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Letter 40620
Test to check clear Iridite coating
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Is there a method to test if aluminum parts have been coated with
clear Iridite?
Chem. or electronically
Joseph J. Maschin
- Fort Lauderdale, FL, USA
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Just trust the word of your plater.......kidding with you...
I dont think anyone has come up with any test for this clear iridite
verification.
How about conductivity test which is required in clear iridite. But
again this test itself does not tell you much from yellow to clear
iridite. I am only talking about my experience.
Thanks

Hemant Kumar
- Florida, USA
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Iridite is a trade name for generic chromate csonversion coating
for aluminum. Spot test kits are available from the supplier of the
product. Also, non-proprietary formulations are available for
detecting the prescece of the chromate coatings.
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"Clear" chromate coating is a myth. If there in NO color, there is
NO coating. The color may be faint, but if there is a chronmate
coating, there will be color.
"Clear" chromate is as real as the Emporers new clothes.
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Jeffrey Holmes,
CEF
- Spartanburg, SC, USA
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Mil-C-5541 [link is to spec at TechStreet]Class 3
"clear" (but it does not have to be to meet the spec) to the naked
eye will increase salt spray, indeed, is frequently required to pass
168 hours salt spray. It is not a myth. It can be unseen by the naked
eye and you have to submit a drop test to prove that it is there.
Dear Reader, please --
- Answer or follow-up on this subject (in non-commercial
fashion).
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- My company is a supporting advertiser at
finishing.com and we want the contact information to reach
the inquirer privately.
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- Post a new
question or inquiry on a different subject.
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