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Studies on Hot Corrosion Behaviour of Uncoated and WC-Co+70% NiCrBSi Coated Ti-31

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Abstract:

Alloy-based turbine components operate under extremely high temperatures and corrosive conditions, which often lead to surface degradation and material deterioration. To enhance their durability, these components are typically protected by cermet coatings that act as a barrier against harsh operating environments. This study investigates the influence of carbide alloy powder coating (WC-Co + 70% NiCrBSi) on Ti-31 special alloy and evaluates its effectiveness in resisting hot corrosion. Both uncoated Ti-31 and WC-Co + 70 wt.% NiCrBSi coated Ti-31 specimens were subjected to hot corrosion testing in a molten salt (Na2SO4 + 60% V2O5) environment. Thermogravimetric analysis showed that the cumulative weight gain per unit area for the coated Ti-31 sample decreased by 94.6% compared to the uncoated sample. Microstructural examinations using SEM/EDS and XRD confirmed that the oxide scale formed on the coated specimen was protective in nature, effectively preventing the penetration of corrosive reaction products into the substrate.

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Periodical:

Solid State Phenomena (Volume 394)

Pages:

73-83

DOI:

https://doi.org/10.4028/p-4IrplD

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Online since:

June 2026

Authors:

M. S. Vinod Kumar*, R. Sureshr, N. Jegadeeswaran

Keywords:

Cermets, Hot Corrosion, Salt Environment, Superalloys, Thermal Spray Coating, Thermogravimetric Study, Ti-31, Turbine Blades

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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