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topic 379

Mirror bright Platinum electroplating


Dear Sir,
We are looking for a procedure for platinum electroplating in order to obtain mirror type surfaces. The surfaces are required to be resistance under cathodizing at very negative potentials. We tried to sputter platinum on glass with and without a thin layer of chromium, however, the platinum peeled off under the required conditions. I will appreciate any advise. Sincerely,

Daniel Mandler
The Hebrew University - Israel


I have plated mirror-brite platinum on thin cylindrical surfaces from a Chloroplatinoic acid bath at approximately 150 ASF. The only problem with this deposit is that it is highly stressed. A gold strike prior to platinum plate assures adhesion. Lower current densities gives less stressed deposits, but plates out in the familiar grey appearance. These deposits can be glass bead blasted (very light) to a highly reflective finish.

Dave Kinghorn
Dave Kinghorn
Chemical Engineer
SUNNYvale, California

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