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Underdosing an anodic inhibitor is dangerous because it produces

  • A.a large anode against a small cathode
  • B.uniform attack over the whole surface
  • C.a completely passive and protected surface
  • D.a small anode against a large cathode

Answer: D

The unfilmed patches carry the entire corrosion current from the filmed remainder, so penetration at those points is far faster than with no inhibitor present. Cathodic inhibitors are safer in this respect, since underdosing merely reduces the benefit.

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