Most of the corrosion resistance for the base metal comes from the nickel.
Additional corrosion resistance for the nickel comes from the chrome coating.
Without the chrome, the nickel will darken and dull with age and exposure.
It will last much longer with the chrome, although eventually as you know even chrome plated parts will begin to show its wear.
So it depends on what kind of exposure your parts will have to the elements.
If you want to simulate chrome with nickel, use the copy chrome. It is nickel with a little bit of cobalt in it to give it that slight bluish tint that chrome has (as opposed to the slightly yellowish tint that nickel has)
Ken.
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