Repair & maintenance: Zinc Anodes

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Zinc Anodes

Printed From: Yachts and Yachting Online
Category: General
Forum Name: Repair & maintenance
Forum Discription: Questions & tips on the subject
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=7863
Printed Date: 14 May 25 at 9:45pm
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com

Topic: Zinc Anodes

Posted By: Annabel
Subject: Zinc Anodes
Date Posted: 19 May 11 at 9:58pm

We have had a lot of trouble with zinc anodes coming off our shaft, it doesn't matter who attaches it it comes off before its life is through. Does an anode have to be actually attached to the boat to work or could we just hang an anode off the back when we are at anchor. We will of course start with an attached anode to the shaft as well, and we have one on the prop also. We have a fiberglass yacht which is stored on the hardstand for nine months of the year in the Med.
Thanks

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Private Collection

Replies:

Posted By: RS400atC
Date Posted: 19 May 11 at 10:16pm

Anodes have to be electrically bonded to what they are supposed to protect.
They also work much better if physically close.
Personally i've never had much trouble with shaft anodes coming lose.
MG Duff is the brand I've always used.
Maybe you have a metric/imperial mismatch and it's just too loose?
They fit quite exactly.
Perhaps the shaft is worn?
You should use the zinc plated screws provided, with star washers (and loctite if possible).

Posted By: catmandoo
Date Posted: 21 May 11 at 11:17am

yes you are correct , mg duff make anodes specifically for hanging off your boat when moored ,they have a conductive tether which is attached to suitable point on boat.

http://www.anodeoutlet.co.uk/product/423/zd57lkit/ - http://www.anodeoutlet.co.uk/product/423/zd57lkit/

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