[C38] zincs and toe rail corrosion

[Don Strong]

Chuck: Your idea about stray current is a good one.

Since my shaft to prop key dissolved, I have been more careful with my 
zincs, do not leave the boat plugged in when gone, and our marina 
upgraded the electrical and now claim, "no stray current."

Will check toe rail corrosion on DC, but I do believe that it is a 
fossil problem and has not increased in the last 5 years or so.

D


On 4/8/12 6:23 AM, Charles wrote:
> Steve,
> You clearly have some current flowing through your toe rail!  I have 
> wondered in the past about the issue of aluminum toe rails secured 
> with stainless bolts. But since everyone seems to do this.
> If I had to guess, I would say look to your mast wiring.  Don't know 
> if you have grounded your mast to your keel as part of a lighting 
> protection system, but this too could be part of the puzzle.  With the 
> radios, radar, lights, etc. making the trip up the mast and the 
> problems many of us had had with the conduit failing  (I replaced mine 
> five years ago), it seems this would be the likely place to begin.
>
> Also, have you looked at your zincs lately?  Some friends of mine had 
> a diver clean their bottom last summer and discovered one of the zincs 
> totally gone and the other ready to crumble.  They are now throwing a 
> third sacrificial zinc attached to their toe rail and rigging over the 
> side whenever they are on a dock, which seems to have solved their 
> problem.
>
> Hopefully, Tom T. is going to weigh in on this???  Tom?  You out there?
>
> Chuck Finn
> Mighty Quinn  #114
> Great Lakes
>
>
> On 4/8/2012 2:50 AM, Steve Smolinske wrote:
>>
>> Doing some dinking on the boat today and noticed a mound about ½" 
>> tall of corrosion on one of the bolts in the toe rail, Ive not had a 
>> corrosion problem until this year, have also noticed it falling below 
>> decks onto the shelf in the quarter berth from a few bolts.  Anyone 
>> else experienced piles like these? Any suggestions as to solving it 
>> and what might be causing it?
>>
>> Steve
>>
>> #312 Peregrine
>>
>> Seattle
>>
>>
>>
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>
>
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-- 
Donald R. Strong
Professor
Dept. of Evolution and Ecology
University of California, Davis 95616

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