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Treating corrosion pitting in aluminium boats

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Created by keensailor A week ago, 27 Mar 2020
keensailor
NSW, 660 posts
27 Mar 2020 5:09PM
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what is best way to treat and seal the inside of hull where pitting has occurred due to corrosion. Some of the pits have gone right through hull so I will be getting those spot welded. But I would like to treat the other pitting and slow further corrosion down.


stray
SA, 165 posts
27 Mar 2020 4:47PM
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If its an old dinghy its probably not worth fixing.
would need abrasive blast and epoxy etch prime and top coat.
maybe a good clean and fish oil would keep it going for a while.

Ramona
NSW, 5516 posts
27 Mar 2020 5:53PM
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Looks like an old rivetted alloy dinghy probably 60 years old. Don't weld it. I would suggest scrubbing the pitted area with a SS wire brush. Fill the depressions with epoxy and micro balloons and when it goes off, whisking a minigrinder and a sanding disc over it to flatten it off. Any holes glue on a patch with JB weld. Get the alloy really clean first.

keensailor
NSW, 660 posts
27 Mar 2020 9:05PM
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It is a 20 year old 4.6 metre Brooker runabout and is really only pitted like this in a smallish area at rear of boat. This was hidden under the floor as I later discovered. The boat is in pretty good condition with the exception of the small area so I want to try and preserve the boat.

Harb
WA, 173 posts
27 Mar 2020 11:52PM
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I've been using Penetrol on similar pitting on a couple of booms and an old mast and it stopped further corrosion. A light coat of silver spray paint over the cured Penetrol helps with UV protection .

Ramona
NSW, 5516 posts
28 Mar 2020 8:49AM
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Select to expand quote
keensailor said..
It is a 20 year old 4.6 metre Brooker runabout and is really only pitted like this in a smallish area at rear of boat. This was hidden under the floor as I later discovered. The boat is in pretty good condition with the exception of the small area so I want to try and preserve the boat.


Would not weld it still.



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"Treating corrosion pitting in aluminium boats" started by keensailor