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Strange looking 1865 3-cent piece
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<p>[QUOTE="-jeffB, post: 5163300, member: 27832"]I came into the electronics hobby well after the tube era, so the constraint was always "don't cook the semiconductors", which (in those days) didn't like to go much above 250 or so. But copper doesn't melt until almost 2000 F, and nickel above 2600 F. (It doesn't look like they form a eutectic with a lower melting point, either).</p><p><br /></p><p>But my understanding is that solder <i>dissolves</i> some of the copper (and presumably nickel) when you're forming a joint. Remove the solder, and some of that coin will come along, right?</p><p><br /></p><p>I'd guess, though, that acid flux is even more likely. Given that even <i>vinegar</i> will gnaw out the nickel from cupronickel, I'm sure hydrochloric acid/zinc chloride would chow right down on it.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 5163300, member: 27832"]I came into the electronics hobby well after the tube era, so the constraint was always "don't cook the semiconductors", which (in those days) didn't like to go much above 250 or so. But copper doesn't melt until almost 2000 F, and nickel above 2600 F. (It doesn't look like they form a eutectic with a lower melting point, either). But my understanding is that solder [I]dissolves[/I] some of the copper (and presumably nickel) when you're forming a joint. Remove the solder, and some of that coin will come along, right? I'd guess, though, that acid flux is even more likely. Given that even [I]vinegar[/I] will gnaw out the nickel from cupronickel, I'm sure hydrochloric acid/zinc chloride would chow right down on it.[/QUOTE]
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