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Blue anodize appearance for different material

Q. Our customer ask to keep exactly the same appearance after 7075T6 and 6061T6 blue anodized. Is that reasonable ?

Gene Ho
- Tai-chung , Taiwan
2006

A. As long as he maintains the same chemical analysis for 7075 as 6061 :-)

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
(Ted is available for instant or longterm help)

2006

At lower thicknesses the 6061 and 7075 come out very close to the same color, however, as thickness increases the 6061 tends towards tan-black, and the 7075 tends towards blue-gray. This is because of the different alloying ingredients. You may override this tendency with higher free acid, perhaps 200 gm/L, higher temperature up to about 75 F, and lower current density, all three parameters make a larger pore and would adsorb more blue dye and bring the two alloys closer together.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2006

Thanks for the help everyone!

Gene Ho
- Tai-chung, Taiwan
2006

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