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Originally Posted by Etacovda
Perhaps;
The point for me is, why the hell should you have to suffer possible problems over 25c of nickel, or perhaps $1 of anodization?
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Why risk dirtying a facecloth when you can wrap it in plastic before use? Tarnishing
of the cap is not a problem - unless scopic chunks of aluminum oxide are actually crumbling off - the corrosion of the cap
guards against corrosion problems for the copper/brass. Maybe that's too much for the average customer to digest.
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Originally Posted by Etacovda
A water heater tank has a heater in it... will this make it more electrically conductive, which would encourage corrosion? thus requiring an anode?
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Good thinking. Galvanic corrosion in electric heaters must be complicated. I can't recall if gas heaters employ an aluminum anode. I guess they
could...
However, a
basic rule in galvanically corroding
pairs is that the cathode will corrode more slowly than by itself. So why not apply that. Add aluminum to an otherwise copper system, the copper is protected.
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Originally Posted by greenman100
are (grandma's pots) in contact with water and copper?
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The tailpipe in her stainless sink is brass, if not the whole drain system. The water flows out of copper pipes, and may even be green from that. She likely soaks aluminum with various metals and solvents... I don't know. We want a real world answer to this question of
how much corrosion, and unfortunately only time has the answer.