Would High temp. powdercoat work in this situation ....

[Guest]

Hi All, I am re-engineering a set of rotors from a brake kit. The original rotor hats were anodized aluminum. What happened was the anodizing wore off and bare aluminum contacted bare cast iron. That, plus the salted roads in the winter caused galvanic corrosion of the aluminum, which led to these nasty looking cracks!!

I plan to machine new aluminum hats (using 7075 t7351) and to improve corrosion resistance, I was thinking to anodize the hats, THEN add high temperature powdercoat to it. What do you think of this? The hat does see lots of cycles of heating/cooling, but it doesn't see THAT much heat compared to the cast iron rotors.

What do you guys think? Will the powdercoating stand up in this application?

looking at the picture, i am going to machine a new "hat" which is the black center piece.

[wiseguyz]

Re: Would High temp. powdercoat work in this situation ....

Is this a special rotor that you can't buy any more? If not, why go to all that trouble? I'd buy a new set, blast, coat with regular powder (which should hold up fine according to a few guys on here who do them regularly) and be done with them. Good luck either way. And to answer your question, high temp would probably work, but I don't think it would be as durable as a regular powder. To help with the corrosion, use a good powder primer before your final finish coat.

Best of luck.

[DxC]

Re: Would High temp. powdercoat work in this situation ....

so you wouldnt use high temperature? does high temperature have less durability than normal powder? can normal powder take the temps of braking?

also im guessing i should use the zinc primer?

please recommend specific products. i see the zn primer, but im still thinking high temp powder would be best to deal with the heat. im also hoping the powdercoat is flexible enough to expand and contract with the metal

[Guest]

Re: Would High temp. powdercoat work in this situation ....

Correct the high temp is not very durable. Your reg powders will be the best for durabability they withstand pretty good temp.I think up to 250 F (dont qoute me on that).

I few guys use the zinc primer i never have, it's up to you and how u want it to turn out.

IF you use high temp just be careful when re installing and be warned that road debri will remove it easily.
I say just blast, prep and spray some Low gloss black.