Chemistry: electrical and wave energy – Processes and products
Patent
1981-12-09
1985-06-25
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
134 41, 156667, 204 321, 204 33, 2041415, 252 794, 427309, C25D 534, C25F 108
Patent
active
045252505
ABSTRACT:
A method for the chemical removal of oxide layers from the surface of objects made of metals, in particular those made of titanium, titanium alloys, nickel, nickel alloys and chrome-nickel steels, so that these objects can subsequently be effectively coated with metals. The removal of the oxide layers is effected in a nonaqueous organic medium containing a mixture of hydrogen fluoride and one or more alkali fluorides and/or ammonium fluoride. By practice of this method, interfering oxide films can be removed from the surfaces of workpieces made of the above-named metals or metal alloys, while maintaining stable dimensional accuracy, prior to a subsequent coating of the workpiece with other metals, in particular metal coating compositions such as aluminum, zinc or silver.
REFERENCES:
patent: 3468774 (1969-09-01), Kendall
patent: 3562013 (1971-02-01), Mickelson et al.
patent: 4087367 (1978-05-01), Rioult et al.
patent: 4126523 (1978-11-01), Wong
patent: 4314876 (1982-02-01), Kremer et al.
Metal Finishing Guidebook and Directory for 1978, Metals and Plastics Publications, Inc., Hackensack, N.J., pp. 128-132.
Fahrmbacher-Lutz Ludwig
Seidler Klaus
Kaplan G. L.
Leader William T.
Ludwig Fahrmbacher-Lutz
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