Zincs - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 31 Old 03-06-2014
Dirt Free
 
boatpoker's Avatar
 
Join Date: Jul 2008
Location: Toronto
Posts: 1,157
Thanks: 9
Thanked 31 Times in 30 Posts
Rep Power: 7
 
Re: Zincs

you got it.

Dirt People Scare me
boatpoker is online now  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 31 Old 03-06-2014
Once known as Hartley18
 
Classic30's Avatar
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,794
Thanks: 45
Thanked 65 Times in 65 Posts
Rep Power: 9
   
Dock
Re: Zincs

Quote:
Originally Posted by blewinn View Post
Thanks for the replies. So pretty much if I have a zinc on the prop shaft and insure that everything metal on the boat is connected to the prop shaft as in grounded, I will be good to go.
Zinc on the prop shaft, yes.. but the jury is out on whether or not everything metal should be grounded to the prop shaft also.

-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
Classic30 is offline  
Quote Quick Reply Share with Facebook
post #13 of 31 Old 03-06-2014
Dirt Free
 
boatpoker's Avatar
 
Join Date: Jul 2008
Location: Toronto
Posts: 1,157
Thanks: 9
Thanked 31 Times in 30 Posts
Rep Power: 7
 
Re: Zincs

Quote:
Originally Posted by Classic30 View Post
Zinc on the prop shaft, yes.. but the jury is out on whether or not everything metal should be grounded to the prop shaft also.
Not sure which jury you mean but ABYC "E-2 Cathodic Protection" requires bonding.

Dirt People Scare me
boatpoker is online now  
Quote Quick Reply Share with Facebook
post #14 of 31 Old 03-06-2014
Once known as Hartley18
 
Classic30's Avatar
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,794
Thanks: 45
Thanked 65 Times in 65 Posts
Rep Power: 9
   
Dock
Re: Zincs

Quote:
Originally Posted by boatpoker View Post
Not sure which jury you mean but ABYC "E-2 Cathodic Protection" requires bonding.
The on-line jury made up of experienced sailors.

Fine.. go for your life. After all, it can't do too much harm... right?

-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"

Last edited by Classic30; 03-06-2014 at 10:06 PM.
Classic30 is offline  
Quote Quick Reply Share with Facebook
post #15 of 31 Old 03-06-2014
Dirt Free
 
boatpoker's Avatar
 
Join Date: Jul 2008
Location: Toronto
Posts: 1,157
Thanks: 9
Thanked 31 Times in 30 Posts
Rep Power: 7
 
Re: Zincs

Quote:
Originally Posted by Classic30 View Post
The on-line jury made up of experienced sailors.

Fine.. go for your life. After all, it can't do too much harm, right?
You go with your "on-line" experts. I'll go with ABYC Standards and what I was taught in courses by Ed Sherman, Paul Fleury and Dave Rifkin

All three of these guys are internationally recognized marine corrosion analysis instructors and consultants and Rifkin is a retired nuclear sub commander and consultant to USCG

Dirt People Scare me

Last edited by boatpoker; 03-06-2014 at 10:17 PM.
boatpoker is online now  
Quote Quick Reply Share with Facebook
post #16 of 31 Old 03-07-2014
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 11,039
Thanks: 46
Thanked 224 Times in 209 Posts
Rep Power: 7
   
Re: Zincs

I don't have a position to fight for on bonding. Mine are not bonded (nearly 30 of them!! holy moly)

The question I have is over the standard. Logically, it makes sense to bond a thru hull that may be composed of dissimilar metals. However, are there valves that are solely one metal? If so, what would you be protecting, rather aren't you introducing dissimilar metals by bonding? Finally, from a practical standpoint, I've seen electrically corroded thru hulls, but not very often. Is this standard a logical one, with less practical impact than most?


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

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Minnewaska is offline  
Quote Quick Reply Share with Facebook
post #17 of 31 Old 03-07-2014
Dirt Free
 
boatpoker's Avatar
 
Join Date: Jul 2008
Location: Toronto
Posts: 1,157
Thanks: 9
Thanked 31 Times in 30 Posts
Rep Power: 7
 
Re: Zincs

Quote:
Originally Posted by Minnewaska View Post
I don't have a position to fight for on bonding. Mine are not bonded (nearly 30 of them!! holy moly)

The question I have is over the standard. Logically, it makes sense to bond a thru hull that may be composed of dissimilar metals. However, are there valves that are solely one metal? If so, what would you be protecting, rather aren't you introducing dissimilar metals by bonding? Finally, from a practical standpoint, I've seen electrically corroded thru hulls, but not very often. Is this standard a logical one, with less practical impact than most?
Since all metals have a natural voltage potential, bonding them equalizes those potentials. if all potentials are equal no current can flow therefore no galvanic reaction.

Bonding does not protect you from stray current corrosion which is another form of electrolytic corrosion that involves leaking current from bad connections usually in a wet bilge/bilge pump or even old style battery chargers or water heaters on vessels with AC/DC bonds but that is an entirely different topic.

Dirt People Scare me

Last edited by boatpoker; 03-07-2014 at 08:11 AM.
boatpoker is online now  
Quote Quick Reply Share with Facebook
post #18 of 31 Old 03-07-2014
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 11,039
Thanks: 46
Thanked 224 Times in 209 Posts
Rep Power: 7
   
Re: Zincs

Quote:
Originally Posted by boatpoker View Post
Since all metals have a natural voltage potential, bonding them equalizes thoses potential. if all potentials are equal no current can flow therefore no galvanic reaction.
Doesn't that also apply, if the thru hull is only one metal? At least, only one metal exposed to the electrolyte (sea water)?


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

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Minnewaska is offline  
Quote Quick Reply Share with Facebook
post #19 of 31 Old 03-07-2014
Dirt Free
 
boatpoker's Avatar
 
Join Date: Jul 2008
Location: Toronto
Posts: 1,157
Thanks: 9
Thanked 31 Times in 30 Posts
Rep Power: 7
 
Re: Zincs

Quote:
Originally Posted by Minnewaska View Post
Doesn't that also apply, if the thru hull is only one metal? At least, only one metal exposed to the electrolyte (sea water)?
If all below the water line metals are the same, then no bonding would be required but I don't know of any throughull/seacock combinations that don't consist of only one metal.

If you did have one consisting of one metal and another of two metals they would likely form a galvanic couple through a high capacitance bottom paint.

Or you could start another war by proposing all Marelon throughulls

Dirt People Scare me
boatpoker is online now  
Quote Quick Reply Share with Facebook
post #20 of 31 Old 03-07-2014
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 11,039
Thanks: 46
Thanked 224 Times in 209 Posts
Rep Power: 7
   
Re: Zincs

No way. I hate marelon.

While I get the science on galvanic corrosion, I'm just trying to get my head around why I just don't see much of it on unbonded thru hulls. Some, for sure.

Ours are unbonded and have a stainless steel ball inside a bronze case. Add salt water and they should disappear. But they haven't. Maybe the potential between the two is small? That can't be it. There is some thing preventing disintegration. I'm curious.


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

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Minnewaska is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
When Are Zincs Needed casey1999 Gear & Maintenance 12 11-27-2013 09:15 PM
Zincs Neicy Gear & Maintenance 7 04-24-2012 08:02 AM
Adequate Zincs F4d3d Gear & Maintenance 13 12-09-2010 03:45 PM
About those Engine Zincs preservedkillick Gear & Maintenance 2 10-27-2008 07:02 PM
Fish Zincs, Pencil Zincs and stray current gcalahan Catalina 0 04-18-2007 08:27 PM

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome