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topic 3258

Chemical Conversion Coatings on Al


1999

What are the differences/similarities between Alodine, Iridite, and Mil-C-5541 Chemical Conversion Coating.

DARIN G [last name deleted for privacy by Editor]
- PORT WASHINGTON, New York


Alodine (Henkel) and Iridite (Macdermid) are trade names of two of the approved materials for Mil-C-5541 [link is to free spec at Defense Logistics Agency, dla.mil] Chemical Conversion Coating of Aluminum, Darin.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


1999

If you are asking if there is a difference in the appearance of the different coatings, the answer is yes. I have used several types of conversion coatings and they each seem to have a slightly different hue. Although most applications are for a paint base we do have customers that use it as a final finish and have certain color requirements. I believe most do meet Mil-C-5541 but check with the manufacturer to be sure.

jim conner
Jim Conner
Anoplex - Dallas, Texas USA


1999

per Mil-C-5541 acceptable finish can range in color from light yellow to dark brown, though too brown can result in powdery finish.

Pete Silver
- Portland or



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