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So zinc is both a cathodic protector and a 'paint'.  That's very clever.  Does water attack the zinc carbonate, or is it also ok in fresh water?  sea water?

I guess zincalum is better because aluminium oxide is so hard and inert.

Thanks for the chemistry lesson!

by njh on Mon Jan 25th, 2010 at 05:10:10 PM EST
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Yes, as long as it is a complete coating it works as a kind of paint, if it is pierced it begins to work as a sacrificial anode, at least at this area.
As far as I know zinc carbonate is soluble in fresh water only in very small amounts, but I don't know about sea water. I think this depends on the kind and amount of other ions (esp. chlorine) present, and as one can deduce from the fact that sacrificial anodes work, it will be destroyed when the zinc is connected electrically to a chemical nobler metal.
Don't know about Zincalum.
by josch222 on Tue Jan 26th, 2010 at 04:37:44 AM EST
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Maybe Cl- ions will have the same effect as for alumina, ie, hole piercing!
by Xavier in Paris on Tue Feb 9th, 2010 at 12:56:42 PM EST
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