Galvoniv problems on saildrive of Volvo MD1120 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 05-10-2006
javogs
 
Join Date: Oct 2001
Location: Buffalo NY
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
javogs is on a distinguished road
Galvoniv problems on saildrive of Volvo MD1120

The boat is 26 years old and every year the saildrive looks worse and worse. The previous owner always felt it necessary to paint the saildrive and the area around it with a very heavy copper paint in order to potect it. My feeling is just the opposite. The copper will attract the to softestest metal, aluminum, where as the Zinks look hardly even touched.
Not sure what to do. Spray paint the saildrive with an antifouling paint or they have this zink spray paint
Any Ideas
Reply With Quote Share with Facebook
  #2  
Old 05-10-2006
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Generally, it is a very, very bad idea to paint any metal underwater with a copper-based anti-fouling paint. It will inevitably cause galvanic corrosion issues, and will accellerate the problems with corrosion, not protect the underlying metal.

The best paints for painting your saildrive really depend on what the saildrive is made of. If it is aluminum, which is the most typical material used, then a good two-part epoxy paint might be a good solution, followed by a tin-based anti-fouling paint. The epoxy will give it a strong, hard, base coat, to protect and seal the aluminum from further enviromental attack, while the tin-based anti-fouling, will help retard any underwater growth.

Most saildrive manufacturers will warn about using traditional copper-based anti-fouling paints on their equipment, as seen in the pdf file located http://www.practical-sailor.com/news...88Letters2.pdf .

Hope this helps.
Reply With Quote Share with Facebook
  #3  
Old 05-11-2006
javogs
 
Join Date: Oct 2001
Location: Buffalo NY
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
javogs is on a distinguished road
THANK YOU - Pettit makes a 2-part epoxy paint called Aluma-protect. It is made to protect aluminum hulled boats, Outboad and outdrive lower units. This sounds like what I need .
Thanks again,
javogs
Reply With Quote Share with Facebook
  #4  
Old 05-11-2006
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Glad to help. BTW, the previous owner sounds fairly clueless. A good tin-based anti-fouling over the Pettit might help keep the marine growth off of the saildrive.
Reply With Quote Share with Facebook
  #5  
Old 05-11-2006
Junior Member
 
Join Date: May 2006
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Ele5 is on a distinguished road
The Usual Galvanic Problem on Saildrive

The saildrive has an aluminum hull and a steel made shaft. In this case aluminum plays the "sacrificial anode" if it gets in contact with the seawater. Good painting will do it as long as the alu is 100% sealed.

elena

Last edited by Ele5; 05-11-2006 at 02:04 PM.
Reply With Quote Share with Facebook
  #6  
Old 05-11-2006
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Quote:
Originally Posted by Ele5
The saildrive has an aluminum hull and a steel made shaft. In this case aluminum plays the "sacrificial anode" if it gets in contact with the seawater. Good painting will do it as long as the alu is 100% sealed.

elena
Yes, and using a Copper-based anti-fouling paint on the saildrive will greatly accellerate the galvanic corrosion problems.
Reply With Quote Share with Facebook
  #7  
Old 05-11-2006
Junior Member
 
Join Date: May 2006
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Ele5 is on a distinguished road
I should have specified: Any "non metallous" One-Component-Paint suitable for Metal/Seawater conditions will do it.
elena
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
At sea. Volvo Ocean Race: Pirates of the Caribbean fix keel, batteries and sail problems @ BYM Sailing News NewsReader News Feeds 0 04-15-2006 04:15 AM
At sea. Volvo Ocean Race: Pirates of the Caribbean struggling with sail & electronic problems @ BYM Sailing News NewsReader News Feeds 0 04-14-2006 05:15 PM
At sea. Volvo Ocean Race: Brasil 1 spots spinnaker problems on Black Pearl @ BYM Sailing News NewsReader News Feeds 0 04-12-2006 02:15 PM
Volvo Folding vs Maxprop feathering uri General Discussion (sailing related) 1 06-27-2002 07:06 PM


All times are GMT -4. The time now is 03:18 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.