Need some quick Zinc/corrosion help and suggestions - 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 > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 01-24-2009
nk235's Avatar
Senior Member
 
Join Date: Apr 2007
Location: Long Island
Posts: 404
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
nk235 is on a distinguished road
Exclamation Need some quick Zinc/corrosion help and suggestions

I know there is a wealth of information about electrolysis and zincs and bonding and I have been trying to read some of it but I am sort of pressed for time....

My 84' Morgan 323 is new to me and as I bought it last Spring. I am storing it in the water at my local dock. Today when I went to check on it I took a close look at the shaft and stuffing box. I can't remember exactly what they looked like during the summer as the boat is still so new to me but today it looked very green and pretty corroded and I am almost positive it didn't look that way when I kept it on my mooring during the spring summer and fall. I changed the shaft zinc in the end of August so it has been about 6 months.

One major difference of how I keep the boat is that in the offseason it is in a slip, connected to shore power with a temp regulated heater in the cabin connected to the boats electrical system. Anyway I am going down to the boat again tomorrow with someone who knows a lot about boats and maintenance and I think I will also be able to see the condition of the shaft zinc since it will be calm winds tomorrow. (today was pretty windy and the water was turbulent so I could not see the condition of the zinc as it was very blurry)

So my question is lets say the water is clear and I can see the shaft zinc tomorrow and if it is very eaten away what are my options? The marina it is at now has no lift, the boat is shrink wrapped and there is no way I am de-winterizing it and sailing it somewhere else anytime before mid April. Short of paying a fiver with a dry suit, is there anyway I could hang a zinc around the shaft with metal wire? Place a zinc somewhere else inside the boat that is accessible? I honestly think the issue is related to the Shore Power since I never saw this the season out on my mooring and I don't want it to ruin my boat because of stray current. Any suggestions or help would appreciated.
Thanks in advance.
__________________
Morgan 323
Reply With Quote Share with Facebook
  #2  
Old 01-24-2009
Lynger1
 
Join Date: Jan 2009
Location: Brisbane
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lynger1 is on a distinguished road
One major difference of how I keep the boat is that in the off season it is in a slip, connected to shore power with a temp regulated heater in the cabin connected to the boats electrical system.

I have that problem long time ago
If you use shore power in winter on blocks with no earth
You need to earth boat with 60cm brass bar hit it in the ground below boat and earth shore power from boat to this

Other thing you can do is put clamp on prop-shaft with earth during storage
Hope this Will solve you're problem
Reply With Quote Share with Facebook
  #3  
Old 01-24-2009
nk235's Avatar
Senior Member
 
Join Date: Apr 2007
Location: Long Island
Posts: 404
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
nk235 is on a distinguished road
Quote:
Originally Posted by lynger1 View Post
One major difference of how I keep the boat is that in the off season it is in a slip, connected to shore power with a temp regulated heater in the cabin connected to the boats electrical system.

I have that problem long time ago
If you use shore power in winter on blocks with no earth
You need to earth boat with 60cm brass bar hit it in the ground below boat and earth shore power from boat to this

Other thing you can do is put clamp on prop-shaft with earth during storage
Hope this Will solve you're problem
Thanks for the suggestion but the boat is actually in the water in a slip - not on land on blocks.
__________________
Morgan 323
Reply With Quote Share with Facebook
  #4  
Old 01-24-2009
Lynger1
 
Join Date: Jan 2009
Location: Brisbane
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lynger1 is on a distinguished road
Quote:
Originally Posted by nk235 View Post
Thanks for the suggestion but the boat is actually in the water in a slip - not on land on blocks.
Same apply earth to shore power suply
I asume you get 3 pin supply + and- and earth make a return fromm drive shaft to this
Reply With Quote Share with Facebook
  #5  
Old 01-24-2009
camaraderie's Avatar
moderate?
 
