Email this article Corrosion studies of the Ti50.0Ni50.0 martensitic alloy in different structural states by the gravimetric method
- Authors: Churakova A.A.1,2, Kayumova E.M.2,3
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Affiliations:
- Institute of Molecule and Crystal Physics, subdivision of the Ufa Federal Research Center of the Russian Academy of Sciences
- Ufa State Aviation Technical University
- Ufa State Petroleum Technological University
- Issue: Vol 16, No 1 (2023)
- Pages: 48-57
- Section: Nanomaterials
- URL: https://journals.eco-vector.com/1993-8578/article/view/626958
- DOI: https://doi.org/10.22184/1993-8578.2023.16.1.48.57
- ID: 626958
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Abstract
The paper considers the corrosion behavior of the Ti50.0Ni50.0 martensitic alloy in coarse-grained and ultrafine-grained states in various solutions. In the coarse-grained state, no significant corrosion damage is observed; corrosion products are clearly visible in a dark field taken with an inverted microscope. In the ultrafine-grained state, significant corrosion damage is observed in the form of pitting which size is several micrometers. X-ray phase analysis of the Ti50.0Ni50.0 alloy made it possible to determine the presence of a high proportion (more than 70%) of TiNiH1.4 hydride in the ultrafine-grained state after corrosion tests while the proportion of hydride in the coarse-grained state is less than 2%. The TiNi alloy contains the Ti2Ni phase enriched with Ti, both in the coarse-grained and ultrafine-grained states. Moreover, in the ultrafine-grained state its share is 6 times higher. In addition, 5.3% of the Ti3Ni3Ox phase is observed in the ultrafine-grained state, while this phase was not found in the coarse-grained state. There is also a phase redistribution of the TiNi matrix in the ultrafine-grained state.
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About the authors
A. A. Churakova
Institute of Molecule and Crystal Physics, subdivision of the Ufa Federal Research Center of the Russian Academy of Sciences; Ufa State Aviation Technical University
Author for correspondence.
Email: churakovaa_a@mail.ru
ORCID iD: 0000-0001-9867-6997
Cand. of Sci. (Physics and Mathematics), Researcher
Russian Federation, Ufa; UfaE. M. Kayumova
Ufa State Aviation Technical University; Ufa State Petroleum Technological University
Email: churakovaa_a@mail.ru
ORCID iD: 0000-0001-9636-9184
Postgraduate, Laboratory Assistant
Russian Federation, Ufa; UfaReferences
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Supplementary files
Supplementary Files
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Fig.1. Microstructure of the Ti50.0Ni50.0 alloy in the hardened state (OM). Image (b) shows a selected area at high magnification, the arrow marks the martensitic relief
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Fig.2. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 1M H2SO4 solution in the coarse-grained state
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Fig.3. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 1 M HCl solution in the coarse-grained state
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Fig.4. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 3% NaCl solution in the coarse-grained state
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Fig.5. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 3M HCl solution in the coarse-grained state
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Fig.6. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 3M H2SO4 solution in the coarse-grained state
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Fig.7. Photographs of the structure of Ti50.0Ni50.0 alloy samples before corrosion tests in the ultrafine-grained state
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Fig.8. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 1M H2SO4 solution in the ultrafine-grained state
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Fig.9. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 1M HCl solution in the ultrafine-grained state
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Fig.10. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 3% NaCl solution in the ultrafine-grained state
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Fig.11. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 3M HCl solution in the ultrafine-grained state
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Fig.12. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope in a 3M H2SO4 solution in the ultrafine-grained state
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Fig.13. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained using an optical microscope (a-d) and an inverted microscope (e-h) in a NaCl + H2SO4 solution in the coarse-grained (a, b, e, f) and ultrafine-grained states (c, d, g, h) after exposure for 30 days
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Fig.14. Photographs of the surface of Ti50.0Ni50.0 alloy samples obtained by a scanning electron microscope in a NaCl + H2SO4 solution in the coarse-grained (a, b) and ultrafine-grained (c, d) states
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Fig.15. X-ray patterns of Ti50.0Ni50.0 alloy samples after corrosion tests in the NaCl+H2SO4 solution
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