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-   -   Zinc,...where does it go? (http://www.sailnet.com/forums/gear-maintenance/94068-zinc-where-does-go.html)

ncapener 11-13-2012 07:00 PM

Zinc,...where does it go?
 
I have a steel boat with several zincs attached. I know why they are there, but as the zinc anodes get smaller, where does the metal go?
Same with steel dock pilings protected with zincs.
Is there something in the water that gets zinc plated?

Just curious,

Neal

Ulladh 11-13-2012 07:25 PM

Re: Zinc,...where does it go?
 
Some chemist will probably answer better than me but;

The water is an electrolite, zinc is a less noble metal than your prop or hull, the zinc is electricaly connected to the hull or prop. The electrolite completes a circuit between the dissimilar metals zinc to steel hull or bronze prop, and the zinc becomes an anode to the more noble metal cathode. Material is lost from the anode to the electrolite and increases by some miniscule amount the zinc in surrounding water.

Galvanic corrosion is greater in salt water but is also present in fresh water.

RobGallagher 11-13-2012 08:49 PM

Re: Zinc,...where does it go?
 
Turns to gold and sinks into a chest buried in the mud under your keel. Get an eye patch, draw a map with an X, start carrying a cutlass in ye belt.

arg.

MarkSF 11-13-2012 09:14 PM

Re: Zinc,...where does it go?
 
Surely if gets oxidised, turning to zinc oxide. This is preferable to the other metals turning to oxide. So there is some zinc oxide in the water. Nasty stuff, btw

ReefMagnet 11-13-2012 11:42 PM

Re: Zinc,...where does it go?
 
Quote:

Originally Posted by MarkSF (Post 947995)
Surely if gets oxidised, turning to zinc oxide. This is preferable to the other metals turning to oxide. So there is some zinc oxide in the water. Nasty stuff, btw

I hope not it's a principle ingredient of sun screens!

MarkSF 11-14-2012 12:08 AM

Re: Zinc,...where does it go?
 
Oh right seems that it's only zinc oxide fumes from welding that are toxic. Powder is ok.

blutoyz 11-14-2012 08:23 AM

Re: Zinc,...where does it go?
 
Quote:

Originally Posted by RobGallagher (Post 947973)
Turns to gold and sinks into a chest buried in the mud under your keel. Get an eye patch, draw a map with an X, start carrying a cutlass in ye belt.

arg.

Don't ye be makin' fun o' pirates...that is the reason I bought me boat

capttb 11-14-2012 11:08 AM

Re: Zinc,...where does it go?
 
Quote:

Don't ye be makin' fun o' pirates...that is the reason I bought me boat
Pirates don't BUY boats, that's what makes them pirates.:D

ncapener 11-14-2012 11:34 AM

Re: Zinc,...where does it go?
 
Discounting the pirate theory....the zinc ends up in the water.
My theory was, like in electrolytic plating, the zinc migrates to some other metal body and coats that with a thin film of zinc.

Looks like I owe some beer.

Neal

MarkSF 11-14-2012 12:53 PM

Re: Zinc,...where does it go?
 
Everything you never wanted to know :



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