Galvanic Corrision Help

[242XJoshX]

All, I am looking for some help/insight into galvanic corrosion of my 2017 242x. I wet slipped the boat at a marina in Marblehead last season on Lake Erie and when it was pulled all the aluminum had white galvanic corrosion. Can someone let me know if this is normal/par for the course (I don’t think so as other friends do the same with other 242’s and said they have never seen this before) or something is wrong. Wondering if it’s my electrical system, bonding system, anodes, marina (other boats in marina didn’t show degradation of aluminum components), boats around me with bad electrical. Please note this was never connected to shore power.

 

[Murf'n'surf]

Do you have a battery charger hooked all the time?

Some look like barnacle growth to me.

Stray voltage from the dock or a nearby boat can cause excessive galvanic corrosion. Larger anodes could help.

 

[Mainah]

That is not normal for just one season. I would say there is some stray electrical current in the water where you slip or there is stray current in your boat. Could be the marina dock wiring itself, another boat, or something in your boat. In any case bad for the boat and could be very bad for anyone who jumped in the water.

Large anodes near but not attached your boat would help you out (if issue is not in your boat) but still not solve the root cause.

 

[242XJoshX]

No battery charger hooked up all year, except for solar cells that is.

I had the dealership I bought it from install a second bilge pump with oat switch and a Garmin GPS chart plotter.

I put on a set of thrust vectors and lateral thrusters.

Have about 100 boats in marina, no other boats came out with any unusual corrision. I have a feeling something in my boat is not landed correctly but unfortunately everything works as it should so finding it should be fun.

What makes all this worse is when I took it to the dealership at the dealership and said what the heck, the dealership said you should never wetslip a jet boat because that’s what happens, meanwhile some of my friends have 2012’s that have been wetslipped for years with nothing that looks like mine.

 

[242XJoshX]

Mainah, any suggestions or thread that talks about the max size anodes someone has put on a boat?
All, any suggestions on how to treat the corrosion, wire brush?
Lastly, I think I’m going to try to ring all the electrical out to make sure everything is landed correctly, any suggestions, tips/tricks?

 

[Sbrown]

From what I've read, if by chance your anodes are actually magnesium instead of aluminum alloy, they could actually be causing the problem if the water is anything less than clean, clear fresh water.
I think one of the clues here is the fact that your anodes are hardly touched at all. They should be the first thing to go, unless they are either insulated from the aluminum and/or water, or they are causing the problem.