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The hydrogen evolution mechanism of wet corrosion occurs in

  • A.neutral solutions containing dissolved oxygen
  • B.strongly alkaline solutions only
  • C.dry air at elevated temperature
  • D.acidic solutions free of dissolved oxygen

Answer: D

The cathodic reaction is the reduction of hydrogen ions to hydrogen gas, which requires a supply of them and no better electron acceptor present. The whole surface tends to be attacked uniformly, so the corrosion is general rather than localised.

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