Plasma Sprayed Ceria Reinforced Alnicocrsi High Entropy Alloy Hydrophobic Coating with Enhanced Corrosion Behaviour

A high entropy alloy (HEA), AlNiCoCrSi, is synthesized, and three distinct compositions of the HEA reinforced with 1 wt% and 2 wt% CeO₂, along with bare HEA, are coated using atmospheric plasma spraying. Corrosion behaviour reveals a decrease in the Icorr value from 3.34 x 10⁻⁵ A/cm² to 1.06 x 10⁻⁵ A/cm² and Vacr from 0.40 mm/year to 0.12 mm/year with increasing CeO₂. The enhanced corrosion resistance is attributed to increased relative density, the hydrophobicity of the coatings (with a water contact angle of 126°), and the role of CeO₂ addition. Post-corrosion analyses confirm the potential of the coatings to mitigate electrolyte-induced corrosion. Possible mechanisms for improvement in these properties are also addressed.

Keywords: High entropy alloy, rare earth Oxide (CeO2), atmospheric plasma spray, Hydrophobicity, Corrosion resistance, Corrosion mechanism

Suggested Citation: Suggested Citation

Gaur, Atirek and Kumar, Rahul and Pandel, U. and Keshri, Anup Kumar and Sharma, Swati, Plasma Sprayed Ceria Reinforced Alnicocrsi High Entropy Alloy Hydrophobic Coating with Enhanced Corrosion Behaviour. Available at SSRN: https://ssrn.com/abstract=5273381 or http://dx.doi.org/10.2139/ssrn.5273381