Argon shrouded plasma spraying of tantalum over titanium for corrosion protection in fluorinated nitric acid media
E Vetrivendan, J Jayaraj, S Ningshen, C Mallika… - Journal of Thermal …, 2018 - Springer
Journal of Thermal Spray Technology, 2018•Springer
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 …
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 …
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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