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topic 10122

Iridite Process

We are to develop an Aluminum heat sink with Yellow / Clear Iridite coating. Please can you give me some detailed stats of this Iridite process so that I can develop it here. The parts are small - 4" X 4". Please let me have some details on this process.


Ravindra C Dani
- Bangalore, India


"Iridite" is a Macdermid brand name, so you certainly cannot formulate it yourself. But you are probably really referring to generic chromate conversion coating. You will find SOME details if you do a literature search back in the early 1950's when the process was developed; these days it's proprietary knowledge.

Ted Mooney, Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey


There is also a pretty good article on Chromate Conversion Coating in the Metal Finishing Guidebook at That would be a smart place to start, then finish by talking to a vendor of the materials.

Good luck!

lee gearhart
Lee Gearhart

Ed. note: The Metal Finishing Guidebook was available on-line for only a few months, but hard copies are readily available. Follow the link.


Refer to Mil-C-5541 [link by ed. to spec at TechStreet] Class 3.

Brian Kerluke
- Kelowna, British Columbia, Canada


I need to know if there is a way to coat an area that needs rework on aluminum parts if it needs to be re-machined, like a hole needs to be opened up.What can I do to coat the hole

Cecil veley
- Hannahan, South Carolina


A. Chromate conversion "pens" are available from most of the suppliers of chromate conversion chemistry, Cecil.

Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

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