Hardcoat Anodize 7075 Aluminum on Ampco 45
Hardcoat Anodize 7075 Aluminum on Ampco 45
(OP)
Has anyone tried this?
Any negative effect of using this combination?
Any negative effect of using this combination?
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Hardcoat Anodize 7075 Aluminum on Ampco 45
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RE: Hardcoat Anodize 7075 Aluminum on Ampco 45
What is the application/exposure?
Generally, copper is one of the worst accelerators of corrosion of aluminum. Even rainwater running off Cu roofing corrodes Al. But, Aluminum Nickel Bronze, Alloy C630 is the 'least bad' of the Cu alloys. However, 7075 is about the 2nd most corrosion-prone of the common wrought Al alloys (after 2024). The hard anodizing of the 7075 will delay the inevitable, but I wouldn't recommend the given combo for a longterm outdoor application.
RE: Hardcoat Anodize 7075 Aluminum on Ampco 45
Don't think about salt water.
If you could comeback with what media the combination will see I think you will get a more specific answer.
RE: Hardcoat Anodize 7075 Aluminum on Ampco 45
thanks for everyones responses
RE: Hardcoat Anodize 7075 Aluminum on Ampco 45
It has to be lubricated and the PV keep a low as possible.
Aluminum at high speeds is goverened by the oil film.
I’ll try to find my information on aluminum bearings and get back. I don’t remember ever remember encountering an aluminum bearing with the bearing surface anodized.
Hardcoat anodizing can be very abrasive so watch you joint carefully.
RE: Hardcoat Anodize 7075 Aluminum on Ampco 45
It would be teflon impregnanted hardcoat.
thanks again!
RE: Hardcoat Anodize 7075 Aluminum on Ampco 45
“Teflon®-impregnated hard anodize” is basically a myth. The pores are too small even for the submicron particles used, and there is a surface charge problem. Ergo, MIL-A-63576A ALUMINUM OXIDE COATING, LUBRICATIVE, FOR ALUMINUM AND ALUMINUM ALLOYS was canceled without replacement in 1998.
For those anodizers who claim to co-deposit Teflon® during the anodizing process, this is basically not true, either. See
A. D. Dinsmore et al., Nature, vol. 383, p. 239 (1996), or
J. M. Runge and A. Pomis, Plating & Surface Finishing, p. 60-64 (June 2003).
The latter paper describes experimental work in which an unspecified ‘electroactive polymer’ was co-deposited with hard anodize. This process has not yet been commercialized to my knowledge.
Alternatives: liquid or dry-film lubricants such as baked-on Teflon® can be used on unsealed hard anodize. Or, electroless nickel containing co-deposits such as Teflon® particles can be plated on aluminum.