Aluminum foil prevents rust

[Malcolm McLeod]

3 replies about cathodes; 0 about neutering. Interesting crowd.

[William Fretwell]

3 replies about cathodes; 0 about neutering. Interesting crowd.

There is no galvanic protection going on either, unless your wrapped tools are immersed in electrolyte.
Aluminium with 5% zinc is a good long lasting sacrificial anode for salt water. Magnesium works for fresh water, and of course zinc the classic sacrificial anode. They all rely on excellent electrical connection to a common ground or you protect one part and corrode another.

This is about excluding air with moisture and air movement that would bring more moisture.