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How much corrosion resistance from chromating nickel

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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
plating engineer - Sanford, 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.

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

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+++++++ -- 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.

Robert H Probert Robert H Probert Technical Services Garner, North Carolina Editor's note:        Mr. Probert is the    author of Aluminum How-To / Aluminio El Como