Sumitomo Metal Industries, Inc.

Sumitomo Light Metal Industries, Ltd.

Naotaka Ueda

Yoshihiko Hoboh

Masanori Tsuji

Kazuyuki Fujita

Seiji Bando

Hiroshi Oishi

Hisao Yoshimori

A plated aluminum sheet has improved spot weldability and press-formability and is suitable for use in the manufacture of automobile bodies. The aluminum sheet has a plated coating of a metal having a melting point of about 700.degree. C. or above, e.g., Cr, Mn, Fe, Co, or Ni, an alloy of two or more of these metals, or a Zn alloy with at least one of these metals, on one or both surfaces thereof.

Plated aluminum sheet having improved spot weldability

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.

Process for zinc electroplating of aluminum strip

A process for direct zinc electroplating of aluminum strip which can be performed continuously at a high speed and a high current density. The process comprises pretreating aluminum strip by alkaline degreasing and then pickling and subjecting the pretreated aluminum strip to zinc electroplating in an acidic zinc plating bath which contains, in addition to Zn.sup.2+ ions, metal ions selected from the group consisting of Ni.sup.2+ ions and Fe.sup.2+ ions in a concentration of at least about 10 g/1 to form a Zn-Ni, Zn-Fe, or Zn-Ni-Fe alloy plated coating, which may be overlaid with another zinc electroplated coating.

Process for direct zinc electroplating of aluminum strip

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Wakayama, Japan

Naotaka Ueda