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Process for Anodizing Wrought Aluminum Alloys

IP.com Disclosure Number: IPCOM000049092D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Mahmoud, IS: AUTHOR

Abstract

The present process provides a new anodization process for aluminum which offers savings because of the reduction in processing steps, material and time. The process eliminates the traditional preliminary alkaline etch step used in the anodization of aluminum. Instead, the initial etch step involves an acid etch of the following composition: Phosphoric acid (concentrated) 80 pct. volume Nitric acid (concentrated) 5 pct. volume Citric acid 3 pct, volume Water 14 pct. volume.

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Process for Anodizing Wrought Aluminum Alloys

The present process provides a new anodization process for aluminum which offers savings because of the reduction in processing steps, material and time. The process eliminates the traditional preliminary alkaline etch step used in the anodization of aluminum. Instead, the initial etch step involves an acid etch of the following composition: Phosphoric acid (concentrated) 80 pct. volume

Nitric acid (concentrated) 5 pct. volume

Citric acid 3 pct, volume

Water 14 pct. volume.

In addition to the above advantages, the esthetic or decorative value of the anodic coating produced by the above-mentioned acid etch is better than conventional anodization coatings because the coating is both uniform and transparent.

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