ELECTROLYTIC PIGMENTATION METHOD OF ALUMINUM OR ALUMINUM ALLOY

PURPOSE:To obtain stably a light-colored film, by electrolyzing anodically oxidized Al or Al alloy with an electric current having a prescribed wave-form to make the height of metal deposited in the pores as uniform as possible. CONSTITUTION:An anodic oxide film is formed on the surface of Al or Al...

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Bibliographische Detailangaben
Hauptverfasser:	HINOTA YUUJI, OOI YOSHIKO
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:	PURPOSE:To obtain stably a light-colored film, by electrolyzing anodically oxidized Al or Al alloy with an electric current having a prescribed wave-form to make the height of metal deposited in the pores as uniform as possible. CONSTITUTION:An anodic oxide film is formed on the surface of Al or Al alloy by DC electrolysis in a bath such as sulfuric acid. The Al or Al alloy having the formed oxide film is immersed in a soln. for electrolytic pigmentation, and it is electrolyzed with an electric current having a wave-form repeating 3-60 millisec. negative current and 10-1,000 times as long positive current as the negative current. The barrier layer 1 has no ununiformity, the height of metal 2 deposited in the pores is made uniform, and the interference effect is improved, so a light-colored film is stably obtd.