid at 30 A/dm.sup.2 and 20.degree. C. for one minute.

REFERENCES:
patent: 2044742 (1936-06-01), Armstrong et al.
patent: 3287237 (1966-11-01), Wilton
Metal Finishing Guide Book and Directory 1978, Metals and Plastics Publicons, Inc., Hackensack, N.J., pp. 202-204.

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