What is iridite
What is iridite
(OP)
I have a new customer that requires aluminum alloy 2024 to have an iridite process. What exactly is iridite? I have heard several ideas, which is why I am asking. I want to be sure to completely understand their requirements and expectations.
Thanks for any help you can provide.
Thanks for any help you can provide.





RE: What is iridite
http://www.engineersedge.com/iridite.htm
Note that despite what it says about conductivity, REALLY low resistance contacts requires removal of the iridite.
TTFN
RE: What is iridite
For more information, MIL-C-5541E, MIL-DTL-81706B and the Qualified Products List QPL-81706 are free downloads at ASSIST Quick Search: http://assist.daps.dla.mil/quicksearch/
See also ASTM B449-93(2004), "Standard Specification for Chromates on Aluminum." http://
What is the end use of the 2024 parts?
It's increasingly common to get requests for Non-Hexavalent chromium coatings. A new QPL including non-hex. Cr coatings is several months overdue. However, there is ASTM B921-02 "Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys." http://
Re IRstuff's comment on resistance. True, but bare aluminum is rapidly oxidized by oxygen and water vapor in the air, so after a while the electrical resistance of mechanical connections increases (unless precautions are taken, such as sealing with EJC). Ohmic heating and fires may result. For many military and aircraft surfaces, MIL-C-5541E Class 3 coatings are required to prevent long-term increase of electrical connection resistance. Of course, for really low resistance long-term, plate with tin or Ni+Au.
RE: What is iridite
TTFN