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TOPIC: electrolysis

electrolysis 8 years 6 days ago #88415

  • DaveM
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Hi, aluminum newbie here, just have to ask - has anyone had experience with electrolysis in older aluminum boats? Thanks......

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Re:electrolysis 8 years 6 days ago #88422

I don't have a metal boat, whether it a lumi or steel, but I have seen some damage done, whether it's sitting at the dock or purposely caused by de-rust parts.

A few questions :
Is this a salt water boat ?
Will the boat be in the water year round at a marina ?
Most of the time the damage is caused and accelerated due to electric power leaching into the water. usually at marinas

If you hang a piece of zinc in the water, that will draw all of the damage before anything else.
I'm not a chemist, but what I know is electrolysis requires two metals and a salt bridge. The salt bridge is usually slow,but over long time will do damage. But if you introduce a power source to the salt bridge ?
You can watch the metal disappear.... so to speak ( see the de-rusting of the gas tank thread in the main forum)

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Re:electrolysis 8 years 6 days ago #88425

Aluminum boats (& aluminum fuel cells [esp below decks]) also suffer when water is trapped between 2 surfaces too long w/ no air movement to encourage the water to dry. Water sitting in the drip rails around hatches, water between foam & a fuel tank that wasn't painted 1st, in a folded seam in the hull, between wet wood & aluminum, etc. It does NOT have to be dissimilar metals, although that certainly makes it worse.

In many cases it looks like a flimsy, swiss cheese hole filled mess.

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Re:electrolysis 8 years 14 hours ago #88644

  • DaveM
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To Chuck and JBCurt, thank you for the replies..

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Re:electrolysis 8 years 13 hours ago #88649

Perhaps a bit overboard, but LOTS of corrosion repair going on here:
forums.iboats.com/starcraft-boats/my-first-starcraft-1975-18-supersport-595947.html

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