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46003
How much corrosion resistance from
chromating nickel
+++++++
Is there a commercially available chromate for bright nickel and
is there any corrosion data to show how much corrosion resistance is
improved.
Thomas Christian
chemist - Apex, North Carolina
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To my knowledge you cannot do a chromate conversion coating on
nickel. However, it would not surprise me to be advised that there is
chromate in the tarnish-ban post treatments sometimes done on nickel.
I think you should inquire of Technic or another supplier of nickel
and electroless nickel post-treatments as to whether there is chrome
in them and how long they can be expected to keep the nickel from
tarnishing.
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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+++++++ -- 1st of two
simultaneous responses
Could there be a confusion of terms and you are talking about real
chrome, Thomas? G. Marrufo-Mexico
Guillermo Marrufo
Monterrey, NL, Mexico
+++++++ -- 2nd of two
simultaneous responses
The tendency for bare nickel to corrode will be reduced by a mere
dip in ANY hex chrome containing solution including the rinse water
following the zinc or aluminum chromate. This will not be a
"conversion coating", but it will deter tarnish.


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