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An anodic inhibitor works by

  • A.displacing the metal ions from the solution
  • B.forming a film over the anodic areas
  • C.consuming the dissolved oxygen in the water
  • D.raising the electrical resistance of the electrolyte

Answer: B

Chromates, phosphates and nitrites blanket the anodic sites and stifle the metal dissolution. An insufficient dose is worse than none at all, because it leaves small unfilmed anodes surrounded by a large cathode and provokes intense pitting.

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