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<p>TiB<sub>2</sub> and TiB boride layers were formed on Ti-6Al-4V using a molten-salt diffusional process at a temperature of 900&#xa0;°C for 16&#xa0;h. Reciprocating sliding tests in phosphate-buffered saline (PBS) solution were conducted under open circuit potential, potentiodynamic polarization (PP), and potentiostatic (+ 1&#xa0;V vs. Ag/AgCl) conditions for both untreated Ti-6Al-4V and borided samples under normal loads of 0.5&#xa0;N, 1&#xa0;N, 5&#xa0;N, and 15&#xa0;N against an alumina ball. X-ray photoelectron spectroscopy (XPS) analysis revealed the presence of H<sub>3</sub>BO<sub>3</sub>/B<sub>2</sub>O<sub>3</sub> compounds in the passive film on the borided sample under stagnant conditions, resulting in a lower breakdown potential compared with untreated Ti-6Al-4V. During the PP test under various normal loads, the corrosion current density (i<sub>corr</sub>) of Ti-6Al-4V and the borided samples increased up to 3100 and 4300 times, respectively, relative to values observed under the stagnant conditions. During sliding at a potential of + 1&#xa0;V vs. Ag/AgCl, the mean corrosion current for the borided sample decreased up to 66% compared with the untreated Ti-6Al-4V, indicating improved corrosion resistance. Furthermore, under the potentiostatic conditions, the amplitude of current oscillations for the borided sample gradually increased with sliding progression, while the untreated Ti-6Al-4V exhibited relatively stable oscillation amplitudes. This trend was attributed to the wear of the hard TiB₂ layer, which exposed the softer underlying TiB layer. This exposure increased the real contact area and electrical current flow, thereby intensifying corrosion during sliding.</p> Graphical Abstract <p></p>

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A comprehensive corrosion study of borided Ti-6Al-4 V during sliding in phosphate-buffered saline

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • B. Rahmatian,
  • H. M. Ghasemi,
  • M. Heydarzadeh Sohi,
  • P. De Baets

摘要

TiB2 and TiB boride layers were formed on Ti-6Al-4V using a molten-salt diffusional process at a temperature of 900 °C for 16 h. Reciprocating sliding tests in phosphate-buffered saline (PBS) solution were conducted under open circuit potential, potentiodynamic polarization (PP), and potentiostatic (+ 1 V vs. Ag/AgCl) conditions for both untreated Ti-6Al-4V and borided samples under normal loads of 0.5 N, 1 N, 5 N, and 15 N against an alumina ball. X-ray photoelectron spectroscopy (XPS) analysis revealed the presence of H3BO3/B2O3 compounds in the passive film on the borided sample under stagnant conditions, resulting in a lower breakdown potential compared with untreated Ti-6Al-4V. During the PP test under various normal loads, the corrosion current density (icorr) of Ti-6Al-4V and the borided samples increased up to 3100 and 4300 times, respectively, relative to values observed under the stagnant conditions. During sliding at a potential of + 1 V vs. Ag/AgCl, the mean corrosion current for the borided sample decreased up to 66% compared with the untreated Ti-6Al-4V, indicating improved corrosion resistance. Furthermore, under the potentiostatic conditions, the amplitude of current oscillations for the borided sample gradually increased with sliding progression, while the untreated Ti-6Al-4V exhibited relatively stable oscillation amplitudes. This trend was attributed to the wear of the hard TiB₂ layer, which exposed the softer underlying TiB layer. This exposure increased the real contact area and electrical current flow, thereby intensifying corrosion during sliding.

Graphical Abstract