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Letter 42055
How to know if a part has been processed
with black oxide or black zinc [Costa Rica]
August 28, 2006
Hi,
Our local plating supplier has sent us a part that he says is black
zinc. We did a small test submerging in salty water for 3 days and in
some parts the black came off. I suspect that the part has black
oxide instead of black zinc, is there a test (chemical) that we can
use to be sure of this?
Thank you,
Alejandro Jiron
Consumer - Cartago, Costa Rica
October 14, 2006
Dear Alenjandro Jiron
Its easy to check the parts with zincblack Just dip a part in
Con.Hcl, U will get vigorous gassing(or Stripping) if it is zinc
black.
Shetty
- Bangalore, India
November 28, 2006
Dear,
Oxide coating are remove in dilute cyanide solution while zinc
black do not.
GULSHAN SACHDEV
- MORADABAD U.P. INDIA
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