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topic 896

Need black anodizing that is UV-proof


We are looking for a method for black anodizing which is UV-proof for optical use. Furthermore we would like to know if there is a method to direct black anodize without use of organic dye. Thank you for Your answers.

- Netherlands


We are evaluating a new type of anodizing/hardcoating process. It utilizes high voltages in a non-acid electrolyte. Its properties are similar to sulfuric acid anodizing without the loss of fatigue strength. However, it is possible to develop integral colors, such as black. Preliminary testing indicates excellent optical characteristics.

Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
supporting advertiser
Wadsworth, Ohio

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We currently use a two step black electrolytic color anodizing, first sulfuric acid anodizing and then AC electrolytic coloring which basically is stannous sulfate. I know by experience the color won't fade against UV if it was processed within certain limits.

Saludos desde Mexico

Guillermo Luna
- Mexico City, Mexico

February 1, 2008

I'm really interested in this topic, and I would like to do a couple of runs using the electro coloring process, the only thing I'm not sure about is what concentration do you use, is this a non acid bath? and how much AC current is needed I for how long

Alejandro Arriaza
- Guatemala City, Guatemala

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