Problem with high temp flat black!!

[deluxepowdercoating]

I dont know what im doing wrong but I am having major issues with this high temp flat black chipping. The midpipes are brand new made of steel, I blast them with black beauty media, clean them and give them a phospate coat, dry them and coat them. I bake them at 450 for 20 pmt. after the part was cooled I was blowing one off with air and the stuff just chipped right off. Dont know what to do with this powder. Do you think muffler black is better to use? What do you think could be my problem?

[Guest]

Re: Problem with high temp flat black!!

i think the problem may be with the phsophate as i have found the hard way is if there is anything between the base metal and the high temp powder it will not stick properly. you can try what i do when doing exhaust work, after blasting the part i wash it down with breake cleaner( aerosol ) till it the run off is clear place it in the oven for 45 mins at 450 deg. take it out let cool glass bead blast and repet after the time is up i go stright from the oven too the spray booth and coat the part. i have used this system for over two years now and it never let's me down. give it a try i think you will like what you see.

i'm not a chemist but i think the problem with the powder sticking properly has to do with the high silicon content of the powder.

good luck,

gator

[Auto-Cycle PC]

Re: Problem with high temp flat black!!

I have had problems with the hi temp powders too after talking with Powderbuy yesterday i am going to give them another shot he said the ideal mill thickness for them is 1.8 mills and I know for a fact I was applying them much heavier and having the same issues as you. Gator gave some great advice too I have much better results with the ceramics if I run them through a full bake cycle and reblast and I dont think you are suppose to use phosphate as a pretreatment for the high temp applications. Another tip is to coat the exhaust as soon as you blast it do not let it sit because the oxidation starts immediately and will cause adhesion issues. Never try to recoat the hi temp powders because they are silicone based and will not stick (crosslink) to each other.

[deluxepowdercoating]

Re: Problem with high temp flat black!!

Awesome! Thanks for the input, I am going to try it this way for sure. I usually used denatured alcohol as my cleaner when I clean this way. Does anyone have any idea about that? It does not leave any residue and I dont have problems with it (that I know off). Also thanks for reminding me that this is a silocon product, I totally forgot, i guess im not the sharpest tool in the shop!

[Guest]

Re: Problem with high temp flat black!!

Hmm all i did was blast with AO clean with PRE. cured and put on my bike. havent had a problem yet.headers are Stainless Steel. I will say be careful when putting them back on the High temp scratches very easy.
Good luck with the next try

[Guest]

Re: Problem with high temp flat black!!

Oh great you guys post this now! I have a set of shorty straight pipes and a full set of vance and hines pipes mufflers heat shields and hardware cooling down right now. I already told the guy no warrenties because both sets were used and chrome plated.

[Guest]

Re: Problem with high temp flat black!!

Well everything turned out great. Powder covered real well. I took one of the smaller brackets and gave it a pretty good shot with the end of a screw driver and no chipping did leave a little mark but nonthing major. As long as they hold up to the heat I will be a happy camper.

Speaking of cleaning guns after high temp how do you guys do it. Im only using the EW Hobby gun that has been pretty beat up so I took the whole gun apart and gave it a real good washing and letting dry overnight.

[Guest]

Re: Problem with high temp flat black!!

Zinc or Iron phosphate breaks down or burns off at temperatures ranging from 600F-750F. When you have a part that is powder coated with zinc or iron phosphate underneath, as soon as it reaches those temperatures the phosphate will delaminate from the substrate and pulls the powder with it. If you’re not getting to those temperatures but getting close, your coating will lose its impact resistance, adhesion, and will become more brittle. This is why some parts take a little longer to flake or chip off when a phosphate is applied underneath a high temp coating.