[Healeys] Powder Coating Springs

[Charlie Frazer]

On May 14, 2013, at 12:32 PM, Ron Ray wrote:

It seems anyone that buys some sort of spray equipment, and builds an enclosed
space with some sort of heating capacity, can call themselves a powder-coater.
Finding a company that performs work in accordance with industry standards
might be a good idea.

Aluminum is powder-coated all the time with thermoset fluorpolymer powder.  It
is baked at 450 degree F oven temperature (410 degree F material temperature)
for approximately 12 minutes.  This process does not reduce the structural
capabilities of aluminum, a material with a much lower melting point than
steel.

The problem with heat-setting a finish onto some steel materials at 450
degrees F, is that some steel off-gasses: when heated.  This causes small
bubbles in the finish.  It is my understanding that this does not alter the
structural characteristics of steel.

  Ron


-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Chris Dimmock
Sent: Tuesday, May 14, 2013 3:38 AM
To: Charlie Frazer
Cc: healeys at autox.team.net
Subject: Re: [Healeys] Powder Coating Springs

Here is what a spring guy says....

"SO to answer the question, is it OK to powder coat springs? Well that
depends. In the amount of heat applied during the curing process. Too much
heat is harmful to springs. Once springs begin to get hotter than 350 degrees
Fahrenheit they begin to anneal, that is the steel starts to get soft, the
temper is lost and the spring will not support any weight.

In order to safely powder coat springs the temperature MUST remain below 350
degrees!!!!"

http://www.eatonsprings.com/powdercoating.htm




Sent from my iPhone

On 14/05/2013, at 5:23 PM, Charlie Frazer <cfrazer at jcomm.uoregon.edu> wrote:

> Kees,
> I respect your expertise.
> Could you tell me the specific evidence on which your caution about
> powder-coating  is based?
> What specific effects are there on springs and roll-bars heated at 400
> degrees?
> Thanks,
> Charlie
>
> On May 13, 2013, at 10:38 PM, Oudesluys wrote:
>
> These relatively low temperatures of 400 do effect some some types of
spring
> steel of springs, anti-roll bars etc. so beware. There are little
> effects
on
> other parts.
> Kees Oudesluijs
> NL
>
>
> Op 14-5-2013 6:11, Charlie Frazer schreef:
>> Thanks to a number of you who expressed your personal opinions on
>> whether
> to
>> paint or powder coat suspension springs, as well as discussing
>> various techniques for media blasting.
>>
>> My question is this:  Does the heat involved in powder coating really
> result
>> in taking the temper out of springs as suggested in some recent posts?
>> I'm not a metallurgist, but it appears to me that the temps in powder
> coating
>> are around 400 degrees, while springs are tempered at 900-950 degrees.
So,
>> does the relatively low temperature in the powder coating oven really
> affect
>> springs?  If so, how about A-arms and sway bars?
>>
>> Thanks for your comments.
>> ___
$12.75
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