Using zink to prevent electrolisis?

[robse]

Hi guys.
When my sub gets wet, the different metal parts starts to corrode, even the stainless steel prop shaft.
Has any of you tried to put a piece of zink in or on the hull?
I'm thinking to put a sheet of zink, and connect it to the ground connection(s) in the sub. It works on my stepdad's boat, so maybe it will do the trick for us too? I have no positive power exposed to water, only ground, but still things gets eaten..

[Rogue Sub]

Works on the real thing!

Works on the real thing! I say do it and give us some real data.

[Guest]

Yes ,do it it works

Yes ,do it it works especialy if you run alot in a pool,clorine does a number on metals and rubber.Coat the rubber parts with silicone grease.
All my subs have a small piece of zink amid ships and corrotion is gone but check on the zink once in a while as it disapears.

Dave Amur Ship yard

[robse]

Aqua: Perfect. http://www.subcommittee.com/forum/icon_smile.gif Do you

Aqua: Perfect. Do you connect the zink to the ground in your subs, or has the zink no electrical connection?

[Guest]

Yes depending on the sub

Yes depending on the sub it is connected to any grounds and sealed with silicone to prevent any corrotion from running up the wire and by the way use marine grade wire its made to withstand seveer conditions and in my opinion is a must and does not cost much more.

Dave

[robse]

Thanks a lot http://www.subcommittee.com/forum/icon_smile.gif I'll

Thanks a lot I'll put a piece in, and post an image when I'm done.

[noney]

Re: Using zink to prevent electrolisis?

Hi guys.
When my sub gets wet, the different metal parts starts to corrode, even the stainless steel prop shaft.
Has any of you tried to put a piece of zink in or on the hull?
I'm thinking to put a sheet of zink, and connect it to the ground connection(s) in the sub. It works on my stepdad's boat, so maybe it will do the trick for us too? I have no positive power exposed to water, only ground, but still things gets eaten..

Hi Dave,
I was particularly interested by your statement that even your stainless steel prop shaft corrodes. There are serveral types of stainless steel corrosion; ie. pitting, crevice, stress. Each has somewhat different conditions, but one type could be particularly interesting to people operating in swimming pools, and that is "Stress Corrosion Cracking" or SCC. It occurs in relative warm chlorinated water ( higher chlorine concentrations than drinking water) when the stainless steel is subjected to a wet and dry environment. I would think that adding zinc will ameliorate most all the types of stainless steel corrosion along with the other metals, but rinsing off your submarine with fresh water after it has been operated in the pool will also help. I would be very interested in how and where you place the zinc on your sub.

Gene

[Guest]

On my five ft Alfa

On my five ft Alfa there is about a once of zink plate that I got from a marine store and glued it down on the keel along side where there are 2 negative connections about a mid ships ,I then drilled a hole in the plate and screwed on a pinch connector and then a marine grade wire to the 2 ground wires,sealed the connections with GOOP and it has worked ,but slowly the plate is disapearing and will be replaced some time in the future.

I run only in ponds especialy with a sub of this size and corotion has been much less since I started installing a zink plate.

Smaller subs I used to run in pools but I found that the seals would fail much too soon and stoped that practice.

[robse]

Hi guys http://www.subcommittee.com/forum/icon_smile.gif

Here's how I

Hi guys

Here's how I got it in there (the zink):

http://www.robse.dk/pages/SSBN/Zink.asp

I'll through in a few images once the zink starts to corrode, so we can see how it workes.

Noney: The steel shaft got black spots, and parts of alu grew white dust.. The black spots could be wiped of though, as I saw it early on.

[Guest]

Has anyone tried fitting EPDM

Has anyone tried fitting EPDM or KALREZ o-ring seals to their boat?

these materials are supposed to be resitant to chlorine, unlike nitrile which is attacked by it.

The seals are a lot more expensive than nitrile ones, but the extra expense may be worth it if you run a lot in swimming pools.

Andy