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<p>[QUOTE=&quot;-jeffB, post: 1384549, member: 27832&quot;]I was mostly going by the EMF table. Aluminum&#039;s a lot more reactive than even zinc; if not for that oxide coating, it would displace hydrogen from water. Any acidic <i>or</i> basic environment can attack it. We were reminded of this when we discovered that our aluminum baking pans, which we&#039;d been running through the dishwasher, had developed pinholes -- the alkaline detergent attacked them.</p><p><br /></p><p>Nickel&#039;s definitely more active than copper, but again, tends to form a protective oxide coating. Nickel falls above hydrogen in the table, so it can be attacked by even weak hydrochloric acid; not copper (copper needs an oxidizing agent to go into solution). Leave a nickel in vinegar for a few months, and you&#039;ll find it copper-colored, sitting in a greenish-blue bath of nickel acetate.</p><p><br /></p><p>Copper&#039;s more like the rest of the PMs in that it occurs uncombined in the earth&#039;s crust. Not so for iron, nickel, aluminum or zinc -- unless you count meteorites.[/QUOTE]</p><p><br /></p>

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