Erosion–corrosion resistance of a β-Ta₂O₅ nanocrystalline coating in two-phase fluid impingement environments

ABSTRACT

In this study, a β-Ta₂O₅ coating was deposited onto a Ti–6Al–4V substrate using a double-cathode glow discharge plasma technique. The hardness and elastic modulus values of the β-Ta₂O₅ coating were almost 4 times and 1.8 times greater than that of the Ti–6Al–4V substrate, respectively. Potentiodynamic polarisation curves indicated that the current densities of the β-Ta₂O₅ coated sample are least one order of magnitude less than that observed for the uncoated substrate under a solid/liquid slurry flow. Electrochemical impedance spectroscopy results showed that the resistance values for the β-Ta₂O₅ coating are of the order of 10⁶ Ω cm², and at the same erosion time, the resistance value for the β-Ta₂O₅ coating is one order of magnitude greater than that of the Ti–6Al–4V.

KEYWORDS:

• Erosion–corrosion
• polarisation
• β-Ta₂O₅ nanocrystalline coating
• EIS
• synergy

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability

The raw/processed data required to reproduce these findings cannot be shared at this time due to legal or ethical reasons.

Additional information

Funding

The authors acknowledge the financial support of the General Program of the National Natural Science Foundation of China under [grant number 51675267], the Key Program of the National Natural Science Foundation of China under [grant number 51635004], the Australian Research Council Discovery Project scheme and Parent Project Muscular Dystrophy (US ).