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Old 01-12-2014, 12:42   #16
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Re: Thru Hulls- Should They Be Connected Electrically?

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Originally Posted by svfinlandia View Post
I think that I have to disagree. You are forgetting that your ungrounded thru-hull is still connected to salt water which is a very good conductor!

Al, S/V Finlandia
Not nearly as good a conductor as copper wire!
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Old 01-12-2014, 13:58   #17
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Re: Thru Hulls- Should They Be Connected Electrically?

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Originally Posted by barnakiel View Post
Not bonded here. No corrosion either. Seen and sailed plenty of bonded boats too. No corrosion either ...

b.
Herein lies another thread discussing a solution looking for a problem. Must be what happens when others think too much
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Old 01-12-2014, 23:15   #18
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Re: Thru Hulls- Should They Be Connected Electrically?

the other issue is a pure metal through hull in water with no bond will not corrode.


if the cast has mixtures of metals. even unbounded you have dis similar metals in a circuit, that you can't disconnect. and needs to be bonded to a zinc to save it.


the quality and cheapness of everything made today has to be a concern for this issue. IE I doubt a brass through hull made in china isn't full of other metal as well.


a 30 year old through hull may have lasted 30 years unbonded. a new one might not.


same issue for engines when you have shafts / props / engine blocks etc all connected but different metals.
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Old 02-12-2014, 07:02   #19
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Re: Thru Hulls- Should They Be Connected Electrically?

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Originally Posted by smac999 View Post
the other issue is a pure metal through hull in water with no bond will not corrode.


if the cast has mixtures of metals. even unbounded you have dis similar metals in a circuit, that you can't disconnect. and needs to be bonded to a zinc to save it.


s.
For fear of resurrecting a thread about a questionable problem, I need to ask - from where do you get this?

As you don't use the correct term 'alloy', I presume it is intuitive chemistry.
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