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A steel tank dosed with a chromate inhibitor develops deep pits where before it corroded evenly. The explanation is

  • A.the inhibitor dose was too low
  • B.the inhibitor dose was too high
  • C.chromate is a cathodic inhibitor
  • D.the tank had been cathodically protected as well

Answer: A

An anodic inhibitor at insufficient concentration films most of the surface but leaves small bare anodes against a large cathode, concentrating the whole current on them. Either dose properly or use a cathodic inhibitor instead.

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