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Re: Powder Coating leaf springs
[Re: mridolfo]
#1095963
10/16/11 11:49 PM
10/16/11 11:49 PM
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Joined: Jan 2005
Posts: 4,404
Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,404
Michigan
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I can't speak to the question about the oven, but I would think the powder coating would crack and flake off with the flexing of the springs.
1987 Fifth Avenue - 512/518/D60
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Re: Powder Coating leaf springs
[Re: MarkZ]
#1095965
10/17/11 02:09 AM
10/17/11 02:09 AM
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Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
Scott Carl
pro stock
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pro stock
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
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Quote:
I can't speak to the question about the oven, but I would think the powder coating would crack and flake off with the flexing of the springs.
Powder coating should be fairly flexible. At least the product I'm familiar with is. However, if the ovens raised the spring temp above 400 degrees f, then temper of the springs could become an issue as many spring steels temper anywhere around 400. 350 and lower,it shouldn't be a problem. Any metallurgists, powdercoaters care to confirm or deny? 
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Re: Powder Coating leaf springs
[Re: mridolfo]
#1095966
10/17/11 08:04 AM
10/17/11 08:04 AM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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I was always taught the reason stressed items were not chrome plated was that the plating visually hid stress cracking. The same might be said for powder coating, but then who ever checks their leaf springs for telltale cracks?  I personally would not powder coat them 
Last edited by jcc; 10/17/11 08:10 AM.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Powder Coating leaf springs
[Re: POS Dakota]
#1095968
10/17/11 12:29 PM
10/17/11 12:29 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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The real reason you don't chrome plate suspension parts is because of HYDROGEN EMBRITTLEMENT. It works like this: when the part is being plated, hydrogen atoms migrate into the steel. There is enough space for a hydrogen atom to fit in the matrix. But the hydrogen atom isn't "happy" with being all alone and "wants" to join up with another hydrogen atom to make an H2 molecule. There isn't enough room in the matrix for that. Thus, the steel is internally stressed and can break with a brittle-appearing fracture at much lower stresses than the original steel part. To safely use chromed suspension parts the part has to be baked for several hours after plating to drive out the hydrogen atoms, even then you can't be sure. R. PS: To all those who know the correct ways to refer to the atoms, ions and molecules, I apologize as I can't remember after 35 years away from the classroom. 
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Re: Powder Coating leaf springs
[Re: dogdays]
#1095974
10/18/11 05:55 PM
10/18/11 05:55 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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Quote:
The real reason you don't chrome plate suspension parts is because of HYDROGEN EMBRITTLEMENT. It works like this: when the part is being plated, hydrogen atoms migrate into the steel. There is enough space for a hydrogen atom to fit in the matrix. But the hydrogen atom isn't "happy" with being all alone and "wants" to join up with another hydrogen atom to make an H2 molecule. There isn't enough room in the matrix for that. Thus, the steel is internally stressed and can break with a brittle-appearing fracture at much lower stresses than the original steel part. To safely use chromed suspension parts the part has to be baked for several hours after plating to drive out the hydrogen atoms, even then you can't be sure.
R.
PS: To all those who know the correct ways to refer to the atoms, ions and molecules, I apologize as I can't remember after 35 years away from the classroom.
Good reply, however that applies to most plating and should make many scratch their heads regarding using yellow zinc plated grade 8 bolts, etc. My plater says they after bake my grade 8, stressed stuff, but how does one really know? 
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Powder Coating leaf springs
[Re: jcc]
#1095975
10/18/11 07:17 PM
10/18/11 07:17 PM
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Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
Rug_Trucker
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
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I thought sand blasting is not good for springs, or torsion bars?
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: Powder Coating leaf springs
[Re: dogdays]
#1095977
10/19/11 02:44 PM
10/19/11 02:44 PM
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Joined: Jan 2007
Posts: 2,212
Minnesota
peabodyracing
top fuel
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top fuel
Joined: Jan 2007
Posts: 2,212
Minnesota
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We blast and powder coat coil springs, leaf springs and torsion bars all the time here. We've done them for cars, 4 wheelers, motorcycles, trailers, mudders, etc. (JIT Powder Coating, Farmington, MN) In 10 years of catering to the hobbiest I've yet to have any come back for paint failure.
We use a crushed glass/plastic media combo for blasting which works very well for maintaining a good surface appearance. The cure cycle on most typical blacks like we put on springs is 18-20 minutes at 340-360 degrees F. This is the desired surface temp of the painted part, not the cure oven temp set point. This isn't enough temp or dwell time to affect the spring.
If you've ever visited a spring shop and seen how they're made I don't think you'd be concerned about cure oven temps.
As previously mentioned there is no similarity at all between chrome plating and powder coating.
Lead, follow or get the hell out of the way
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