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sarge
If my memory serves...
Sun Sep 2, 2018 09:31
2601:982:8201:63b8:c4aa:1d31:9a06:2f85

...the whole galvanic corrosion thing requires dis-similar metals in intimate contact, an electrical field, and some sort of electrolytic presence, such as saltwater. Bits of one material therefore become sacrificial anodes to protect the other material.

Agree with you both. Remove the field (unhook the battery) and that should be as effective as anything, you'd think.

Usually a spike to earth a building is used as a "perimeter ground". Its purpose is two-fold. First, to earth rotating equipment, such as air-handler motors, appliances, and the like so those things that like clean earthing such as electronics have an easier time of it. In the physics research field, whenever I designed precision environments I went one better and included special power circuits with coloured sockets that had their own perimeter earthing; no motors (or resistive heated things like electric kettles) allowed on those circuits at all.

The other more common reason is simply to earth lightning strikes on the building. My house actually was a good example of both, for I was having dreadful issues with electronic interference, which turned out to be solved when I discovered the cable to the spike in the ground had been cooked and broken. Apparently lightning had hit the power pole at the street some point, and ran to earth through the house. Luckily the spike ground protected everything in the house, even the electronics, but gave its all in the process.

Check yours regularly. Grin!

  • Waxoxl is the name? - Alex, Sun Sep 2 05:07
    Messy stuff. These days 'Dinitrol' is the preferred rust proofer.. Not sure that a ground spike is much help in preventing galvanic corrosion process in cars - maybe in a building?
    • If my memory serves... - sarge, Sun Sep 2 09:31
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