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Galvanised Plating on Cable Containment - Sacrificial Anode?

CSkinner

I've been learning about sacrificial anodes recently.

I was given a formula to calculate how long a sacrificial anode will last; using the total mass, atomic mass and ionic charge of the sacrificial material, as well as the electrical current running through the anode.

It brought my attention to Galvanised steel basket tray.
Galvanised steel has a covering of Zinc[2+] to protect the steel from the environment; and it would also have an induced current from cables running along it.

But would there be a Cathode to complete this circuit? Perhaps where the containment is grounded?
It would be interesting if grounding the containment actually accelerates the decay of the zinc.

Any thoughts would be appreciated.

Thanks

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    Be aware that AC does not work like  this, more or less the same amount of metal is removed on one half cycle that is put back when the polarity reverses.

    In any case, trunking and similar is not normally buried or immersed in the way that would be necessary to complete the circuit.

    Mike.

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    Be aware that AC does not work like  this, more or less the same amount of metal is removed on one half cycle that is put back when the polarity reverses.

    In any case, trunking and similar is not normally buried or immersed in the way that would be necessary to complete the circuit.

    Mike.

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