Tribocorrosion behaviour of thermally sprayed cermet coatings in paper machine environment

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Abstract

Tribocorrosion behaviour of thermally sprayed cermet coatings: WC-CoCr deposited by HVOF and HVAF and Cr3C2-WC-NiCrCo applied by HVAF, was examined in paper machine environment in a pin-on-disc tribometer under the load of 20 N in electrolyte containing chlorides and sulphates, pH 4.5. Wear was the dominant degradation mechanism for all coatings, followed by corrosion-induced wear, the importance of which increased with rising potential. The overall material losses were lowest for HVAF WC-CoCr and highest for HVAF Cr3C2-WC-NiCrCo, the latter being related to the evident abrasive wear of the Cr3C2 phase and cracking along Cr3C2-matrix interface in the near-surface areas. Among the three coatings, contribution by corrosion to the damage was greatest in HVOF WC-CoCr, likely due to high degree of porosity.

Original languageEnglish
Article number106006
JournalTribology International
Volume142
Early online date9 Oct 2019
DOIs
Publication statusPublished - Feb 2020
MoE publication typeA1 Journal article-refereed

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Keywords

  • Abrasive wear
  • Cermet
  • Thermally sprayed coating
  • Tribocorrosion

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