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Argon Shrouded Plasma Spraying of Tantalum over Titanium for Corrosion Protection in Fluorinated Nitric Acid Media

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Abstract

Argon shrouded plasma spraying (ASPS) was used to deposit a Ta coating on commercially pure Ti (CP-Ti) under inert argon, for dissolver vessel application in the aqueous spent fuels reprocessing plant with high plutonium content. Oxidation during plasma spraying was minimized by shrouding argon system. Porosity and oxide content were controlled by optimizing the spraying parameters, to obtain a uniform and dense Ta coating. The Ta particle temperature and velocity were optimized by judiciously controlling the spray parameters, using a spray diagnostic charge-coupled device camera. The corrosion resistance of the Ta coatings developed by ASPS was investigated by electrochemical studies in 11.5 M HNO3 and 11.5 M HNO3 + 0.05 M NaF. Similarly, the durability of the ASPS Ta coating/substrate was evaluated as per ASTM A262 Practice-C test in boiling nitric acid and fluorinated nitric acid for 240 h. The ASPS Ta coating exhibited higher corrosion resistance than the CP-Ti substrate, as evident from electrochemical studies, and low corrosion rate with excellent coating stability in boiling nitric, and fluorinated nitric acid. The results of the present study revealed that tantalum coating by ASPS is a promising strategy for improving the corrosion resistance in the highly corrosive reprocessing environment.

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Acknowledgments

The authors are grateful to Dr. G. Amarendra, Director, Metallurgy and Materials Group for his constant support and encouragement throughout this work. The authors acknowledge Mr. Yogesh Kumar, Avinash Kumar, and P.U. Jalendiran of CSTD, IGCAR for their technical support in the experimental work.

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Authors and Affiliations

  1. Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    E. Vetrivendan, J. Jayaraj, S. Ningshen & C. Mallika

  2. Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    U. Kamachi Mudali

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  1. E. Vetrivendan
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  2. J. Jayaraj
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  3. S. Ningshen
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  4. C. Mallika
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  5. U. Kamachi Mudali
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Correspondence to S. Ningshen.

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Vetrivendan, E., Jayaraj, J., Ningshen, S. et al. Argon Shrouded Plasma Spraying of Tantalum over Titanium for Corrosion Protection in Fluorinated Nitric Acid Media. J Therm Spray Tech 27, 512–523 (2018). https://doi.org/10.1007/s11666-017-0678-7

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  • DOI: https://doi.org/10.1007/s11666-017-0678-7

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