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US 4,786,377 AGranted
Process for electroplating steel wires and coated wires thus produced
AssigneeGencord SpA
InventorsDomenico De Filippo, Leo Ambrosio
Life of this patent
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Abstract
Steel wire are electroplated with layers of copper/lead, then zinc, then nickel, followed by solid state diffusion of the layers by Joule effect.
Claims9
A process for the production of electroplated steel wires, characterized by the following series of operations:
- (a) simultaneously electrodepositing copper and lead from an alloy bath onto a steel wire,
- (b) electrodepositing zinc from a zinc plating bath,
- (c) electrodepositing nickel from a nickel plating bath,
- (d) solid state diffusion by Joule effect of the layers obtained by the electroplating steps (a), (b), and (c), a washing step being provided after each one of the electroplating operations (a), (b) and (c).
1 more element
A pyrophosphate alloy bath for electrodepositing copper and lead on steel, said bath being characterized in that it has the following composition:
- Cu(P.sub.2 O.sub.7).sub.2.sup.6- :
- 0.3-0.7 moles/l
- Pb(P.sub.2 O.sub.7).sub.2.sup.6- :
- 0.25.times.10.sup.-3 -10.times.10.sup.-3 moles/l
- P.sub.2 O.sub.7 :
- 0.1-0.2 moles/l
- HP.sub.2 O.sub.7.sup.3- :
- 0.1-0.2 moles/l
- NH.sub.3 :
- 0-0.1 moles/l
- NO.sub.3.sup.- :
- 0-0.1 moles/l
- Cu(HP.sub.2 O.sub.7).sub.2.sup.5-, CuP.sub.2 O.sub.7.sup.2-, H.sub.2 P.sub.2 O.sub.7.sup.2-, Pb(P.sub.2 O.sub.7).sup.2- trace amounts;
- Cu/P.sub.2 O.sub.7 ratio=1/7 by weight;
- pH=8.8.
12 more elements
Dependencies are inferred from the claim text.