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ted_yosem
Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
finishing.com -- The Home Page of the Finishing Industry

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Affect of water on 6061 anodized aluminum

probertEthumb Aluminum How-To
"Chromating - Anodizing - Hardcoating"

by Robert Probert

Also available in Spanish

You'll love this book. Finishing.com has sold almost a thousand copies without a single return request :-)


Q. I have a block that is type II anodized, class 2 with a blue dye. The block is prepped with a SS bead blast and degreased before anodize. The outcome is a rough textured surface.

61736-1

In the field, water runs through the block around 20 bar and up to 100 °C. The blue dye (and maybe the anodize) is coming off the block. Other blocks that were not bead blasted, have a smooth surface, and a different color dye and are not affected. What is happening with the anodize on the blue blocks? Is there a way to stop it? Why does it not happen to the other colored blocks?

Bill Zebo
- Minneapolis, Minnesota
September 19, 2024

Ed. note: This forum was built as a gathering place for sharing tips, pics, anecdotes, & opinions to promote camaraderie.
                When engagement is requested by strangers withholding their names, readers may be less likely to engage.

Eddy-current coating thickness tester
thickness_tester2
on eBay or

Amazon

(affil links)

A. Hi Bill.

If any stainless steel beads remain imbedded into the surface then all bets are off regarding proper anodize prep, anodize, and dye & seal. But it should be relatively easy to test the thickness of the anodizing and to do a seal test.

Use a hall-effect thickness tester at several places to determine anodize thickness, and search the site with "anodize seal test" for the various seal tests.

Luck & Regards,

ted_yosem
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey




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