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Old 11-08-2013, 03:40 PM   #1
Grizzligris
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Focus 2012 silver mag paint reacts to metal hub

Hi,

I just changed my wheels from standard mag season tires to oem winter tires and dealt with severe problem of 4 mag wheel being completely mated and kind of glued to the metal drum.

The paint left a gray ring on the drum once unstocked. I had to loosen all bolts and drive around to make them free.

This is ridiculous that the paint is chemically reacting to the metal.
Usually metal and aluminum don't go together, but there is a paint coating which should isolate them. The paint is covering all the internal surface there so it's not the case of aluminum and steel.

Have you seen that before ?
Anyone aware if Ford is aware of this issue ?

Thanks,



Last edited by Grizzligris; 11-08-2013 at 04:10 PM. Reason: Term hub replaced by drum
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Old 11-08-2013, 03:45 PM   #2
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What on earth are you talking about?

What do you mean by "mag" because I assure you, no Focus leaves the factory with magnesium wheels...

Do you have any pictures to clarify?
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Old 11-08-2013, 04:08 PM   #3
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"Mag" is an old expression here for alloy rim.

By hub i meant drum.

So the standard alloy rim with the focus, which are painted gray, got completely mated to the wheel hub. After i finally got it out, you could see a gray ring where the rim touches the hub, a deposit of gray paint, which made it completely stuck.
I don't have a photo, but here is a drawing of where it got stuck in the red area.
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Old 11-08-2013, 04:35 PM   #4
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And it's paint?

As far as I'm aware, Ford does not paint the inside of the wheel where it mounts to the hub.

Pictures would definitely be a plus... Even just a photo of the mounting face of the wheels you removed would be insightful here...
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Old 11-08-2013, 05:44 PM   #5
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Thank you for your reply.

I should have taken a picture, but the wheels are back on.

Think of the drum full of rust like usual and a gray-white ring around the drum like indicated.
After removing all 5 lugs, the wheel was totally still stuck to the drum and you could not see a gap at all between both parts, the gap being filled with that gray-white residue.
Kicking the wheel and really pulling did nothing. I had to use the weight of the car to make them come off.

If the inside of the wheel are not painted, then it makes sense that the alloy would react with the steel of the drum

Although I have never seen that on other wheels on my previous car throughout a 4 year period.

That makes me think the composition of the alloy might be such that it reacted to the steel. That is just a theory.
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Old 11-08-2013, 06:17 PM   #6
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Could it be some kind of corrosion? You guys (eastern Canada) are pretty aggressive with salt and the like in winter.
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Old 11-08-2013, 11:06 PM   #7
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Galvanic Corrosion.


Use a thin coat of grease ... wheel bearing, dielectric, Amsoil Metal Protector, Anti-Seize, etc. The thin film slows the reaction.
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Old 11-10-2013, 01:53 AM   #8
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Quote:
Originally Posted by iminhell View Post
Galvanic Corrosion.


Use a thin coat of grease ... wheel bearing, dielectric, Amsoil Metal Protector, Anti-Seize, etc. The thin film slows the reaction.
I was going to say the same thing
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