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Oxidation and hot corrosion attack turbine blades by

  • A.Causing slow permanent extension
  • B.Producing cyclic thermal stress
  • C.Eroding the surface mechanically
  • D.Chemical loss of surface material

Answer: D

The metal reacts with oxygen and with contaminants such as sulphur and salt, losing material steadily. Protective coatings are applied specifically against this, and their loss often ends a blade's life before creep or fatigue would have.

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