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Metallurgy/Does powder coating aluminum wheels degrade the aluminium



Will aluminum wheels loose any strength if subjected to the powder coating process?  We normally heat up the wheel to 420 degrees F for 10-15 minutes, pull out of the oven and coat hot. We then put back in the oven at 400 deg. F to bake for 10-15 minutes. Our concern is that we weaken or stress the aluminum during this process to the point that it is unsafe to use?  Also, is all aluminum automotive wheels made of the same or similar alloy and does size, 18-22 inch wheel matter for this process?  We are a custom coating job shop and have no control of what is brought to us.  Our customers just want it coated a certain color.  We would like to be able to help them, but not if it puts their safety at risk.

Thank you very much,


ANSWER: Dear Scott,
Please tell me the grade of aluminum alloy to answer your quarry.

---------- FOLLOW-UP ----------


Here lies part of the problem, I don't know.  We get people that bring in stock wheels and aftermarket wheels from all different manufacturers.  I was hoping you you could tell me what alloy automotive "Aluminum" wheels are made from? Is there a mark we could look for that would identify the alloy?  Is there some inexpensive way of determining the type of aluminum they are made of?

I am sorry for being so vague in my response.  I know about the coating process that we do to the wheels, but not much about the wheels themselves.

Thanks for your help,


Dear Scott,
No, never.Powder coating increase the life of wheel,why?
1) Coating material acts as a barrier on against corrosive environment(salt/alkali/acidic water/mud when automobile is on road)
2) Any corrosive material will first attack coating not aluminum of wheel.
3)It increases the life of wheel more than double provided you donot damage wheel by mechanical damages/accidents etc
Go Green! with coatiing.


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Questions that i can answer:- 1-sand casting of cast iron,S.G. iron,steel and aluminium alloys 2-Gravity die casting of aluminium 3-Low pressure die casting of aluminium 4-High pressure die casting of aluminium 5-Failure analysis of ferrous and non-ferrous castings Questions that i can`t answer:- 1-testing of iron and steel 2-Problem related to welding 3-Problems related to corrosion 4-Amorphous metals,rubbers,nylon,plastics and plastic moulding


1-Sand casting and ferrous and non-ferrous alloys 2-Gravity die casting,low pressure die casting,high pressure die casting of aluminium alloys.With a specialisation in auto-mobile components castings. 3-Alloy steel making on arc furnace,AOD,VOD,Con-cast root of alloy steel making. I have been working as Foundry man since last 27 years.

Hindustan motors Ltd.

I am a Metallurgical Engineer graduated from National institute of Technology,warangal(India) in 1984 and in 1991 i completed my masters degree in business administration(M.B.A.) from Institute of Management Technology,Ghaziabad(India).

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