What is Marine Grade Aluminum?

[MikeA57]

I see a lot of the aluminum boat manufacturers talk about their boats being constructed from "Marine Grade Aluminum". How is Marine Grade different from regular old aluminum? Is it a minimum thickness, some treatment done to it, or what?

 

[Jonboat Jerry]

Hey Mike, here is a link I found which may help explain the differences.
https://aluminum.adimetal.com/category/6061-structural-marine-grade-alloy-aluminum