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Letter 26104
Electroplating rhodium using rhodium iii
chloride hydrate, 99.999%
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I want to electroplate Rhodium iii Chloride hydrate onto aluminum
electrodes. We think that we can deposit rhodium onto a metal without
using sulphuric acid but just simple purified water. We are going to
use platinum anode in our bath. Is it possible do you think? WHAT is
the point of using sulphuric acid.
Denis C 
research student at university - Sheffield, England (UK)
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You can only plate an ion out of solution if it is in solution. If
a salt is virtually insoluble in water, then there can be virtually
no metal ions in solution, so you can't plate them out. If the salt
is highly water soluble, and it sounds like it may be in this case,
you can reduce the metal onto the cathode with electricity.
That doesn't mean it will be a sound, worthwhile, plated layer.
Then again, it won't be anyway if directly deposited onto an aluminum
cathode.
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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