Nihon Parkerizing Co., Ltd.

Henkel Corporation

Aisin Seiki Kabushiki Kaisha

Jtekt Corporation

Neturen Co., Ltd.

Arata Suda

Tomoyoshi Konishi

Takao Ogino

Toshiyuki Saito

Masahiro Suzuki

Takayuki Aoki

Kazuhiro Kawasaki

Takumi Mio

Yoshitaka Misaka

Masaaki Beppu

Ichiro Hiratsuka

Kengo Fukazawa

Mitsuyuki Koga

Mikito Toyoshima

Takao Ogina

Teruaki Izaki

Yoshio Shindou

Motoo Kabeya

Makoto Yoshida

Yoshihiro Ikeda

Mie Tokuhara

The electrolysis solution for electrolytic ceramic coating includes water, a water-soluble zirconium compound, a complexing agent, carbonate ion, and at least one member selected from the group consisting of an alkali metal ion, ammonium ion and an organic alkali. Te zirconium compound is included at a concentration (X) in terms of zirconium of 0.0001 to 1 mol/L, the complexing agent is included at a concentration (Y) of 0.0001 to 0.3 mol/L, the carbonate ion is included at a concentration (Z) of 0.0002 to 4 mol/L, a ratio of the concentration (Y) of the complexing agent to the concentration (X) in terms of zirconium (Y/X) is at least 0.01, a ratio of the concentration (Z) of the carbonate ion to the concentration (X) in terms of zirconium (Z/X) is at least 2.5, and the electrolysis solution has an electrical conductivity of 0.2 to 20 S/m.

Method of electrolytic ceramic coating for metal, electrolysis solution for electrolytic ceramic coating for metal, and metallic material

An aluminum alloy member includes a main body including an aluminum alloy serving as a base material, and an electrolytic oxidation ceramic coating coated at a portion of a surface of the main body and including a most outer layer and an inner layer which is arranged close to the main body relative to the most outer layer, the inner layer in which an aluminum oxide is richer than the most outer layer, the most outer layer in which a volume of a titanium oxide or a total volume of the titanium oxide and a zirconium oxide is richer than the inner surface.

Aluminum alloy member and method for manufacturing same

Providing an iron and steel material having quenched surface part, avoiding oxidation of a compound layer formed on the surface of the iron and steel material due to quenching, its production method, and an induction-quenched component. A quenched iron and steel materialcomprises an iron and steel material, a compound layerformed on the iron and steel material, and an antioxidant cover layerformed on the compound layer. The iron and steel materialhas a hardened layer having a given depth, and the surface of the iron and steel materialhas enhanced hardness. A method for producing the iron and steel materialcomprises a first step for forming the antioxidant cover layerto cover the compound layerformed on the iron and steel material, and a second step for applying induction hardening to the iron and steel materialhaving the compound layerand the antioxidant cover layer, with the temperature increased in a given heating time until the given heating temperature is reached, and with cooling immediately performed once the heating temperature is reached.

Iron and steel material having quenched surface layer part, method for producing the iron and steel material, and quenched component

An oil pump has: a base part having a working chamber; and a rotor provided rotatably in the working chamber. The base part is configured by a plurality of split bodies. At least one of the plurality of split bodies is made of aluminum alloy, and on which an opposed sliding surface made of a ceramic film is formed. The ceramic film of the opposed sliding surface has a hardness of approximately Hv 500 to 1100 and a surface roughness of approximately 2 to 8 micrometers, and contains &#x3b1;-alumina and zirconia.

Rotary device and oil pump having &#x3b1;-alumina and zirconia coating

Composition and method for chromating treatment of metal

Method for chromating treatment of zinc coated steel

A chromating liquid for forming a chromate film on a Zn or Zn-alloy plated steel sheet, is prepared by adding and mixing a silane coupling agent in a molar ratio of from 0.05 to 0.3 relative to Cr.sup.6+ contained in an aqueous chromating liquid which contains 1-30 g/l of Cr.sup.6+ and 1-30 g/l of Cr.sup.3+ at a weight ratio of Cr.sup.6+ /Cr.sup.3+ ranging from 0.1 to 2.0; and further contains 1-59 g/l of hydrofluoric acid and 1-59 g/l of phosphoric acid at total of hydrofluoric acid and phosphoric acid ranging from 2 to 60 g/l and at a weight ratio of (fluoride ions+phosphate ions)/Cr.sup.3+ ranging from 0.5 to 3.5. and, further said chromating liquid is applied on a surface of the zinc-based plated steel sheet and is then dried, thereby forming the chromate film having a coating amount of from 10 to 150 mg/m.sup.2 in terms of the chromium.

Chromating method of zinc-based plated steel sheet

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Chuo-ku, Japan

Arata Suda