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US 5,066,368 AGranted
Process for producing black integrally colored anodized aluminum components
AssigneeOlin Corporation
InventorsAnthony M. Pasqualoni, Deepak Mahulikar, Satish K. Jalota, Andrew J. Brock
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Abstract
A process for producing electronic package components from an aluminum alloy is disclosed. The components have a black color through integral color anodization. The desired color, thickness and surface finish are achieved by regulation of amperage during anodization. The amperage is rapidly raised to in excess of 70 amps per square foot and then allowed to gradually decrease as a function of oxide growth while the voltage is maintained in excess of 70 volts.
Claims18
A process for producing an anodized aluminum component, comprising the steps of:
- (a). providing said component to be an aluminum alloy capable of forming a light black to black color by integral color anodization;
- (b). anodizing said component in an electrolytic cell suitable for integral color anodization by increasing the cell voltage at a rate effective to increase the current density from zero to over a peak value in excess of about 70 amps per square foot within about 3 minutes;
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- (c). then immediately causing said current density to decrease from said peak value while thereafter maintaining a voltage in excess of about 70 volts to form a light black to black integral color anodization layer.
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Dependencies are inferred from the claim text.