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US 4,792,469 AGranted
Electroless gold plating solution
AssigneeC. Uyemura & Co., Ltd.
InventorsMasahiro Saito, Hideyuki Takami, Makoto Sato, Masayuki Kiso
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Abstract
An amine, such as a triethanol amine or ethylenediamine is added to an alkaline electroless gold plating solution comprising a gold salt and a boron-based reducing agent to deposit a gold film having good appearance and high throwing power on a workpiece at a high deposition rate.
Claims15
An alkaline electroless gold plating solution comprising:
- a gold salt,
- an amine borane reducing agent,
- an amine compound in an amount of from 10 to 200 ml/liter,
- elemental lead from a lead salt in an amount of from 0.1 to 100 ppm, and
- an alkaline hydroxide in an amount of from 10 to 100 grams/liter.
2 more elements
A method of electroless gold plating which comprises:
- conducting electroless gold plating on a workpiece by using an alkaline electroless gold plating solution comprising,
- elemental gold to form a gold salt in an amount of from 1 to 10 grams/liter,
- an amine borane reducing agent in an amount of from 1 to 20 grams/liter,
- an amine compound selected from the group consisting of trialkonal amines and ethyleneamines,
- elemental lead from a lead salt in an amount of from 10 to 100 ppm, and
- an alkaline hydroxide in an amount of from 10 to 100 grams/liter,
- wherein a gold plated film having a lemon yellow appearance and high throwing power is obtained on said workpiece at a high deposition rate.
4 more elements
Dependencies are inferred from the claim text.