Process for zinc electroplating of aluminum strip
First Claim
1. A process for zinc electroplating and press forming of aluminum strip into an automobile body panel comprising sequential steps of subjecting aluminum strip to anodic electrolysis in an acidic solution so as to form a porous aluminum oxide coating on the aluminum strip, forming a zinc coating on the aluminum strip by cathodic electrolysis in an acidic zinc plating bath, and press forming the aluminum strip into an automobile body panel, the acidic solution being an acidic plating bath solution used in the subsequent cathodic electrolysis.
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Abstract
A process for zinc electroplating of aluminum strip which can be performed continuously at a high speed and a high current density. The process comprises subjecting aluminum strip to anodic electrolysis in an acidic solution which may be an acidic plating bath solution or a pickling solution before the strip is subjected to cathodic electrolysis in an acidic zinc plating bath to perform zinc electroplating.
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Citations
17 Claims
- 1. A process for zinc electroplating and press forming of aluminum strip into an automobile body panel comprising sequential steps of subjecting aluminum strip to anodic electrolysis in an acidic solution so as to form a porous aluminum oxide coating on the aluminum strip, forming a zinc coating on the aluminum strip by cathodic electrolysis in an acidic zinc plating bath, and press forming the aluminum strip into an automobile body panel, the acidic solution being an acidic plating bath solution used in the subsequent cathodic electrolysis.
- 9. A process for zinc electroplating and press forming of aluminum strip comprising sequential steps of pretreating aluminum strip by alkaline degreasing, pickling the aluminum strip, subjecting the aluminum strip to anodic electrolysis in an acidic solution so as to form a porous aluminum oxide coating on the aluminum strip, zinc electroplating the aluminum strip by cathodic electrolysis in an acidic zinc plating bath, and press forming the aluminum strip, the acidic solution being an acidic plating bath solution used in the subsequent cathodic electrolysis.
Specification