Toyota Jidosha Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

C.uyemura Co., Ltd.

Hitoshi Ozawa

Shinji Kato

Yoshio Takagi

Yasuhiro Tsuchiya

Hiroki Uchida

Keiichi Kano

Hideo Yano

Yosiomi Aoyagi

Tsuyoshi Uotani

An Fe-P alloy film is electrodeposited on a workpiece in a bath comprising 20-80 g/l ferrous ion, 0.01-15 g/l hypophosphorous acid and/or a hypophosphite, and 0.05-5 g/l aluminum ion or a bath comprising 20-80 g/l ferrous ion and 0.01-20 g/l phosphorous acid and/or a phosphite, and optionally aluminum ion at 10.degree.-80.degree. C. and 0.5-30 A/dm.sup.2. There is obtained a crack-free alloy film having a P content of 0.1 to 9.9 wt %.

Iron-phosphorus electroplating bath and electroplating method using same

A composite nickel plated sliding surface is obtained by the formation of a composite nickel plating film on a sliding surface of an automobile part such as an engine cylinder or piston by electroless nickel plating. The plating film contains at least one member of wear resistant particles having an average particle size of 0.1 to 1.0.mu. selected from SiC, TiC, WC, BC.sub.4, TiN, Al.sub.2 O.sub.3 or the like, and also at least one member of lubricating particles having an average particle size of 1 to 10.mu. selected from BN, MoS.sub.2, and Teflon. The nickel plating bath is adjusted to have a phosphorus concentration of 0.5 to 12%. When the matrix of the nickel plating film has a phosphorus concentration of 0.5 to 5%, the film hardness is improved.

Sliding surface of composite nickel-plated sliding member

An aluminum alloy cylinder block for use in a water-cooled internal combustion engine has a cylinder with a bore into which a piston is to be movably fitted. A water jacket provided on the outer side wall of the cylinder is adapted to allow the passage of water therein for cooling the engine. The depth of the water jacket from the top of the cylinder block is preferably from 0.2 to 0.5 times the length of the cylinder. A crank case has a side wall connected to the bottom of the water jacket, and a cylinder rib extends from the inside of the side wall of the crank case toward the water jacket.

Aluminum alloy cylinder block

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Shizuoka, Japan

Hitoshi Ozawa