Electrolytic coloring of anodized aluminium by means of optical

Details Electrolytic coloring of anodized aluminium by means of optical Electrolytic coloring of anodized aluminium by means of optical

1976-07-09

1978-01-03

Herbert, Jr., Thomas J.

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Physical dimension specified

204 35N, 204 58, 428141, 428403, 428469, C25D 500, C25D 524, B32B 300

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active

040668169

ABSTRACT:
Anodized aluminium having an anodic oxide film of at least 3 microns thickness is colored by electrolytically depositing inorganic pigment from metallic salt solutions, particularly nickel, cobalt, tin and copper salts and mixtures. The pigment deposits are characterized by outer ends of an average size in excess of 260 A lying at a distance of 500 - 3000 A from the aluminium/aluminium oxide interface.
In a preferred method of production the anodic oxide coating is formed under conventional anodizing conditions in a sulphuric acid-based electrolyte. The anodized aluminium is then treated in phosphoric acid at a voltage of 8 - 50 volts to enlarge the pores to above 260 A in a region at the base of the pores adjacent the barrier layer. The pigment is then deposited in the pores to the specified depth and interesting new color shades are obtained as a result of optical interference due to the presence of the large size shallow inorganic pigment deposits.

REFERENCES:
patent: RE28506 (1975-08-01), Quaintance et al.
patent: 3382160 (1968-05-01), Asada et al.
patent: 4013465 (1977-03-01), Clapham et al.
Wood et al., "The Anodizing of Aluminum in Sulphate Solutions" in Electrochimica Acta. (1970), vol. 15, pp. 1865-1876.

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