Method of manufacturing an aluminum product
First Claim
1. A method of manufacturing an Al or Al alloy workpiece, which method comprises the steps of (a) providing an Al or Al alloy workpiece, (b) pre-treating of the outersurface of the Al or Al alloy workpiece, and (c) plating a metal layer comprising nickel onto said outersurface of the Al or Al alloy workpiece, wherein during step (c) said metal layer comprising nickel is deposited by plating both nickel and bismuth using an aqueous bath having a pH in the range of 2.5 to 10, and comprising a nickel-ion concentration in a range of 10 to 100 g/l, a bismuth-ion concentration in the range of 0.01 to 10 g/l, a citrate-ion concentration in the range of 40 to 150 g/l, a gluconate-ion concentration in the range of 2 to 80 g/l, a chloride- or fluoride-ion concentration in the range of 1 to 50 g/l.
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Accused Products
Abstract
The invention relates to a method of manufacturing an Al or Al alloy workpiece, including the steps of (a) providing an Al or Al alloy workpiece, (b) pre-treating of the outersurface of the Al or Al alloy workpiece, and (c) plating a metal layer including nickel onto the outersurface of the pre-treated Al or Al alloy workpiece. During step (c) the metal layer including nickel is deposited by electroplating both nickel and bismuth using an aqueous bath comprising a nickel-ion concentration in a range of 10 to 100 g/l and a bismuth-ion concentration in the range of 0.01 to 10 g/l. The invention further relates to an aqueous plating bath for use in the method of this invention.
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Citations
26 Claims
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1. A method of manufacturing an Al or Al alloy workpiece, which method comprises the steps of (a) providing an Al or Al alloy workpiece, (b) pre-treating of the outersurface of the Al or Al alloy workpiece, and (c) plating a metal layer comprising nickel onto said outersurface of the Al or Al alloy workpiece, wherein during step (c) said metal layer comprising nickel is deposited by plating both nickel and bismuth using an aqueous bath having
a pH in the range of 2.5 to 10, and comprising a nickel-ion concentration in a range of 10 to 100 g/l, a bismuth-ion concentration in the range of 0.01 to 10 g/l, a citrate-ion concentration in the range of 40 to 150 g/l, a gluconate-ion concentration in the range of 2 to 80 g/l, a chloride- or fluoride-ion concentration in the range of 1 to 50 g/l.
- 17. An aqueous bath for the electrodeposition of a layer of nickel and bismuth on an Al or Al alloy workpiece, having a pH in the range of 2.5 to 10, and comprising a nickel-ion concentration in a range of 10 to 100 g/l, a bismuth-ion concentration in the range of 0.01 to 10 g/l, a citrate-ion concentration in the range of 50 to 150 g/l, a gluconate-ion concentration in the range of 2 to 80 g/l, a chloride- or fluoride-ion concentration in the range of 1 to 50 g/l.
Specification