Hello Richard,
This subject comes up about once a year with various CM's and military packaging accounts.
99.9% of the time the problem is with the supplier.
Please reference the following quote.

"Sealing of Anodic Coatings"

"To achieve the maximum protective qualities and corrosion resistance
required for finished articles, the anodic oxide must be sealed after it is
formed and/or colored. The sealing process consists of immersing the
anodized parts in a solution of boiling water or other solution such as
nickel acetate, wherein the aluminum oxide is hydrated. The hydrated form of
the oxide has greater volume than the unhydrated form and thus the pores of
the coating are filled or plugged and the coating becomes resistant to
further staining and corrosion. The use of nickel containing seals will in
most cases prevent leaching of dyes during the sealing operation."

"Metal Finishing '99 Guidebook and Directory," 67th Guidebook and Directory
Issue, Metal Finishing Magazine, Tarrytown, NY, 1999, p.491.

If you have a quantity of these parts available and need to keep production going, you can try a boiling water treatment of the heat sink parts. Typically 20 -30 minutes of immersion will be sufficient.

Any further questions, please do not hesitate to call me.
Best regards

Charlie Pitarys
Director of Application Technologies
603.622.2900 X-115
www.kyzen.com

-----Original Message-----
From: Richard Carruth [mailto:[log in to unmask]]
Sent: Friday, February 15, 2002 3:48 PM
To: [log in to unmask]
Subject: [TN] Anodize part washing

Hello all, I have a question regarding Type II Class II black anodize of
extruded aluminum. I have some extruded aluminum heatsinks that look really good
(dark black and uniform) coming into receiving inspection, however they become
very splotchy and blue colored after they are washed in our MCS100 cleaner with
Kyzen. Does anyone have any information they can share with me regarding this
issue. Our customer will absolutely not accept any non-uniform black anodize.

Richar Carruth
Quality Engineer
LaBarge Inc.
PH# 918-459-2346
[log in to unmask]

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