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Pitting corrosion is dangerous out of proportion to the metal lost because it

  • A.occurs only in strongly acidic conditions
  • B.perforates the section at a few points
  • C.removes metal uniformly from the whole surface
  • D.affects only the surface appearance

Answer: B

A tank may leak while more than ninety-nine per cent of its wall remains sound, so weight loss measurements badly understate the damage. Once a pit starts, its oxygen-starved base stays anodic and it deepens autocatalytically.

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