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Could you share the circuit and document when you find them? I am interested to know more.
Frankly I doubt as corrosion happens over time, those that consume electricity cannot be a practical solution, using the differences of electronics-charge for protection is more feasible.
You could get galvanised-zince spray to spray a layer for dispense, on top of that you can spray a layer of normal paint. This would give a reasonable good amount of protection that most likely to outlast the structure or equipment themselves.
From my experience these things don't work on cars. There are companies selling these products but they don't work.
Cathodic protection works very well for steel pipelines buried in the ground. The idea is to make the pipe negative with respective to the ground. This is achieved with a transformer rectifier unit, some of which are automatic with and electronic thyristor controller with feedback and setpopint. Other systems use sacrificial anodes which are usually magnesium ground beds buried in the ground and bonded to the pipe to be protected. The sacrificial anodes are designed to have a certain lifespan - 10 years 20 years etc.