Microstructural and phase changes in TiNi alloy after electrochemical corrosion tests

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Abstract

In the presented paper the complex studies of microstructure and phase composition of the alloy before and after electrochemical corrosion tests in solutions of 1M HCl, 3M HCl, 1M H2SO4, 3M H2SO4 have been carried out. The studies showed that the corrosion process in the alloy Ti49.1Ni50.9 in the case of electrochemical corrosion took place on all samples and in all solutions in the form of appearance of pittings, as well as with corrosion products when tested in H2SO4 solutions with different concentrations, in the case of 3 M HCl corrosion products were also found on the surface of the samples. A change in microstructure character was found in the coarse grained state in 3 M solutions, while no such change was found 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 University of Science and Technology

Author for correspondence.
Email: churakovaa_a@mail.ru
ORCID iD: 0000-0001-9867-6997

Cand. of Sci. (Physics and Mathematics), Senior Researcher

Russian Federation, Ufa; Ufa

E. I. Iskhakova

Institute of Molecule and Crystal Physics - Subdivision of the Ufa Federal Research Center of the Russian Academy of Sciences; Ufa University of Science and Technology

Email: churakovaa_a@mail.ru
ORCID iD: 0009-0001-0907-6146

Research Assistant

Russian Federation, Ufa; Ufa

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Supplementary files

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2. Fig.1. Optical image of the microstructure of the Ti49.1Ni50.9 alloy in in coarse-grained (a) and ultrafine-grained (b) states

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3. Fig.2. TEM images of microstructure of Ti49.1Ni50.9 alloy in CG state (a, b), UFG state (c, d)

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4. Fig.3. Polarisation curves of Ti49.1Ni50.9 alloy in 1 M HCl solution (a), 3 M HCl solution (b), in 1 M H2SO4 solution (c), 3 M H2SO4 solution (d), blue curve – CG state, red curve – UFG state

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5. Fig.4. Photographs of the surface of alloy samples after electrochemical tests of Ti49.1Ni50.9 alloy in coarse-grained (a, c) and ultrafine-grained (b, d) states in 1 M (a, b) and 3 M H2SO4 (c, d) solutions

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6. Fig.5. Photographs of the surface of alloy samples after electrochemical tests of Ti49.1Ni50.9 alloy in coarse-grained (a, c) and ultrafine-grained (b, d) states in 1 M (a, b) and 3 M HCl (c, d) solutions

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7. Fig.6. TEM images of microstructure of Ti49.1Ni50.9 alloy after corrosion tests in 3 M H2SO4 solution in coarse-grained (a, b) and ultrafine-grained (c, d) states

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8. Fig.7. TEM images of microstructure of Ti49.1Ni50.9 alloy after corrosion tests in 3 M HCl solution in coarse-grained (a, b) and ultrafine-grained (c, d) states. Microstructure area containing particles (e)

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9. Fig.8. X-ray patterns of Ti49.1Ni50.9 alloy after corrosion tests in solutions of 1 M and 3 M H2SO4 and 1 M and 3 M HCl in coarse-grained (a) and ultrafine-grained (b) states

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Copyright (c) 2024 Churakova A.A., Iskhakova E.I.