Investigation of aqueous slurry erosion-corrosion behaviour of Tantalum in different pH solutions

CHOUHAN, Jitendra, PURANDARE, Yashodhan, JANA, Buddhadev, DEY, A., HOVSEPIAN, Papken, JENKINS, D. and JONES, L. (2023). Investigation of aqueous slurry erosion-corrosion behaviour of Tantalum in different pH solutions. International Journal of Refractory Metals and Hard Materials, 117: 106427.

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Erosion-corrosion behaviour of pure Tantalum (Ta) was investigated using corrosive slurry solutions (pH 4, 7, and 10) containing 7 wt% SiC as erodent particles. Tests were carried out using an impinging jet erosion-corrosion apparatus with a jet velocity of 5 ms−1 and at two impact angles (30° and 90°). Under particle bombardment conditions, a marked reduction in corrosion resistance offered by Ta was observed amid a significant cathodic shift in the ECorr values for all pH values investigated. Results showed that interaction between erosion and corrosion was higher under 30° impact leading to a higher rate of material removal. On the contrary, negative synergism was observed for experimental conditions of normal impact for pH 7 and pH 10. Scanning electron microscopy studies revealed typical ductile erosion mechanisms of material removal which consisted of dominating micro-cutting for 30° and plastic deformation resulting in lip formation for normal impact angle. These appeared to be assisted by dissolution of weakened areas and passive layer removal as corrosion mechanisms. Potentiostatic erosion-corrosion experiments were utilised for calculation of synergistic and antagonistic effects and have been presented in the paper.

Item Type: Article
Uncontrolled Keywords: 0912 Materials Engineering; Materials; 4016 Materials engineering
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SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 23 Oct 2023 12:09
Last Modified: 23 Oct 2023 12:15

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