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How to get a good finish on brass wire and pipe
I am the quality Manager in company produce copper wires and pipes
(brasses ) we use dichromate washing for good surface finishing after treatment with suphuric acid 10 %
we have unshining surface and some spots.
please help us
production - Cairo, Helwan, Egypt
Perhaps you can get a local process supplier in to look at your operation, Nagyelgendy, but I don't think you will get a shining surface without a bright dip step. Usually these involve nitric acid, although on a smaller scale or with cleaner work you might be able to use stabilized hydrogen peroxide in your sulfuric acid to provide the required oxidizing power.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey