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Letter 26048
Alternate finish needed for blued spring
clips
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I currently have a rust issue with a 0.010" thick cold rolled
annealed spring clip. It is natural blued after hardening. These
parts are used in a chassis that is installed in a CO environment;
not exposed to extreme elements. Our customers have advised these
clips are rusting after they have been in the field for a period of
time. I am looking for an alternative finish that will prevent this
without changing the integrity of the heat treating process. Please
advise your recommendation(s). Thanks in advance!
Tory Giammanco
Principal Engr. - Telecom - Rolling Meadows, IL, USA
+++
These oxide finishes offer little if any corrosion resistance. You
may need to do something more radical like zinc plating them, but
since the exposure is mild you could try a water soluble wax or
lacquer, or a light oiling of your blued finish first. Your local
plating supplies distributor should be able to suggest such a dip.
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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With Zinc plating you will have to consider hydrogen
embrittlement. Wax, oil or simple dip coat paint are easy options.
Ecoating is another option you can try.
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