| 摘要 |
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 Fe2+ per liter of solution; (b) at least one anion selected from the group consisting of sulfamate and ammonium sulfate and associated with the Fe2+ ions; (c) a reducing agent, such as ascorbic acid, in an amount sufficient to prevent oxidation of Fe2+ to Fe3+; (d) Cl- 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).
|
