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Hot dip galvanized vs. standard zinc plated in 95% humidity 60 degree constant temp.

I am providing steel conduit and hardware to be installed in a freight tunnel system in Chicago. Several of our components are simply zinc plated. I need to provide some information on the lifecycle of Zinc plating in that tunnel environment, which is reported to be 95% humidity at 60 °F constant. Is there a corrosion resistance chart available that I could use for reference.

Steve Hickernell
communications - Wadsworth, Ohio, USA
2001

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