Copper Sulfate, Calcium Chloride, Aluminium, what happened?

I was recently massing some copper sulfate penthydrate in disposable
aluminum foil "cupcake tins". By accident, I used a "tin" that had been
previously used to mass some CaCl2. When I began putting the copper
sulfate into the tin, I heard a sizzling sound. I soon noticed that the
aluminium cupcake tin was being dissolved as holes began to form in
areas were crevices concealed some hidden, hydrated CaCl2. My poor lab
practice aside, why did this happen? I understand that the Al will
replace the Cu in either copper sulfate or the formed copper chloride
(with calcium sulfate as a precipitate), but why is the replacement
reaction apparently so much more vigorous with copper chloride? Thanks
for any constructive help...

-Dan Akers

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