Corrosion in boat floor.

**riverrat8991** · 02-07-2022, 02:22 PM

Started prepping my boat to paint and what not and noticed some spots in the floor with pink powder and other areas that look like bubbles. Several areas I pushed a screwdriver threw the bubbles areas are powder in the middle. I always flushed the hell out My boat after use in salt and nothing is grounded to the hull. I did have hydro turf down but removed it last spring and didn’t notice any then until yesterday cleaning old glue residue.just kinda puzzled what would of caused it to do so still. Any ideas?

**Saltydog235** · 02-07-2022, 03:13 PM

Any steel screws through the aluminum? Galvanic corrosion is real, got an $80K standing seam roof to replace because of it for a client.

**riverrat8991** · 02-07-2022, 08:39 PM

Originally Posted by Saltydog235

Any steel screws through the aluminum? Galvanic corrosion is real, got an $80K standing seam roof to replace because of it for a client.

no just riveted down. It’s pretty spotty all over the floor.

**DRDUCK** · 02-07-2022, 09:05 PM

Galvanic corrosion, Trust Me

**riverrat8991** · 02-07-2022, 09:17 PM

Originally Posted by DRDUCK

Galvanic corrosion, Trust Me

I get that I’m just puzzled as why it occurred like it did.

**Wing Nut** · 02-08-2022, 10:20 AM

Bad wiring connection somewhere is more than likely the culprit.

**2thDoc** · 02-08-2022, 12:17 PM

listen to the nut
if its the same nut that he used to be.
he can magyver a motor at the whale's tail with a strong NE wind and an outgoing tide with nothing but a shoelace and a gum wrapper.

**riverrat8991** · 02-08-2022, 01:15 PM

Originally Posted by Wing Nut

Bad wiring connection somewhere is more than likely the culprit.

Non of the wiring runs threw the floor think it still may be?

**turbo** · 02-08-2022, 01:20 PM

Originally Posted by riverrat8991

Non of the wiring runs threw the floor think it still may be?

Do you have any trouble with battery drain.

If so, I know where the problem is...

**Chessbay** · 02-08-2022, 01:23 PM

Galvanic corrosion is pretty obvious in that most of the time the dissimilar metals are both pretty apparent.

I bet you have a bad wire somewhere.

What kind of boat is it?

**centurian** · 02-08-2022, 01:57 PM

galvanic corrosion. It can be pretty sneaky to. Sacrificial anodes can help.

**Wing Nut** · 02-08-2022, 02:00 PM

All it takes is one wire to be stripped a little too far allowing current to flow out through the aluminum boat (great conductor) or thin wire sheathing every splice should be heat shrinked and the whole wiring harness run in a sheath if possible even if its spiral wrapped with electric tape. Most flooring from the factory is of softer alloy.

**centurian** · 02-08-2022, 02:15 PM

good read on corrosion https://www.bestboatreport.com/can-y...-in-saltwater/

**mud ugh** · 02-08-2022, 03:38 PM

Pressure treated bunks on the trailer or used as flooring? I’ve seen that eat up an aluminum boat too.

**Wing Nut** · 02-08-2022, 04:58 PM

When you install an anode a standoff bracket would be a good idea also don't use pure zinc anodes try something like Navalloy Anodes and size does make a difference.
You may find it better to put some lip stick on it if the damage is extensive and let someone else deal with it.

**riverrat8991** · 02-08-2022, 05:26 PM

Originally Posted by turbo

Do you have any trouble with battery drain.

If so, I know where the problem is...

No batteries have been fine.

**riverrat8991** · 02-08-2022, 05:27 PM

Originally Posted by Wing Nut

When you install an anode a standoff bracket would be a good idea also don't use pure zinc anodes try something like Navalloy Anodes and size does make a difference.
You may find it better to put some lip stick on it if the damage is extensive and let someone else deal with it.

Haha yeah. I’ve just noticed it in the false floor and have expected everywhere I can and haven’t seen any.

**riverrat8991** · 02-15-2022, 07:15 PM

Little update with it. Found the foam they used had a backing on the top and bottom. Started breaking down and clumping up stopping water from draining and the foam was soaked. Tore up the affected areas just got to figure out how im going to redo it. Hopefully under the gun box is fine seem the foam that way is dry and the opposite side was as well cutting that out and the back bench to get the rest would be a pain.. Also how the boat was designed had a huge flaw anyways ran the foam all the way back to the transom on one side with a tiny gap making it where it was restricted draining into the bildge area plus any trash and it’s stopped up.