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Date: 16 Jul 2007 11:45:49
From: zencycle
Subject: powder coating aluminum frames
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I was recently asked a question - do the high temperatures in the
powder coating process adversely affect the characteristics of the
alloys used in aluminum frames?
I seem to remember seeing powder coated Al frames on the market,
though I can't recall any specific examples. It seems to me that you
would need much higher temperatures than typical powder coating
(400degF) to cause any damage to the tubes, but there are MFRs of
engine parts that recommend against powder coating the alloys used in
their products.
Any ideas?
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Date: 19 Jul 2007 23:08:28
From: Booker C. Bense
Subject: Re: powder coating aluminum frames
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In article <1184611549.191541.215790@o61g2000hsh.googlegroups.com >,
zencycle <zencycle@bikerider.com > wrote:
>I was recently asked a question - do the high temperatures in the
>powder coating process adversely affect the characteristics of the
>alloys used in aluminum frames?
>
>I seem to remember seeing powder coated Al frames on the market,
>though I can't recall any specific examples. It seems to me that you
>would need much higher temperatures than typical powder coating
>(400degF) to cause any damage to the tubes, but there are MFRs of
>engine parts that recommend against powder coating the alloys used in
>their products.
>
>Any ideas?
>
Velocity sells a lot of powder coated Aluminum alloy rims.
_ Booker C. Bense
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Date: 16 Jul 2007 15:39:51
From: almost_fast@yahoo.com
Subject: Re: powder coating aluminum frames
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On Jul 16, 1:45 pm, zencycle <zency...@bikerider.com > wrote:
> I was recently asked a question - do the high temperatures in the
> powder coating process adversely affect the characteristics of the
> alloys used in aluminum frames?
Possibly. Some aluminum extrusions I worked with showed unacceptable
degradation of alignment after going through powder coating. We
checked with a CMM before and after, a batch of 50 parts.
> I seem to remember seeing powder coated Al frames on the market,
> though I can't recall any specific examples. It seems to me that you
> would need much higher temperatures than typical powder coating
> (400degF) to cause any damage to the tubes, but there are MFRs of
> engine parts that recommend against powder coating the alloys used in
> their products.
>
> Any ideas?
We turned down the temperature and tolerated the distortion. I always
worried about the structural properties, but the parts passed fatigue
testing. That's not the same as saying they were "as good as" the
anodized version, though...
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Date: 18 Jul 2007 12:48:49
From: Rocky
Subject: Re: powder coating aluminum frames
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were those extrusions heat treated before?
I thought that heat treating of a typical aluminum alloy used in a bike
frame was done at something like 1600 F.
<almost_fast@yahoo.com > wrote in message
news:1184625591.043666.181500@g4g2000hsf.googlegroups.com...
> On Jul 16, 1:45 pm, zencycle <zency...@bikerider.com> wrote:
>> I was recently asked a question - do the high temperatures in the
>> powder coating process adversely affect the characteristics of the
>> alloys used in aluminum frames?
>
> Possibly. Some aluminum extrusions I worked with showed unacceptable
> degradation of alignment after going through powder coating. We
> checked with a CMM before and after, a batch of 50 parts.
>
>> I seem to remember seeing powder coated Al frames on the market,
>> though I can't recall any specific examples. It seems to me that you
>> would need much higher temperatures than typical powder coating
>> (400degF) to cause any damage to the tubes, but there are MFRs of
>> engine parts that recommend against powder coating the alloys used in
>> their products.
>>
>> Any ideas?
>
> We turned down the temperature and tolerated the distortion. I always
> worried about the structural properties, but the parts passed fatigue
> testing. That's not the same as saying they were "as good as" the
> anodized version, though...
>
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