Aluminum Company of America

Alcoa Inc.

David A Linde

Ralph R Sawtell

Roberto J Rioja

Daniel L Serafin

Robert E Bombalski

Albert L Askin

Gregory B Venema

Paul B Schultz

Dirk C Mooy

Paula A Hinds

Francine S Bovard

Improved 5xxx aluminum alloys and products made therefrom are disclosed. The new 5xxx aluminum alloy products may achieve an improved combination of properties due to, for example, the presence of copper. In one embodiment, the new 5xxx aluminum alloy products are able to achieve an improved combination of properties by solution heat treatment.

5XXX aluminum alloys and wrought aluminum alloy products made therefrom

A process for making an aluminum alloy lighting sheet product having a reflective surface protected by a UV-stable polymer coating. An aluminum alloy sheet is chemically brightened in an aqueous acidic solution, conversion coated, and then coated with a UV-stable polymer. Alternatively, an aluminum alloy sheet is chemically etched in an aqueous alkaline solution, conversion coated, and then coated with a UV-stable polymer. Preferably, the UV-stable polymer contains about 0.5-10 wt. % amorphous silica particles. In another embodiment, an aluminum alloy sheet surface is cleaned, chemically conversion coated and then coated with a coating composition containing a UV-stable polymer and 0.5-10 wt. % of about 0.5-5 microns.

Manufacturing clear coated aluminum alloy lighting sheet

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Bettendorf, IA, United States of America

David A Linde