Well, I was once a chemist, but not anymore.  But I do know that zinc
has a higher electrochemical potential than the iron and
aluminum/magnesium alloys found in our engines.  That means it more
readily donates its unpaired electrons in solution than the others, and
is consumed first.  Hence, the term "sacrificial anode."  This forms
zinc salts, and I can't imagine them causing any problems with the
coolant.

I wouldn't expect to get any more than the recommended two years out of
standard coolant however, because as the normal acids form the zinc will
be "sacrificed" quickly.

The zinc should be grounded to the case, and that is how the $50/pair
Z-Sticks from FGA work.  They are supposed to replace the water jacket
drain plugs on each side of the case. Kinda pricey, but probably worth
it.

I may experiment with attaching a water heater sacrificial anode to one
of the plugs in a core I have. It would be another nice "trick" to throw
at the problem along with using Dexcool.

--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext. 8208

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