Cruisers Forum

Join CruisersForum Today

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 12-11-2010, 05:35   #1
Registered User

Join Date: May 2009
Location: Isle of Anglesey
Boat: A few!
Posts: 50
Copper Antifouling Issues

I manage a cat in Palma that has recently been coppercoated. About six months later we noticed that we had a leaking elbow, looking further we think that most of the elbows above thru-hulls are becoming fragile. Diving over the side we can see a light circular area around each skin fitting.

We think that the zinc used to strengthen the bronze is being drawn out of the elbows by the copper. Is this possible? Coppercoat had no explaination for this.

We came across some historical documents showing how once timber ships had been sheeved in copper, the galvanising disappeared from the nails leading them to rot.

in addition, we can get a continuity reading between 2 thru hulls, even though Coppercoat quoting the rather weak Branleys law say this is impossible.

Anybody shed any light on this for me?

caribcat is offline   Reply With Quote
Old 12-11-2010, 11:40   #2
Registered User
Astrid's Avatar

Join Date: Oct 2008
Location: Northern British Columbia, part of the time in Prince Rupert and part of the time on Moresby Island.
Boat: 50-ft steel Ketch
Posts: 1,883
Send a message via MSN to Astrid Send a message via Yahoo to Astrid
Proper Bronze is an alloy of Tin and copper, sometimes with silicon, phosphorus, aluminium, or manganese. Brass is an alloy of copper and zinc and probably should not be used for marine applications. So if your fittings are brass instead of bronze, there may be problem if the fittings are not bonded, but I am not so sure the copper coat has much to do with that, but anything is possible.

By the way, the cure for the corroding action between coated iron nails and copper sheathing on wooden ships you noted, was eventually cured by use of copper nails instead of tinned iron nails.
'Tis evening on the moorland free,The starlit wave is still: Home is the sailor from the sea, The hunter from the hill.
Astrid is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
A Copper-Nickel Sailboat GordMay The Library 11 03-01-2012 15:43
Copper Tube for Propane off-the-grid Plumbing Systems and Fixtures 74 11-07-2010 21:17
Copper Triangle prohor Construction, Maintenance & Refit 1 07-02-2010 21:47
Copper Antifouling on a Painted Aluminum Hull? svpresent Construction, Maintenance & Refit 17 09-09-2009 14:23
Plumbers Copper Strapping wind rose ll Marine Electronics 2 22-06-2007 16:34

Advertise Here

All times are GMT -7. The time now is 08:48.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.