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 language | English |
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Article number | 106006 |
Journal | Tribology International |
Volume | 142 |
Early online date | 9 Oct 2019 |
DOIs | |
Publication status | Published - Feb 2020 |
MoE publication type | A1 Journal article-refereed |
Funding
The financial support for the SUBTRIB project from the Finnish Funding Agency for Technology and Innovation (Business Finland; decision number 865/31/2016 ), participating companies and VTT Technical Research Centre of Finland Ltd is gratefully acknowledged.
Keywords
- Abrasive wear
- Cermet
- Thermally sprayed coating
- Tribocorrosion