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Impressed current cathodic protection differs from the sacrificial method in using

  • A.an alternating current supply with two inert anodes
  • B.an external direct current supply and an inert anode
  • C.a more anodic metal consumed in the process
  • D.no anode of any kind in the circuit

Answer: B

A rectifier drives current from a graphite or high-silicon iron anode to the structure, so the anode is barely consumed and the current can be adjusted. It suits long pipelines and large structures where sacrificial anodes would be uneconomic.

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