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Older cars, and less expensive cars, usually have stamped
steel rims. Newer and fancier cars usually have pressure
cast aluminum wheels with fancy spoke shapes. Either can be
chrome plated.
There are variations in the plating process, but one
sequence for aluminum wheels could be: clean the rim in hot
inhibited caustic, rinse, desmut in nitric acid, rinse,
zincate, strip in nitric acid, rinse, re-zincate, rinse,
electroless nickel plate, rinse, acid copper plate, rinse,
buff, caustic clean, rinse, activate in sulfuric acid,
rinse, semi-bright nickel plate, bright nickel plate, rinse,
chromium plate, rinse, dry.

Ted Mooney, P.E.
finishing.com Inc. - Brick,
NJ
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