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topic 8490

Auto Wheel Chrome Peeling


We are having sporadic problems with the chrome peeling off of aluminum auto wheels. I have been told that the brake dust from the disk brake pads can cause it if the dust is allowed to stay on the wheel for an extended period of time. Does this sound correct?

Trey Chanter
- Portland, Oregon, USA


It is true that the cleaner a surface is kept the less prone it is to corrosion because there are fewer differential oxidation areas. And it is possible for certain foreign agents to accelerate corrosion, maybe even cause pitting.

But no, it doesn't sound correct. It sounds like a tall tale to assuage you. Peeling occurs because of inadequate adhesion, which translates to something improperly done at the plating shop,

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


Thanks, I thought so!

Trey Chanter
- Portland, Oregon, USA


Hi Trey ,

Intermittent problems with plating peeling on Aluminium Alloy Wheels is most commonly traced to the following factors

1 ) Poor attention being paid to the Zincating step (s ) prior to the initial "Strike" plate

2 ) Contamination of the "Strike" bath with Zinc from the Zincating Stage

3 ) Insufficient thickness in LCD areas of the wheel .

There are of course other causes but these are the major causes found in "aftermarket" wheels .

Best regards

John Tenison-Woods
John Tenison - Woods
- Victoria Australia

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