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<p>[QUOTE=&quot;-jeffB, post: 2902899, member: 27832&quot;]This simply isn&#039;t so. Or, at least, it isn&#039;t simply so.</p><p><br /></p><p>Some metals form a coating that protects against further attack. This is called <i>passivation</i>.</p><p><br /></p><p>Aluminum passivates in air, and that&#039;s what makes aluminum foil practical to use. If it didn&#039;t form a protective layer of aluminum oxide, aluminum would be attacked by even <i>pure water</i>, liberating hydrogen and turning into a pile of aluminum oxide.</p><p><br /></p><p>Nickel isn&#039;t as reactive as aluminum, but it does something similar. That&#039;s why it can be used in contact with some highly reactive chemicals, up to and including fluorine gas.</p><p><br /></p><p>I&#039;m on board with &quot;toning is a euphemism for corrosion&quot;, but saying &quot;it&#039;s the same for all metals&quot; is just wrong.[/QUOTE]</p><p><br /></p>

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