material coating for leaf springs

A handy person from Bend, OR says:
I am designing a filter enclosure that will be using these leaf springs in a high humidity location and need to know what kind of coating is used on these, rather it is zinc phosphate + oil, electroplated zinc + chromate conversion coating, zinc phosphate + organic coating (usually cathodic electrodeposition epoxy) or other coating. Please get back to me at your greatest convenience.

Thanks,
Brent
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Dave Sr. from SWISCO responded:
I believe the 70-186 is electroplated zinc with a chrome finish. They are rust resistant, but I believe they will rust in time. You could also look at the 70-097 and 70-193 springs. These are made of stainless steel and hold up very well against corrosion. See if these will fit your screen frame.
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