Hi David,
Lead is more noble than zinc (and slightly less noble than your prop
& shaft). So, yes. A change in noble metal (increased lead surface
exposure) by that amount can contribute to an increased loss of zinc.
We hope it's that simple.
Cheers, Russ
Sweet 35 mk-1
At 09:39 AM 24/12/2015, you wrote:
I forgot to mention one thing that might be related to the zinc
problem. Mid-season, I hit a rock while racing. When the boat was
pulled, the lead was exposed in an area of about 10 square
inches. Could that cause zinc corrosion? I can see that could
create current to the keel bolts, but how would it get from there to
the zincs? Dave
On Dec 24, 2015, at 12:21 PM, Russ & Melody via CnC-List
<<mailto:cnc-list@cnc-list.com>cnc-list@cnc-list.com> wrote:
Hi David,
Normally zinc decay over the course of a year is attributed to
galvanic corrosion, whereas stray current corrosion can happen
rapidly and be very destructive. A change in Galvanic decay is
usually associated with a change in underwater metals (new prop
maybe) or area salinity.
Having said that... I suggest a review of these two primers and
then inspect your bilge pump wiring very thoroughly looking for the
slightest of corrosion and replace anything in the damp area that
is suspect and NO JOINTS BELOW THE SOLE, please.
http://www.pcmarinesurveys.com/AC%20DC%20electrolysis.htm
https://www.youtube.com/watch?v=b3VBBml2J0I
Cheers and Merry Christmas to all, Russ
Sweet 35 mk-1
At 08:47 AM 24/12/2015, you wrote:
When my boat was pulled from the water this year I was surprised
to find that the Max-prop zinc was gone, one of the shaft zincs
was gone and the other was nearly gone. I have had this
configuration in past years and every other year at the end of the
season I could barely justify replacing them because there was so
little metal decay. I know of nothing I did differently this
year. I am on a mooring so rarely plugged into shore power. What
would cause a dramatic increase in zinc decay? Thanks and Happy
Holidays to all! Dave
Aries
1990 C&C 34+
New London, CT
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Dr. David Knecht
Professor of Molecular and Cell Biology
Core Microscopy Facility Director
University of Connecticut
91 N. Eagleville Rd.
Storrs, CT 06269
860-486-2200
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