Electronic rust control module. Science or Scam?

Depending on how it is set up, it should work. In some of the snow belt states the send a low voltage (unsure of frequency) thru the rebar on bridges. It inhibits rust. To what degree, I do not know. I bet if you google it you should find something.

Sounds like something I could make for $30 maximum. If I do some research. But I live in Scottsdale AZ, no rust here