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I have an aluminum boat, at one time I had a wood floor in it attached with stainless screws to the ribs. I took it out to replace it with an aluminum one and noticed the holes were showing corrosion around them. Since then my deck where it's attached to the bow, the welds are cracking. There are a few other places where it's been drilled through that are showing corrosion.

Question is what can I do to stop it? Slow it down, and/or fix what's already damaged, or is the damage done and will get worse? How do sacrificial annodes work and is that the answer?

I'll appreciate any help. Thanks, chris. :confused:
 

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I think the aluminum in your boat was acting as an anode for the SS bolts. Rule of thumb is to never missmatch metals because one will become the sacrificial anode for the other. If you can find them use aluminum bolts othewise get some that are coated so the metal in them is isolated from the aluminum of the boat. I don't have any actual experience with this but from what I know about metals and corrosion that sounds like your problem.
 
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