Nihon Parkerizing Co., Ltd.

Aisin Seiki Kabushiki Kaisha

Jtekt Corporation

Tomoyoshi Konishi

Toshiyuki Saito

Masahiro Suzuki

Arata Suda

Takumi Mio

Masaaki Beppu

Ichiro Hiratsuka

Kazuya Nakada

Ryu Nakajima

Mie Tokuhara

Mikito Toyoshima

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

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

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Chuo-ku, Japan

Tomoyoshi Konishi