electronic rust prevention

Before you go off! I have searched and to my surprise found nothing previous?

Well do they work? ERPS, CAT, Rust Stop, RS2000? They all claim to work but?

The cathode system works on boats because the are surrounded by water the only way it can work dry is if it has a means to carry the ions from the sacrificial adones back through the metal to be protected. Metal rusts because it loses ions and the sacrificial adode (zinc) gives up ions back to the steel to prevent rust.

No I am not Dr Karl, but I read a report he did on sacrificial adodes.

The RS2000 has a combination of cathode and electric current and claims to work for that reason.

So theory aside what is the reality?
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