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Dry or chemical corrosion occurs by the direct attack of a gas on a metal in the

  • A.absence of any liquid electrolyte
  • B.presence of an aqueous electrolyte
  • C.presence of a salt bridge between two metals
  • D.absence of oxygen from the surrounding atmosphere

Answer: A

Oxygen, the halogens or hydrogen sulphide react with the metal surface directly, most importantly at high temperature, and no ionic conduction through a solution is involved. Wet corrosion by contrast requires an electrolyte and proceeds through separate anodic and cathodic sites.

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