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Thread: Copper in alloying

  1. #21
    Boolit Master


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    Quote Originally Posted by yeahbub View Post
    The solubility of copper in high percentage tin alloys (95/5 tin/antimony lead-free plumbing solder) is a great reason to not use lead-free plumbing solder on electrical connections. It'll solder great, but where the solder coats the copper, the crosse-sectional area of the wire will be reduced. Eventually, through vibration or movement, the wire will break off where the solder stopped.
    'yeah but' Remember soldering 101.. what we were taught is that solder is not meant to be a mechanical joint.. it's an electrical connection. .. and that's why wires to boards were secured with a drop of glue.. or put in multi strand high density connectors... and then boards are shock mounted usually with insulated nylon or phenolic stand offs.. to prevent that movement and vibration...

  2. #22
    Boolit Grand Master popper's Avatar
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    Copper bonds to antimony in a 1:5 ratio. I don't use tin (1:1 ratio). so .002/.01 will help but .005/.025 is better. It can go to .005/.08, Sb is in excess. I've gone to .02/.05 (WDd) and get BHN equal to superhard ingot. Shot great, not brittle at all but not really needed. And you better size right after casting or PCing.
    Whatever!

  3. #23
    Boolit Master
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    Wikipedia:
    Commercial copper sulfate is usually about 98% pure copper sulfate, and may contain traces of water. Anhydrous copper sulfate is 39.81 percent copper and 60.19 percent sulfate by mass, and in its blue, hydrous form, it is 25.47% copper, 38.47% sulfate (12.82% sulfur) and 36.06% water by mass.
    To get 0.2% Cu into 1 lb of alloy with a minimum of 1% Sb, you would need 14 grains of Cu. There’s 14 grains of Cu inside of 55 grains of blue Root Kill… bump that up to 56.1 grains for the 98% purity.
    *
    The molar mass of Zn is 65.392 g/mol and the molar mass of Cu is 63.546 g/mol. So 14.4 grains of Zn can be exchanged for 14.0 grains of Cu.
    *
    So melt 14.4 grains of Zn wheel weight into 1 lb of alloy, then flux it with 56.1 grains of root kill to get 0.2% Cu in the alloy.
    *
    Does anyone see any errors in that math?

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BP Bronze Point IMR Improved Military Rifle PTD Pointed
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