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<p>[QUOTE="-jeffB, post: 3094948, member: 27832"]Same thing, worth face value, but harder to spend now because it's underweight. Something poked through the copper coating, and the zinc core started to dissolve away.</p><p><br /></p><p>Boat makers learned long ago that a steel hull lasts longer if you attach zinc bars to the the <i>outside</i> of the hull. Sheet-metal manufacturers learned that coating steel with zinc protected it from corrosion. It's called "galvanic protection".</p><p><br /></p><p>The zinc lobby learned more recently that you can convince legislators to put copper on the <i>outside</i> and zinc on the <i>inside</i> of a cent. The first hint of damage causes the cent to start dissolving, meaning it will need to be replaced with a new one. It's called "zinc industry protection".[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 3094948, member: 27832"]Same thing, worth face value, but harder to spend now because it's underweight. Something poked through the copper coating, and the zinc core started to dissolve away. Boat makers learned long ago that a steel hull lasts longer if you attach zinc bars to the the [I]outside[/I] of the hull. Sheet-metal manufacturers learned that coating steel with zinc protected it from corrosion. It's called "galvanic protection". The zinc lobby learned more recently that you can convince legislators to put copper on the [I]outside[/I] and zinc on the [I]inside[/I] of a cent. The first hint of damage causes the cent to start dissolving, meaning it will need to be replaced with a new one. It's called "zinc industry protection".[/QUOTE]
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