Powder coating a C2 cooling fan

[Gary B.]

Re: Powder coating a C2 cooling fan

Google e-coat for full description. Our was a 14 stage process for cleaning, pretreatment, painting, triple rinsing in a deionized water bath , and then passing through an overhead oven at 360 degrees for 30 minutes. The end product is an epoxy primer that is used under wet spray or powder coating to enhance endurance. E-coat is accomplish in a water / paint bath. Anywhere the water can reach, no air bubble areas, you will get the surface primed.
Powder coating is spraying charged powder particles from a fluidized bed onto the part that has the opposite charge. Due to Faraday cage effect, the powder does not want to reach inside corners and pockets. The powder will travel to the adjacent sides of the corner and tend to be light or no coat at the actual corner where metals meet. Hence, priming with e-coat and them powder coating is far superior. This is evident if you observe an aged John Deere tractor with e-coat under their powder vs lower priced tractors with pretreatment and powder coating or wet spray only.

GM like and other manufacturer has volumes of specs for their painted parts and all suppliers have to qualify their process and the cost could easily run into thousands of dollars.

Previous question you asked: wet spay paining thickness probably ranges between 3-6 mils.

Terry,

Thanks for the education!

Gary