Kabushiki Kaisha Kobe Seiko Sho

Eiki Usui

Masahiro Kawaguchi

Takashi Inaba

Hideo Fujimoto

Akihiro Tsuruno

Jun Hisamoto

Masao Takemoto

Kouki Ikeda

Nagisa Takee

Kikurou Toyose

An aluminium alloy sheet for various discs having good platability is described. The alloy consists essentially of 2 to 6 wt % of Mg, 0.1 to 0.5 wt % of Zn, 0.03 to 0.40 wt % of Cu, 0.01 to 0.30 wt % of Fe and the balance of Al.

Aluminum alloy sheet for discs having good platability

An aluminum alloy material having a surface suitable for zinc phosphate processing prepared by a process comprising the steps of (1) cleaning the aluminum alloy surface, and (2) forming a composite film layer comprising Zn metal, Ni or Mn metal, and silicon oxide on the surface of the aluminum alloy.

Aluminum alloy material having a surface of excellent zinc phosphate

Disclosed herein are: (1) a formable bake-hardening type aluminum alloy sheet, containing 0.2-0.7 wt % of Fe, 0.05-0.5 wt % of Cu, 0.5-2.5 wt % of Mg, 0.5-2.0 wt % of Mn and optionally 0.05-1 wt % of Zn under the condition of Fe wt % +(Mn wt %.times.1.07)+(Mg wt %.times.0.27).ltoreq.3.0, and intermetallic compounds of less than 45 microns in size and an areal rate of 0.5-5% as observed from the surface of a rolled sheet and an average crystal grain width smaller than 25 microns; and (2) a method for producing such bake-hardening type aluminum alloy sheets.

Aluminum alloy sheet with good forming workability and method for

A method for treating surfaces of magnetic disk substrates of aluminum alloy with an anodic oxide film on the surfaces thereof, the method comprising: dissolving part of the anodic oxide film by an etching treatment to broaden micro pores of the anodic oxide film to a diameter greater than 170 .ANG..

Growing community of inventors

Tochigi, Japan

Eiki Usui