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Anodic protection is achieved by

  • A.making the metal the anode so that it dissolves evenly
  • B.coating the metal with a more anodic metal
  • C.connecting the metal to a sacrificial magnesium block
  • D.shifting the metal into its passive region

Answer: D

A small anodic current can push a passivating alloy such as stainless steel into the range where its film is stable and the corrosion rate collapses. Applied to a non-passivating metal the same current would accelerate the attack instead.

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