#corroding__corrosion__erosion  erosion by chemical action
  supertype:  #chemical_process__chemical_change__chemical_action  any process determined by the atomic and molecular composition and structure of the substances involved
  subtype:  #pitting__roughnes  the formation of small pits in a surface as a consequence of corrosion
  subtype:  #rusting__rust  the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water

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