If you leave any metal outside in the weather it will rust, right?
We abused some nonstructural studs to test our corrosion resistance. We mixed a bundle of studs, some with hexavalent chrome chemtreat and some with InterCoat®ChemGuard. We put them outdoors in the elements near our plant in Gary, Indiana for one year.
When we opened the bundle, here’s what we found:
Bundle of Studs 
HDG G40 Hexavalent Chemtreat Studs 
InterCoat®ChemGuard Coated Studs