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<p>This study aims to produce a micro-arc oxidation (MAO) layer of TiO<sub>2</sub> on commercially pure titanium (CP-Ti) and analyze the influence of heat treatment temperatures in the air to promote thermal oxidation and in a vacuum to prevent oxidation. The results showed that the MAO coating is amorphous and constituted by TiO<sub>2</sub> as anatase and rutile. The increase in heat treatment temperature (600–1200&#xa0;°C) promoted the formation of rutile, an increase in surface roughness, but decreased the contact angle and pore size. In the condition subjected to heat treatment in vacuum, there is also a decrease in the thickness of the layer due to atomic diffusion (13 →  ~ 0&#xa0;μm). On the other hand, the heat treatment out of vacuum oxidized the CP-Ti MAO surfaces, increasing the oxide thickness as the temperature increased (9 → 325&#xa0;μm). The increased hardness of CP-Ti at the metal/oxide interface was high due to the incorporation of oxygen in solid solution, which acts as a hardening agent. The MAO coating acts as an effective protective layer of the metal substrate against thermal oxidation.</p>

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The action of anodic TiO2 coating against thermal oxidation of pure titanium

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Pedro A. B. Kuroda,
  • Giovana C. Cardoso,
  • Mariana C. Rossi,
  • Conrado R. M. Afonso,
  • Carlos R. Grandini

摘要

This study aims to produce a micro-arc oxidation (MAO) layer of TiO2 on commercially pure titanium (CP-Ti) and analyze the influence of heat treatment temperatures in the air to promote thermal oxidation and in a vacuum to prevent oxidation. The results showed that the MAO coating is amorphous and constituted by TiO2 as anatase and rutile. The increase in heat treatment temperature (600–1200 °C) promoted the formation of rutile, an increase in surface roughness, but decreased the contact angle and pore size. In the condition subjected to heat treatment in vacuum, there is also a decrease in the thickness of the layer due to atomic diffusion (13 →  ~ 0 μm). On the other hand, the heat treatment out of vacuum oxidized the CP-Ti MAO surfaces, increasing the oxide thickness as the temperature increased (9 → 325 μm). The increased hardness of CP-Ti at the metal/oxide interface was high due to the incorporation of oxygen in solid solution, which acts as a hardening agent. The MAO coating acts as an effective protective layer of the metal substrate against thermal oxidation.