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US 12,454,760 B2Granted
Etchant and method of surface treatment of aluminum or aluminum alloy
AssigneeC.Uyemura & Co., Ltd.
InventorsTakuma Maekawa, Katsuhisa Tanabe, Sayuri Tanaka, Fuminori Shibayama
Life of this patent
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Abstract
The present invention aims to provide an etchant that can provide good deposition of a metal plating such as a nickel plating, despite its acidity, and a method of surface treatment of aluminum or an aluminum alloy using the etchant. Included is an etchant containing a zinc compound and a fluorine compound and having a pH of 4.5 to 6.5.
Claims7
A method of surface treatment of aluminum or an aluminum alloy, the method comprising a treatment including:
- bringing a workpiece having aluminum or an aluminum alloy on its surface into contact with an etchant to etch the workpiece, the etchant comprising at least one zinc compound and at least one fluorine compound, the etchant having a pH of 4.5 to 6.5;
- and pickling the etched workpiece.
Dependencies are inferred from the claim text.