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topic 615

Need Source of Iridite


(1996)

I am looking for a source of Iridite - a chemical used for finishing aluminum. A Canadian source is preferred, but any source would be appreciated.

Thanks,

Roelof Datema
Nortel
outdated


(1996)

This material used to be available through Witco Allied Kelite. However, Witco sold the metal finishing portion of their business to MacDermid. You might contact MacDermid to inquire if they still carry that product. Also, there are many other companies that manufacture similar conversion coating products (refer to QPL-81706 [link by ed. to spec at TechStreet]).

Blair Smith
aerospace - Windsor Locks, Connecticut


(2000)

Hi, I would like to know the difference between Iriditing & Anodizing (i.e when should one be used over the other, conductivity, material composition.....) Any data sheets or information will be greatly appreciated.

Thank You

Leo Minervini
- Saddle Brook, New Jersey


(2000)

Hello, Leo. Iridite is a proprietary brand name for process chemistry for Mil-C-5541 [link by ed. to spec at TechStreet] chromate conversion coating. Anodizing offers greater corrosion resistance than chromate conversion coating, but costs more because it is an electrolytic process, and a time consuming one, rather than a simple and quick immersion process.

Chromate conversion coated surfaces are fairly conductive, whereas anodized surfaces are insulators. Chromate conversion coating is clear or gold-ish, anodized finishes can be dyed many different colors. Good luck.

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


(2000)

I am looking for the thermal-optical properties of aluminum coated by Iridite, including literature references

Hans Peter Schmidt
aerospace center - Koeln, Germany


(2000)

Iridite is a brand name for Mil-C-5541 [link is to free spec at Defense Logistics Agency, dla.mil] chromate conversion coating chemistry. Chromate conversion coating preserves the conductivity of aluminum, whereas anodizing builds an electrically non-conductive aluminum oxide film. Chromate conversion coatings may or may not be subsequently painted. Anodized finishes can be painted, but rarely are. Anodizing offers greater corrosion resistance.

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


(2002)

I need a source for a Yellow Iridite touch up-Pen to touch up scratches in yellow Iridited aluminum.

Jon H [last name deleted for privacy by Editor]
- Lynchburg, Virginia
outdated


(2002)

I would like to know the difference between Iridite 14 and Alodine 1200. I know that these processes refer to the same MIL-C-5541 but it's not clear if they are equivalent or exactly the same thing.

Romani Romano
- Milano, Italy


Hello, Romani. Iridite is a MacDermid trade name for Mil-C-5541 [link is to free spec at Defense Logistics Agency, dla.mil] chromate conversion coating products and Alodine is a Henkel trade name for the same type of coatings.

Coke and Pepsi are both cola soft drinks but they are not exactly the same thing. Plus there is Diet Coke, Original Coke, New Coke, etc. It's the same thing with chromate conversion coatings: there are clear and yellow coatings, cyanide-free and cyanide-bearing chemistries, trivalent and hexavalent, dry-in place and rinseable coatings, etc. Plus there is one more distinguishing factor: some of them are accepted as qualified products for Mil-C-5541 [link is to free spec at Defense Logistics Agency, dla.mil] per QPL-81706 [link by ed. to spec at TechStreet] and some are not. Good luck.

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


April 22, 2010

How are the conductive properties of clear Iridite?

Don Wood
engineer - Brockton, Massachusetts, USA


April 22, 2010

Hi, Don. The coating is probably not actually conductive, but the clear chromates are exceptionally thin so as to not interfere with the conductivity of the aluminum. Iridite is a Macdermid trade name for a host of chromate conversion coatings, so the exacting fine detail would probably vary from one to another just as General Motors various Chevrolets have different properties. But the general answer is that Mil-DTL-5541 specifies the requirements for these chromate conversion processes.

Regards,

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



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