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<p>In this study, compositionally complex Ti<sub>53.3−x</sub>Nb<sub>10</sub>Zr<sub>10</sub>Ni<sub>10</sub>Co<sub>10</sub>Fe<sub>6.7</sub>B<sub>x</sub> alloys (CCAs) were prepared by vacuum arc melting. The microstructure of the samples was characterized using X-ray diffraction (XRD) and scanning electron microscopy combined with the energy dispersive X-ray analyzer (SEM–EDX). Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) were employed to evaluate the impact of B inclusion on the corrosion performanceof the CCAs. Results implied that the 5.3 at% B alloy demonstrated superior corrosion performance across all tested acidic environments, exhibiting the lowest corrosion current densities and reduced material loss. In HCl, the 5.3 at% B alloy displayed a corrosion rate of 4.0&#xa0;mm/y, which was lower than the B-free alloy (9.3&#xa0;mm/y) and the 10.6 at% B alloy (6.0&#xa0;mm/y). The same behaviour was observed in H<sub>2</sub>SO<sub>4</sub>, where the 5.3 at% B attained a lower degradation rate of 15.5&#xa0;mm/year while the B-free alloy and the 10.6 at% B alloy recorded dissolution rates of ∼ 31&#xa0;mm/y. However, in H<sub>3</sub>PO<sub>4</sub>, the corrosion behavior of the alloys was almost identical. EIS results revealed that the 5.3 at% B alloy exhibited the highest polarization resistance in all media which was attributed to the development of a more stable and protective passive film. The present outcomes demonstrate that the corrosion resistance of the Ti CCA is enhanced by incorporating 5.3 at% B due to its refined and more homogeneous microstructure. Higher B concentration causes microstructural inhomogeneity which diminshes passivation and increases the susceptibility for micro-galvanic corrosion.</p>

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Microstructure and corrosion performance of Ti53.3−xNb10Zr10Ni10Co10Fe6.7Bx compositionally complex alloys in acidic environments

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Aliaa Abdelfatah,
  • Lamiaa Z. Mohamed,
  • Mostafa Alshafey,
  • H. Megahed,
  • Shimaa El-Hadad,
  • Rania E. Hammam

摘要

In this study, compositionally complex Ti53.3−xNb10Zr10Ni10Co10Fe6.7Bx alloys (CCAs) were prepared by vacuum arc melting. The microstructure of the samples was characterized using X-ray diffraction (XRD) and scanning electron microscopy combined with the energy dispersive X-ray analyzer (SEM–EDX). Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) were employed to evaluate the impact of B inclusion on the corrosion performanceof the CCAs. Results implied that the 5.3 at% B alloy demonstrated superior corrosion performance across all tested acidic environments, exhibiting the lowest corrosion current densities and reduced material loss. In HCl, the 5.3 at% B alloy displayed a corrosion rate of 4.0 mm/y, which was lower than the B-free alloy (9.3 mm/y) and the 10.6 at% B alloy (6.0 mm/y). The same behaviour was observed in H2SO4, where the 5.3 at% B attained a lower degradation rate of 15.5 mm/year while the B-free alloy and the 10.6 at% B alloy recorded dissolution rates of ∼ 31 mm/y. However, in H3PO4, the corrosion behavior of the alloys was almost identical. EIS results revealed that the 5.3 at% B alloy exhibited the highest polarization resistance in all media which was attributed to the development of a more stable and protective passive film. The present outcomes demonstrate that the corrosion resistance of the Ti CCA is enhanced by incorporating 5.3 at% B due to its refined and more homogeneous microstructure. Higher B concentration causes microstructural inhomogeneity which diminshes passivation and increases the susceptibility for micro-galvanic corrosion.