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Hi Ashok! Just an fyi but chromate conversion coated aluminum surfaces
(e.g. such as heatsinks on pwbs) which are subjected to water temperatures
150F or greater and under a typical spray pressure (e.g. a water wash
system) will have the conversion coating removed by the process. The black
appearance you have observed may be a now "bare" aluminum surface reacting
to the pH of your saponified solution.
Dave Hillman
Rockwell Collins
[log in to unmask]
"Dhawan, Ashok"
<AshokDhawan@SOLE To: [log in to unmask]
CTRON.COM> cc:
Sent by: TechNet Subject: [TN] Tarnished Surface
<[log in to unmask]>
12/17/2003 03:12
PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to
"Dhawan, Ashok"
Technetters
Anyone who has experienced and resolved tarnishing of Aluminium surface
upon
cleaning with DI water + saponifier. The aluminium surface is protected
with
conversion coating (clear) which is turning black when exposed to
saponifier
solution.
Ashok Dhawan P.Eng
Manufacturing Engineer
Solectron
Snailmail:1455 Mountain Avenue
Winnipeg MB R2X 2Y9 CANADA
* E-mail: [log in to unmask]
* Phone: (204) 631-7208
* Fax: (204) 631-7294
* I-net: <http://www.solectron.com>
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