Hard iron plating of aluminum/aluminum alloys using sulfamate/su

Details Hard iron plating of aluminum/aluminum alloys using sulfamate/su Hard iron plating of aluminum/aluminum alloys using sulfamate/su

1994-05-26

1996-05-14

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Agitating or moving electrolyte during coating

205187, 205258, 205259, 205270, 106 127, C23C 2802, C23C 2000, C25D 356, C25D 320

Patent

active

055164196

ABSTRACT:
Aluminum and aluminum alloy parts, such as pistons, are electroplated with iron employing a ferrous electroplating solution. The solution comprises (a) ferrous iron having a concentration ranging from about 0.65 to 2.0 Moles of Fe.sup.2+ per liter of solution; (b) at least one anion selected from the group consisting of sulfamate and ammonium sulfate and associated with the Fe.sup.2+ ions; (c) a reducing agent, such as ascorbic acid, in an amount sufficient to prevent oxidation of Fe.sup.2+ to Fe.sup.3+ ; (d) Cl.sup.- anion in an amount sufficient to promote dissolution of the iron anode; and (e) a wetting agent in an amount sufficient to prevent pitting of the aluminum cathode. The ferrous electroplating bath of the present invention permits plating of relatively thick layers of iron on aluminum, typically on the order of about 0.6 to 2 mils (0.0015 to 0.0051 cm), with a microhardness of at least about 40 (Rockwell C scale).

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O. J. Klingenmaier, "Hard Iron Plating of Aluminum Pistons", Plating, pp. 741-746 (Aug. 1974).
R. H. Williams, "Iron Plating", in Metal Finishing, Michael Murphy, Ed., pp. 223, 224, 226 (Jan. 1992).

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