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anodes

gotta say as a new comer to the cut i luv this place for info.
i occurred to me that as im going to wait till spring to fit new anodes to my 34 v hull and don't know if there are even any of the old ones left maybe as a temp solution i could dangle a couple of new anodes into the water by thick copper cables firmly attached to the the steel coach roof. the boat will remain stationary
perfect use for very cheap and redundant battery jumper leads that aren't up to the job on cars
thanks

Asked by: mb  | 5.49pm, Friday 6 September


WW says:

Although your theory is essentially correct, unfortunately in practice it will not work.
The galvanic voltages are so small that it would be very difficult to get sufficiently good electrical connections for there to be any appreciable protection. It is always noticeable that anodes only seem to provide protection to the immediate surrounding area of hull. A good paint layer is the best protection.

Rupert Smedley  | 9.19PM, Friday 6 September

There are hang-on anodes produced for protecting GRP yacht engines when not underway- mainly used on racing yachts where you don't want additional lumps deflecting from smooth water flow! However as Rupert points out they won't be that effective- while they might protect an engine they won't protect a hull. Also, adding copper cable is not a good idea- copper is more inert than steel, so you would set up some complex galvanic cells- and in essence the steel and magnesium would be protecting the copper- so make the steel more likely to corrode.

Mark Langley  | 10.32AM, Sunday 8 September


Readers say:

thanks
thats even more interesting, about the "complex galvanic cells- and in essence the steel and magnesium"...so as its not a racing narrow boat i won't be using them :)

mb  | 11.31AM, Sunday 8 September

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