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/lp/springer-journals/a-treatise-on-corrosion-science-engineering-and-technology-comparative-0svCJctqDA
- Publisher
- Springer Nature Singapore
- Copyright
- © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2022
- ISBN
- 978-981-16-9301-4
- Pages
- 87 –98
- DOI
- 10.1007/978-981-16-9302-1_5
- Publisher site
- See Chapter on Publisher Site
Abstract
[Titanium (Ti) is used in chemical processing, aerospace industry and nuclear fuel reprocessing applications, as Ti exhibits good resistance to corrosion in wide range of corrosive environments. Titanium exhibits good corrosion resistance in high concentrations of HNO3; however, in hot and pure HNO3 solutions and in vapour condensates of HNO3, Ti exhibits higher corrosion rate. Surface modification was attempted in order to further improve corrosion resistance of Ti in HNO3 medium. Tantalum and niobium exhibit outstanding corrosion resistance in HNO3 over wide range of concentration and temperatures. An indigenously developed Ti-5Ta-1.8Nb alloy exhibited improved corrosion resistance in HNO3 due to the formation of tantalum and niobium-rich passive films. Tantalum- and niobium-based coatings on Ti are therefore considered to enhance the corrosion resistance of Ti in HNO3 environment. A comparative study on coatings deposited by thermochemical diffusion method and argon shrouded plasma spray technique (ASPS) for refractory coatings on titanium was studied. The XRD, SEM, EDS, ASTM A262 Practice-C test and three-phase corrosion test results are compared for the evaluation. The study revealed that Ta2O5 coated and thermally oxidized samples showed good corrosion resistance with reproducibility in comparison with uncoated titanium and Ti-5Ta-1.8Nb alloy in boiling liquid HNO3 medium. Thermal oxidation is envisaged as a viable and economical method to improve corrosion resistance in liquid, vapour and condensate phases of HNO3 for intricate components made of titanium. Tantalum coating deposited on Ti by ASPS technique also showed promising results for application on large components made of titanium.]
Published: May 5, 2022
Keywords: Titanium; Coating; Surface modification; Corrosion; Nitric acid