Copper Nickel, or Cupronickel, is a an alloy of copper and nickel and is highly resistant to corrosion in seawater and is very durable, so it is frequently used in many marine applications such as shafts, propellers, and crankshafts.
Additionally, cupronickel tubing is used in piping and heat exchangers for seawater systems and can also be found as the debasing agent in silver coins.
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