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Black anodized aluminum discoloration at high temperatures

May 2, 2008

We had some black anodized alumnimum parts that we need to expose at 200 °C for 3 days. We need them to remain black.
We have obeserved different grades of discoloration on the parts from parts that do not discolor at all up to light golden yellow.
Is there a solution for it?

48675

Lourdes Rojas
industrialist - Mississauga, Ontario, Canada

Organic dye cannot withstand those high temperatures. You must use special alloy metal and one of the "architechtural" processes from Alcoa, Reynolds, or Kaiser.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

May 5, 2008

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