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NAS 4006 coating of aluminum onto other metals
Q. I've got a spec for NAS 4006...plating aluminum onto other metals...any info on how that's done?
Rich Kellettaerospace - Simsbury, Connecticut
November 19, 2009
A. Hi, Rich. I believe it calls for special aluminum paints on fasteners, but whether Ivadizing or electroplating with aluminum also comply with the spec, I don't know because -- sorry -- I don't have a copy of that spec.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
November 20, 2009
A. Rich, I took a quick look at NAS 4006, and it would allow IVD or AlumiPlate (or thermal spray, or dip immersion, or . . . you get the picture.) It does say that the thickness anywhere a inch diameter ball can touch must be between .0002 and .0005 inches thick, but it allows coating by "any suitable technique capable of producing a coating meeting the requirements of this specification." Those requirements include appearance, adhesion, fluid resistance, paint stripper resistance, corrosion resistance, lack of embrittlement, and heat resistance.
Lee Gearhart
metallurgist - E. Aurora, New York
A. I am only aware of polymeric coatings that meet the performance requirements of this specification.
Frank RawolleAerospace - Chula Vista, California, USA
July 12, 2010
Q. Can this be applied to Copper parts???
Enrique Rojas- Corona, California
May 16, 2012
A. Hi Enrique
Some of the technologies mentioned, including electroplating and polymers, should be fine for copper parts.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
May 22, 2012
Q. I have a lot of parts (200 pieces) to be sent out to be Aluminum Coated per The NAS 4006. I found out that this spec is good, but no one in The Great LA county is approved to apply it.
Is there any alternative or can the BMS 10-85, be used instead?
Material type: Inconel 718./ per AMS5962/ Cold reduced material.
Please help me out. Parts will be used on a Bombardier aircraft.
- Los Angeles, California
November 5, 2012
A. Jamie,
You must talk to your customer before making any change to the product, you cannot just solicit responses from anonymous sources on a website, I'm sure Bombardier will frown at the practice!!
Your customer will have an Approved Source List in some format or another that will tell you where you can go to get the coating done. It may not necessarily be in California; Aerospace companies tend to have quite small Approved Source Lists as maintenance of an approval is expensive.
Whatever you do make sure you have your customer approval BEFORE you do anything.
Aerospace - Yeovil, Somerset, UK
November 8, 2012
Is anodizing a satisfactory finish to meet NAS4006?
Q. So, per NAS4006, it says any suitable application that has that coating thickness ... will anodizing work? Aluminum anodizing falls within that range and there are specific specs for anodizing, but according to NAS4006 the material must not reach a temperature above 200 °F.
Andres Pelayo- LA, California, USA
January 6, 2015
A. I'm not clear on your question, Andres. Yes, anodizing can easily be done to where the parts do not reach 200 °F during the coating process. However, I can't help but wonder if the spec you're referring to (sorry, I'm not familiar with it) is saying that anodizing is not an appropriate coating for parts that reach 200° while in use in the field. That would make sense. At higher temperatures the anodizing (Al2O3) will tend to crack and craze as the substrate will move and expand and the coating will not, due to differing thermal expansion rates.
Marc Green
anodizer - Boise, Idaho
January 9, 2015
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