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<p>[QUOTE=&quot;-jeffB, post: 2999990, member: 27832&quot;]Passivation certainly happens with some metals (and oxidants); that&#039;s why we can boil water in aluminum pots without the water attacking them, and why we can handle fluorine with nickel piping.</p><p><br /></p><p>On the other hand, we have things like bronze disease, which is definitely autocatalytic. If you don&#039;t get rid of it, it&#039;ll spread.</p><p><br /></p><p>I don&#039;t think silver sulfide is autocatalytic, but I&#039;m pretty sure it&#039;s not passivating -- otherwise, there wouldn&#039;t be the worry about toning &quot;progressing to the terminal stage&quot;.</p><p><br /></p><p>I&#039;m still very much in the learning stages, though. (And I hope <i>that</i> never stops!)[/QUOTE]</p><p><br /></p>

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