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<p>This study has investigated the effects of constrained groove pressing (CGP) and hydrothermal TiO<sub>2</sub> coating on the microstructure, mechanical properties, and corrosion resistance of Ti-6Al-4V alloy. One CGP pass has led to grain refinement, reducing the grain size from 19 μm to 14 μm and increasing microhardness by approximately 23.6% (from 308 to 381 HV). High-purity anatase-phase TiO<sub>2</sub> nanoparticles have been synthesized via thermal hydrolysis of TiOSO<sub>2</sub> and applied to uniformly coat the alloy surface using a hydrothermal method. Characterization via XRD, Raman, and XPS has confirmed the formation and uniform distribution of anatase TiO<sub>2</sub>. Electrochemical testing in 3.5 wt.% NaCl has shown that CGP has reduced the corrosion rate from 0.234 to 0.196 mm/year, and the TiO<sub>2</sub> coating has further decreased it to 0.078 mm/year. No corrosion products were detected on the coated surface, confirming the protective role of the TiO<sub>2</sub> film.</p>

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Corrosion Characterization of Ti-6Al-4V Alloy After Constrained Groove Pressing and TiO2 Coating

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Ismail Bencherifa,
  • Ilyas Belkhettab,
  • Abdelmounaim Chetoui,
  • Khaled Derkaoui,
  • Oussama Dabou,
  • Slimane Latreche,
  • Billel Hamdoud

摘要

This study has investigated the effects of constrained groove pressing (CGP) and hydrothermal TiO2 coating on the microstructure, mechanical properties, and corrosion resistance of Ti-6Al-4V alloy. One CGP pass has led to grain refinement, reducing the grain size from 19 μm to 14 μm and increasing microhardness by approximately 23.6% (from 308 to 381 HV). High-purity anatase-phase TiO2 nanoparticles have been synthesized via thermal hydrolysis of TiOSO2 and applied to uniformly coat the alloy surface using a hydrothermal method. Characterization via XRD, Raman, and XPS has confirmed the formation and uniform distribution of anatase TiO2. Electrochemical testing in 3.5 wt.% NaCl has shown that CGP has reduced the corrosion rate from 0.234 to 0.196 mm/year, and the TiO2 coating has further decreased it to 0.078 mm/year. No corrosion products were detected on the coated surface, confirming the protective role of the TiO2 film.