Title:
ANODIC OXIDATION METHOD
Document Type and Number:
Japanese Patent JPS6415395
Kind Code:
A
Abstract:
PURPOSE:To form an anodic oxide film having satisfactory practical characteristics on an Al alloy casting when the casting is anodically oxidized, by removing the casting surface of a contact part of the casting brought into contact with a power supplying jig so as to adhere the casting to an electrode as the jig and to improve the electrical conductivity. CONSTITUTION:A cylindrical Al alloy casting 1 has an internal normal structure 8, a fine grained structure 7 formed on the surface of the structure 8 by a pouring and a chilled layer 6 formed on the structure 7 by rapid solidification. When the casting 1 is brought into partial contact with a power supplying jig 4 before anodic oxidation, the casting surface of a contact part of the casting 1 is shaved off and the jig 4 is brought into contact with the shaved surface 3. The casting 1 is then anodically oxidized. By this method, current density in constant-current electrolysis can be increased without producing a burning on the surface of alumite, current efficiency is improved and a uniform film is formed.
Inventors:
MAEJIMA SEIJU
SAITOU REIJI
SARUWATARI KOICHI
SAITOU REIJI
SARUWATARI KOICHI
Application Number:
JP16888187A
Publication Date:
January 19, 1989
Filing Date:
July 08, 1987
Export Citation:
Assignee:
FUJIKURA LTD
International Classes:
C25D11/04; C25D11/16; (IPC1-7): C25D11/04; C25D11/16
Attorney, Agent or Firm:
Takeuchi Mamoru