METHOD FOR ANODIZING ALUMINUM MEMBER

PROBLEM TO BE SOLVED: To provide a method for anodizing an aluminum member in which a formation rate of an anodized film is accelerated so that an anodization step can be carried out on-line and synchronized with other steps. SOLUTION: The method for anodizing the aluminum member includes the steps...

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Hauptverfasser:	KOJIMA TOSHIYA, IO KENJI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMISTRY ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for anodizing an aluminum member in which a formation rate of an anodized film is accelerated so that an anodization step can be carried out on-line and synchronized with other steps. SOLUTION: The method for anodizing the aluminum member includes the steps of: immersing the aluminum member being the object to be treated in a treatment bath; sending a DC current to the treatment bath at an early stage until the bath voltage reaches a predetermined value (I); and sending a DC current with a superimposed AC current, in which a high-frequency current is superimposed on the DC current, to the treatment bath after the bath voltage reaches the predetermined value (II). The current density of the DC current is 50-120 A/dm2and the frequency of the high-frequency current is 5,000-15,000 Hz. COPYRIGHT: (C)2010,JPO&INPIT