Kabushiki Kaisha Kobe Seiko Sho

Toyota Jidosha Kabushiki Kaisha

Kobe Alcoa Transportation Products Ltd.

Kikuo Toyose

Masao Takemoto

Jun Takigawa

Hiroshi Sato

Toshiki Ueda

Hideo Fujimoto

Jun Hisamoto

Akihiro Tsuruno

Tomohiro Nishimura

Kouki Ikeda

Souichi Hayashi

Nagisa Takee

Asao Mochizuki

Makoto Tawara

Masamichi Aono

Shunichiro Maezono

Akio Fukada

Hidetaka Oda

Toshihiro Chikada

A zincate-treated article of an Al-Mg-Si base alloy has a zincate coating film having a Zn crystal grain size of 1.0 .mu.m or smaller on an Al-Mg-Si base alloy body having a Cu content of 0.1 to 1.5 weight %. The Zn crystal grain size is preferably equal to or smaller than 0.95 .mu.m. This zincate-treated article can be manufactured by treating an Al-Mg-Si base alloy body having a Cu content of 0.1 to 1.5 weight % in a zincating treatment bath containing 100 to 300 g/l of sodium hydroxide, 5 to 20 g/l of zinc oxide, 2 to 10 g/l of iron chloride, 5 to 20 g/l of Rochelle salt and 50 to 200 ml/l of water glass at a temperature of 20.degree. to 80.degree. C. for 5 to 60 seconds. By adjusting the Zn crystal grain size in the zincating treatment in this manner, a zincate-treated article of an Al-Mg-Si base alloy having an excellent adhesion can be acquired even in a single stage zincating treatment.

Zincate-treated article of Al-Mg-Si base alloy and method of

Surface-treated Al or Al alloy materials which excel in adhesive property, formability, weldability, phosphatability, paint adhesion, and post-painting corrosion resistance are provided by forming a coated layer containing Zn and Fe or one or more of Si oxides, Al oxides and Al hydroxides together therewith, on the surface of Al or Al alloy base. The surface-treated Al or Al alloy materials are useful as metallic material to be painted and used after press forming and other processing, spot or laser welding and phosphating, including panel materials for automobiles and other various vehicles, shells for housefold electrical apparatus, and building materials.

Surface treated aluminum or aluminum alloy material

An aluminum brazing sheet for use in brazing comprises;

Aluminum brazing sheet

A vacuum brazing sheet for use in drawn-cup type heat exchanger made of aluminum with the degree of closure from 0.2 to 4.0 cm.sup.2 /l, wherein a brazing material containing:

Vacuum brazing sheet for use in aluminum heat exchanger

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Mooka, Japan

Kikuo Toyose