Process for coating the face of a part made of aluminum or alumi

Details Process for coating the face of a part made of aluminum or alumi Process for coating the face of a part made of aluminum or alumi

1996-01-31

1997-07-01

Gorgos, Kathryn L.

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating contains embedded solid material

205172, 205173, 205181, 205213, 205214, 205219, 205271, 205273, C25D 1500, C25D 1104, C25D 1120, C25D 544

Patent

active

056434340

ABSTRACT:
Process for the electrolytic deposition of composite nickel onto the face of a part of a motor vehicle, in particular the bore of a casing or engine block of an internal combustion engine comprising at least three successive stages, the first being an electrochemical activation stage where the part is brought to anodic polarity in a bath containing a halogenated acid salt of nickel, the second being a stage of superactivation of the surface and the third being a stage of electrolytic deposition of a nickel layer containing particles of solid substances where the part is brought to cathodic polarity in a nickel-plating bath containing a charge of solid particles of which the diameter is advantageously between 0.5 and 5 microns and which can be of silicon carbide or any other hardening element, optionally mixed with particles of graphite.

REFERENCES:
patent: 3531379 (1970-09-01), Peach
patent: 5139586 (1992-08-01), Das
Sato, "Electroplating on Aluminum", Chemical Abstracts, vol. 108, No. 12, (Mar. 21, 1988), p. 565.
French Search Report dated Oct. 5, 1995.

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