This is common in saltwater based boats. A ZINK block is
attached on or near the outdrive as the sacrificial Lamb of metal.
Rich
> ----------
> From: Roland Dudley[SMTP:cobra@cdc.hp.com]
> Reply To: Roland Dudley
> Sent: Tuesday, May 27, 1997 2:13 PM
> To: TBallou@lanmail.rmc.com
> Cc: tigers@autox.team.net
> Subject: Re: radiators and water chemistry
>
> > Copper and aluminum are both excellent heat transfer materials.
> However they
> > don't mix well. In fact, they are bitter enemies! When they are
> put
> > together the result is rapid and destructive corrosion. Even when
> linked
>
> > tiles on the scape shuttle), but doesn't transfer heat well at all.
> If you
> > are going to switch some components, you need to think about
> switching
> > everything - radiator and heater core (and thermostat). Otherwise
> you will
> > have constructed a battery and the aluminum component will be
> sacrificial
> > anode. Could be your intake, radiator, those expensive aluminum
> heads.
>
> Quite true. I've notice the same thing in my aluminum water pump body
> and intake manifold. Here's a counter measures that was suggested to
> me: Install a chunk of magnesium in the radiator or header tank as a
> sacrificial anode, perhaps suspended by a stainless wire or chain so
> that it can be easily checked and replaced. Anyone ever tried this?
>
> Roland
>
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