[alberg30] zinc

[John Birch]

From: John Birch <sunstone at idirect.com>

For aluminium use a magnesium anode, available at any outboard shop.  Zinc is too
close to aluminium to protect it, but it is just the ticket to protect other
metals.
John

Scott Wallace wrote:

> From:   Scott Wallace <tristan at one.net>
>
> Can you use zincs on outboards, too?
>
> Scott
>
> Robert Kirk wrote:
>
> > From: Robert Kirk <kirk at neptune.gsfc.nasa.gov>
> >
> > At 09:43 AM 11/17/99 -0500, George Dinwiddie wrote:
> >
> > >Anytime you have dissimilar metals in a conductive solution,
> > >you'll get electrolytic corrosion.  Fresh water is not nearly
> > >so conductive as salt, so the speed of the corrosion may be
> > >slower, but it'll still happen.  Zincs are a cheap means of
> > >protecting your bronze.
> >
> > George is right, you do need them.  I use one of those teardrop shaped
> > zincs that fit on an adapter which screws onto the end of the
> > propeller.  They are readily available in the boat stores and simplicity to
> > replace each year.  Each year it comes off corroded enough to show that I
> > was right to use one, but not completely corroded away.
> >
> > I have heard that some configurations don't have enough room between the
> > end of the shaft and the rudder to fit them, but they only require an inch
> > or two.
> >
> > Bob Kirk
> > Isobar #181
> >
> >
>
> 

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