Best way to repair corrosion on aluminum boat

[Aavalos3]

I’m in the process of restoring this old alumacraft aluminum boat and I just removed the outboard and discovered a 2.5 inch corroded hole that was behind it on the transom. I cleaned up the area and the wood inside seems fine with no rotting but there seems to be a white layer of some crumbly material that I’m not sure what it is. What would be the best way to repair something like this? Thanks I’m advance.

 

[Scott Danforth]

does it look like the transom was replaced with treated lumber?

Treated lumber will eat aluminum like that

best way is to remove all the rivets, get a sheet of the original thickness (12 gauge) 5052 sheet and make a new transom

 

[AverageJoe72]

does it look like the transom was replaced with treated lumber?

Treated lumber will eat aluminum like that

best way is to remove all the rivets, get a sheet of the original thickness (12 gauge) 5052 sheet and make a new transom

What about treated lumber that has been varnished? How long does it take before that aluminum would get eaten away? I'm asking for a friend...

 

[havoc_squad]

What about treated lumber that has been varnished? How long does it take before that aluminum would get eaten away? I'm asking for a friend...

Just tell that friend that putting today's copper embedded treated lumber in an aluminum boat is like grafting cancerous skin cells on a person's skin.

If they don't want the consequences like that photo to keep happening, better operate immediately and repair/replace it right.

 

[Scott Danforth]

What about treated lumber that has been varnished? How long does it take before that aluminum would get eaten away? I'm asking for a friend...

no treated lumber anywhere near aluminum. you may as well shoot the boat with a 12 gauge and 00 buckshot

you will see the aluminum starting to galvanicaly corrode within a few days if there is any moisture

 

[Lectro88]

no treated lumber anywhere near aluminum. you may as well shoot the boat with a 12 gauge and 00 buckshot

you will see the aluminum starting to galvanicaly corrode within a few days if there is any moisture

Now Scott...
I'm not sure everyone will understand your Analogy.
Or understand what 00 buck will do, or is capable of. (to a boat or anything else)

could you maybe spell it out for the sheltered or slow group.

*and if that didn't tip the grumpy scale* {I have others}

(i think you know, i'm just picking)but I had to have a little fun with that.

 

[Lectro88]

crumbly material that I’m not sure what it is.

That white crumbly material is Aluminum Oxidation or
the Rust "equivalent" for aluminum.

Scott and the others have the rest of it handled for answers.
and good advice to boot.

 

[Scott Danforth]

Now Scott...
I'm not sure everyone will understand your Analogy.
Or understand what 00 buck will do, or is capable of. (to a boat or anything else)

could you maybe spell it out for the sheltered or slow group.

*and if that didn't tip the grumpy scale* {I have others}

(i think you know, i'm just picking)but I had to have a little fun with that.

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