Corrosion Under Slag Deposits During Partial Oxidation

Project example high-temperature corrosion
• Damage assessment
• Development of corrosion protection coatings


  • Corrosion of waste heat boiler tubes due to deposits and ashes, which accumulate in the partial oxidation process of heavy oils and are deposited on the colder tube surfaces
  • Heavy oils contain large amounts of sulphur and heavy metal residues, especially vanadates, which lead to increased corrosion attack


  • Long-term tests under conditions close to the application and metallographic characterization of various materials led to a significantly improved understanding of the underlying corrosion process
  • No economically viable, corrosion resistant material could be found
  • Protective coatings and a coating process for the internal coating of pipes and plant components was developed based on laboratory tests and thermodynamic calculations

Customer Benefit

  • Up-scaling of the coating process for internal coating of tubes (of approx. 2 m wide and approx. 8 m high pipe coils)
  • Prevention of corrosion damages and plant downtimes through an effective corrosion protection concept for cost-effective materials
  • Design of experiments and material selection is supported by thermodynamic calculations

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