aluminium corrosion in boats

[cahoona]

Starting to get a bit of corrosion in the boat has anyone got ideas how to deal with it .
and what is a good etching primer to get
cheers
Allan :a_goodjob:

[hornet]

I would get a multimeter and check what current may be passing through the hull first, you may have a current leak.
Then check if you have dissimilar metals touching each other in the corrosion area that should have had fibre washers fitted to separate the metals.

[re-tyred]

There should be no connection from the negative battery to the hull. Common source of a connection is a AM/FM/cd player. Most have their negative connected to the chassis. Same for UHF radios. Use a multi meter set on Ohms and go between negative and the hull. Should be open circuit. If it isn't unplug all electronics and test again. If you have an item of equipment that is the trouble, mount it onto plastic and then screw the plastic to the hull. Any other metal do as Hornet says.

[Marty.A]

I'm not a boat owner but I noticed that a friend of mine has installed aluminium anodes to his boat to prevent corrosion do these work or are the methods explained above they way to go, I'm just curious.

[4liters]

Yeah, they work: https://en.wikipedia.org/wiki/Galvanic_anode
Not sure if aluminium anodes would protect an aluminium hull though

[Marty.A]

Yeah, they work: https://en.wikipedia.org/wiki/Galvanic_anode
Not sure if aluminium anodes would protect an aluminium hull though

Thanks for that link mate I might have been mistaken about the aluminium bit but I do know he said they were "sacrificial anodes " to prevent corrosion
and that the corrosion primarily affects aluminium boats exposed to salt water use.
Cheers

[4liters]

I assume this is correct

http://www.boatingmag.com/how-to/choosi ... cial-anode

[re-tyred]

Anodes are to protect your vessel while it is in the water. They help protect against corrosion from other metals on vessels and shore facilities. They have little effect on electrical problems, on your vessel, that cause corrosion. All your electrics need to be isolated from the hull of your vessel.

[cahoona]

hi guys thanks for the replys how do you test with a multi meter all i know is how to ch :a_goodjob: eck the batterys

[Brett]

There should be no connection from the negative battery to the hull. Common source of a connection is a AM/FM/cd player. Most have their negative connected to the chassis. Same for UHF radios. Use a multi meter set on Ohms and go between negative and the hull. Should be open circuit. If it isn't unplug all electronics and test again. If you have an item of equipment that is the trouble, mount it onto plastic and then screw the plastic to the hull. Any other metal do as Hornet says.