how to keep powdercoat from peeling?

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Subject Author Date
how to keep powdercoat from peeling? Eric Anderson 04-24-2008
Posted by Eric Anderson on April 24, 2008, 12:16 am
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 I have a sensor housing that is used for winter plow trucks. I have
my fabricator of the housing powder coat it. It seems to have good
integrity, but some tests I have been doing with thermo-shock from
about 0 degrees F to 170 degrees F have shown some flaking problems.
The material is flaking in sheets, like the metal may not have been
prepared properly.

Can someone give me a quick prep course so that I can talk
intelligently to the powder coat supplyer? What prep questions
should
I ask? Are there different types of powder coat that may be better
for the harsh environments seen by a winter plow truck?


rec.crafts.metalworking

Posted by Steve Lusardi on April 24, 2008, 1:25 am
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 It is called clean, clean and very clean. The surface must be degreased
thoroughly and sand blasted to a oo finish. For longevity there should be no
sharp edges. Every edge should be radiused.
Steve

>I have a sensor housing that is used for winter plow trucks. I have
> my fabricator of the housing powder coat it. It seems to have good
> integrity, but some tests I have been doing with thermo-shock from
> about 0 degrees F to 170 degrees F have shown some flaking problems.
> The material is flaking in sheets, like the metal may not have been
> prepared properly.
>
> Can someone give me a quick prep course so that I can talk
> intelligently to the powder coat supplyer? What prep questions
> should
> I ask? Are there different types of powder coat that may be better
> for the harsh environments seen by a winter plow truck?
>
>
> rec.crafts.metalworking



Posted by Steve W. on April 24, 2008, 8:53 am
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Eric Anderson wrote:
> I have a sensor housing that is used for winter plow trucks. I have
> my fabricator of the housing powder coat it. It seems to have good
> integrity, but some tests I have been doing with thermo-shock from
> about 0 degrees F to 170 degrees F have shown some flaking problems.
> The material is flaking in sheets, like the metal may not have been
> prepared properly.
>
> Can someone give me a quick prep course so that I can talk
> intelligently to the powder coat supplyer? What prep questions
> should
> I ask? Are there different types of powder coat that may be better
> for the harsh environments seen by a winter plow truck?
>
>

I'll assume this is a steel housing?
In that case you want the steel fabricated. Degrease it with a good
solvent. Then for prep you can sandblast it with 100 grit. Once blasted
a run through a chromate bath and then coating with a polyester blended
powder should do the job.

Powders come in a LOT of formulations. They are not a one size fit's all
solution. The proper powder on a properly prepped substrate should last
at least 5 years with NO degradation of finish quality. Explain what the
problem is and they will likely change the formulation.

We did that a lot at the powder plant I worked at.

--
Steve W.

Posted by RoyJ on April 24, 2008, 9:18 am
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All the major snowmobile mfg's use an e-cote dip for corrosion
resistance and UV stabilized powder coat over the top for impact
resistance. The e-cote has the advantage of a slight roughness that
gives 'bite' for the powder coat.

Eric Anderson wrote:
> I have a sensor housing that is used for winter plow trucks. I have
> my fabricator of the housing powder coat it. It seems to have good
> integrity, but some tests I have been doing with thermo-shock from
> about 0 degrees F to 170 degrees F have shown some flaking problems.
> The material is flaking in sheets, like the metal may not have been
> prepared properly.
>
> Can someone give me a quick prep course so that I can talk
> intelligently to the powder coat supplyer? What prep questions
> should
> I ask? Are there different types of powder coat that may be better
> for the harsh environments seen by a winter plow truck?
>
>
> rec.crafts.metalworking

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