I was thinking the same exact thing.
If the pins crumbled off the CPU it's an Intel or AMD problem Sony doesn't make the CPU. It would be pretty crazy if it corroded in a couple of days too! Especially if it was running most of the time; it would be hot and moisture doesn't like to condense on warm things. Copper also won’t rust through; it will form a protective layer of oxidation that will protect the core. How long have you had that laptop? And what the heck would you are you doing with it to cause that amount of corrosion? Unless it took a little swim in the ocean I can’t see this being possible from normal use.