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Letter 9065
IMPURITIES IN NICKEL PLATING
BATH
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WE WANT TO KNOW THE BEST METHOD TO TEST NITRATE CONTENT IN NICKEL
PLATING BATH AND IN NICKEL SULPHATE . WHAT IS THE MAXIMUM IMPURITES
OF NITRATE ALLOWED IN NICKEL PLATING BATH. HOW TO REMOVE NITRATE FROM
NICKEL PLATING BATH.
PLEASE SUGGEST .
G.VIJAYKUMAR
- COIMBATORE, TN, INDIA
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Dear Vijaykumar,
The Blue ring end point test using .......... as an indicator is
the simple test for Nitrates in Nickel solutions..
The best indicator to determine whether the bath is usable is to
plate a hull cell at 1 amp for 10 minutes at the ususl pH od 4.2 o
4.5. If Pits are seen in profusion you need to make up a new bath.
The tolerance of different propreitory processes to Nitrate varies
very slightly but a safe tolerance could be less than 10 ppm.
The bath can be sold to a maker of Nickel salts for the value of
Nickel it Contains.
If you have time and patience boil the nickel solution in SS 316
containers for 30 minutes ( BOIL..like making tea ) and it is
possible to drive off the Nitrates as the oxide. No laughing matter I
assure you.
You need carbon treat thereafter, make up the brighteners and
carriers. Take care of the Nitric acid in your factory next time and
ensure it is only Sulfuric used to adjust pH.
Good luck.
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