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<p>[QUOTE=&quot;alurid, post: 3701608, member: 81991&quot;]Thank you for this information and the work you put into it to give others a better understanding of the science. </p><p>I find it quite interesting that the zinc coins do not acquire work hardening during the striking. The Rockwell test show a negative strain hardening.</p><p>To me that indicates a zinc planchet actually gets softer when struck into a coin. </p><p>This must be a factor in why the 99.08% pure zinc is so reactive when exposed to the environment. But then zinc is used in the galvanization process as a corrosion resistant coating on steel implements and structures.[/QUOTE]</p><p><br /></p>

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