Non Adhesive Coating on Aluminium

Teflon is used regularly on aluminum cookware. It should work on your roller too.

Teflon is a good idea. I was thinking of an anodic film.

It would help if we knew the purpose of this coating.

Not that I understand what the OP wants, but I think "non adhesive" coating might be interpreted as "non-stick". Anodizing does not satisfy this requirement.

"Anodizing increases corrosion resistance and wear resistance, and provides better adhesion for paint primers and glues than does bare metal."

But, since we can't read the OP's mind, we may never know.

There are a bazillion spray-on mold release agents that would also work, maybe, if we knew what the OP was really trying to accomplish.

A healthy coat of carnauba wax would work, too.

A bazillion? I had to look that one up! Hey, let me see the phone, would you?

Agreed, anodized is not a very likely solution, but we have nothing to go on. Like fishing; if no bites, change the bait.

I have at least a dodecillion potential answers but alas I too don't understand the questions.

My first answer would probably be axle grease. That is a real good "non adhesive coating" for swine. I would probably work real fine and it doesn't require any electricity like anodizing does. Especially nice if there isn't an outlet convenient.

Note- a dodecillion is a thousand decillion.

Good Luck, Old Salt

http://www.blinexindia.com/
Bioramani

I don't think there is a simple cheap answer here. But as long as the OP is vague about his application conditions it is going to be difficult to be of useful assistance.

Google search "ptfe impregnated anodize" One of the first links is:

http://www.finishing.com/1800-1999/1819.shtml

Read what it says with an objective mindset. Then read some of the other first page links.

I think that the frying pan coating has a lot of trade secrets behind it. And it might work for our OP except the surface finish for a roller that carries any significant load may be all wrong.

From my own experience with coatings on aluminum I'm inclined to think some experimenting with grit blasting the aluminum surface prior to class 3 anodizing may be in order.

Then work on some kind of plastic coating that will have the mechanical durability as well as reliability of adhesion. For light loads PTFE with a good mechanical attachment to the anodized surface may work OK. Beyond that you are getting into unknown territory. I'd look at very light mechanical finishing the PTFE coated surface to expose the hard anodized peaks of the aluminum to provide mechanical strength against roller loads.

Ed Weldon

I think we need to understand where you want to apply this characteristic.

I presume it is cookware of maybe not !

However as many have suggested Teflon is the most commonly used.

A Teflon coat can will be damaged if the dish is washed with a rough sponge , like scotch bite of similar.

For this reason many prefer Hard anodising.

There is an "somewhat" incorrect statement made by someone that anodising provides better adhesion for paint primers and glues than does bare metal."

Used as a base for painting or adhesion the anodising must be without sealing. When it is sealed it is has much less adhesion than bare material. Sealing is the process where the anodic pore is closed to make it resistant of atmospheric conditions. This is commonly used in architectural anodising.

What you require for cookware is Hard anodising. Hard anodising as compared to traditional anodising is much harder and thicker.

Architectural anodising will reach a maximum of 25 microns and 200 Vickers. The requirement for cookware is minimum 80 microns and 500 vickers.

The hard anodising is not effected by a rough spongue.

If this is not your application then we need to know exactly is it . Hard anodising is a very technical treatment of aluminium used widely in aircraft industry and high tech machinery.

Sputtering is probably a good solution depending on the application.

I have used plasma coating for both aluminum idlers and nip rolls with great success with some very aggressive adhesives. There are a variety of compounds available for both non-stick and traction properties.

If you will contact General Magnaplate they can offer you many options. I have been using them as a resource for over 30 years in the food industry and have found them more than capable of solving your problem as well as supplying you with prototypes and production costing.

Plasma coating is a generic term but also Plasma Coatings is the name of a company specializing in this process (www.plasmacoatings.com). I have used them on a number of occasions with very good success. Of course they are located in the US. However a search of "plasma coating" should direct you to a vendor of this service in your region.