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In sacrificial anode protection the anode is a metal

  • A.more anodic than the structure protected
  • B.more cathodic than the structure protected
  • C.of the same composition as the structure
  • D.chosen for its resistance to being consumed

Answer: A

Magnesium, zinc or aluminium corrodes in preference and must be replaced periodically, which is the cost of the method. No external power supply is needed, which is its great convenience for a ship's hull or a small buried tank.

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