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Help - Boat Corrosion at Drain Plug
Posted on 7/20/23 at 9:43 pm
Posted on 7/20/23 at 9:43 pm
My drain plug fixture broke almost in half. Most of that white in the pic is prob 3M 5200 or the like. It is an aluminum boat. Do I need a sacrificial anode other than what is on my outboard?
This post was edited on 7/20/23 at 9:48 pm
Posted on 7/20/23 at 11:50 pm to CajunSportsman
That looks to be galvanic corrosion (dissimilar metals touching each other). Get one of those orange plastic drain plugs. They are supposedly for emergency use only but I have never had a problem with them. Just replace often.
Posted on 7/21/23 at 4:36 am to CajunSportsman
Yes, looks like galvanic corrosion from dissimilar metals.
Remove, clean up, and have someone weld in an NPT collar, use an aluminum plug.
If that will take too long, remove and put a stainless steel version of the same type of plug.
Do you have bottom paint on this boat?
Remove, clean up, and have someone weld in an NPT collar, use an aluminum plug.
If that will take too long, remove and put a stainless steel version of the same type of plug.
Do you have bottom paint on this boat?
Posted on 7/21/23 at 8:04 am to CajunSportsman
Definitely galvanic corrosion. It’s a little concerning that the plug is corroded and broken though. I would expect the hull to corrode to protect the plug so your plug should be almost perfect. Replace with similar metal.
Magnesium Hull anodes wouldn’t hurt either.
Magnesium Hull anodes wouldn’t hurt either.
This post was edited on 7/21/23 at 8:12 am
Posted on 7/21/23 at 9:41 am to CajunSportsman
my aluminum boat had a similar threaded drain plug machine screw like that. if its completely rotted you'll need to drill it out and re-thread the hole for a larger plug. honestly what i would do is what i did...weld up that hole and put in a bilge pump
Posted on 9/6/23 at 7:31 am to CajunSportsman
It looks like a brass plug, brass plug fixture, stainless screw, and aluminum boat. The issue is probably with the stainless and aluminum.
I’m assuming the boat is stored on a lift or in the water? As in you aren’t removing the plug often?
I’m not sure of the best thing to do with boats stores with the plug in with this situation I’d assume the manufacturer will know? That looks like someone has changed around the factory plug to some degree.
I’m assuming the boat is stored on a lift or in the water? As in you aren’t removing the plug often?
I’m not sure of the best thing to do with boats stores with the plug in with this situation I’d assume the manufacturer will know? That looks like someone has changed around the factory plug to some degree.
Posted on 9/6/23 at 8:11 am to CajunSportsman
Galvanic corrosion, remove, clean & have a piece of Al tubing welded for garboard drain. Using three dissimilar metals wasn’t a smart idea.
Posted on 9/7/23 at 12:08 pm to CajunSportsman
Do you have a battery disconnect switch? You might have stray current running through the hull. You can check with a multi-meter. Put positive on an unpainted part of the boat and the negative on the negative battery post and see if you have any voltage. If so, get a disconnect switch.
Posted on 9/8/23 at 11:14 am to CajunSportsman
As long as you have dissimilar metals, you’ll have galvanic corrosion. I’d go with a traditional/old school expandable rubber plug (or else the threaded plug shown previously). Other option is to keep all your dissimilar metals painted/coated, so the water/electrolyte can’t enable the corrosion.
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