Also, the rock acts as a buffer and would neutralise the acid, again, stopping the lake getting acidic.
Aluminium requires a strong acid to remove the outer coating, greater than 4 mol/litre. Thus you would need 4 x 50,000,000,000 mols or 10,000,000,000 kg of acid.
We here at the Hollywood Science website don’t really think that the volcano would create such an enormous amount of acid.
Jonathan Hare and Robert Llewellyn gave Dante’s Peak a Hollywood Science rating of 8/10.
However, even though the volcano will indeed make acid, it would not nearly be at a sufficient strength to strip the aluminium from the boat. So we at the Hollywood Science website feel that we can only give it a rating of: 
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