Join Date: May 2002
Location: East Coast
Posts: 13,878
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 15
camaraderie is a jewel in the rough camaraderie is a jewel in the rough camaraderie is a jewel in the rough
Green is not a big problem...but get some good light on the area and inspect closely for any sign of pink which is a big problem.
If the zinc has not been changed since last spring...you are overdue for an inspection but with cold water and NO pink...you can probably hold off a bit. If there IS electrolysis going on, you can hang a zinc fish on a wire from a grounded part of the boat to overboard to try minimize damage but that is no guarantee.
The only way to truly protect the shaft is with a shaft zinc...which means a diver if you are still concerned after a close inspection.
__________________
No longer posting. Reach me by PM!
Reply With Quote Share with Facebook
  #6  
Old 01-24-2009
nk235's Avatar
Senior Member
 
Join Date: Apr 2007
Location: Long Island
Posts: 404
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
nk235 is on a distinguished road
Cam,
Thanks for the suggestion. I will try and take some pictures tomorrow morning and will post them so if you happen to check back maybe you can let me know what you think. Also the zinc has been changed at the end of the summer, late August 08' - not the spring but either way I should be able to se the status of it tomorrow assuming the water in the slip is nice a calm.
Thanks again
__________________
Morgan 323
Reply With Quote Share with Facebook
  #7  
Old 01-25-2009
Fstbttms's Avatar
I don't discuss my member
 
Join Date: Feb 2003
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 2,043
Thanks: 3
Thanked 18 Times in 18 Posts
Rep Power: 12
Fstbttms will become famous soon enough
It would have to be a fairly extreme situation for your zinc to have depleted and serious damage to your running gear occur within 5 months. Not that it couldn't happen, but it would be unusual. You are probably fine. I don't know what diver rates are like in your area, but here it would cost you in the vicinity of $50.00 for an inspection. If your diver is reasonable (like me ) that price would include the installation of a zinc or two (zincs would likely be extra). Couldn't hurt to carry two on your shaft instead of one, BTW.
Reply With Quote Share with Facebook
  #8  
Old 01-25-2009
nk235's Avatar
Senior Member
 
Join Date: Apr 2007
Location: Long Island
Posts: 404
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
nk235 is on a distinguished road
Fstbottoms - if you lived here I would take you up on that offer in a heartbeat. It is also 17 degrees F here today though so I would need to find a diver with a dry suit.

Ok so here is the update. I uploaded a picture of what the shaft looks so now that you can all see it firsthand, what do you think? Also I coudl see that the zinc on the shaft is very deteriorated and half missing so I know there is a problem some where.

I also found out that the through holes on the boat are not bonded, but they look to be in good shape. Just the shaft is what scares me. What I am doing for the time being is I turned off the shore power and disconnected the cord. I am going to polish the inside portion of the shaft with a stainless steel brush and bronze polish. I am then going to get one of those fish zinc things with a 15' long wire. I am going to wrap the end of the wire around the inside portion of the shaft which is shown in the picture and then run the wire out into the cockpit and over the side where the fish zinc will sit in the water. Do you think this will help?

Thanks again for everyones responses

[IMG]shaft[/IMG]
__________________
Morgan 323
Reply With Quote Share with Facebook
  #9  
Old 01-25-2009
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
NK235—

That kind of surface corrosion is pretty normal for a bronze shaft, especially inside the boat. Exactly where are you seeing a zinc in this photo. Zincs are normally on the exterior portion of the shaft, as the need to be immersed in water to function properly. Occasionally, you'll see one on a shaft inside the boat, but that is generally as a safety measure, so the prop shaft can't fall out....but not to prevent corrosion.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #10  
Old 01-25-2009
camaraderie's Avatar
moderate?
 
Join Date: May 2002
Location: East Coast
Posts: 13,878
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 15
camaraderie is a jewel in the rough camaraderie is a jewel in the rough camaraderie is a jewel in the rough
NK...I don't see anything unusual there. No worries till spring based on that picture...but you might want to get some better hose clamps on that stuffing tube.
__________________
No longer posting. Reach me by PM!
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



All times are GMT -4. The time now is 09:10 PM.

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.