Tinned music wire will rust, and it has been used for making spinnerbaits. Most wire forms are stainless steel, and with wire, there's only a limited number of stainless steel types that can be made into wire, and they don't usually rust.
Make sure what you have purchased is stainless, and if so, contact Jann's and talk to them about the issue.
I've had blades rust, as some are steel, but have never had clevises rust. They're usually made from nickel plated brass and if they corrode it's green.
