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<p>This study explores the effects of NaF concentrations on the microstructural and mechanical properties of oxide films on TC4 titanium alloy via microarc oxidation (MAO). Results indicate that NaF significantly enhances coating growth, uniformity, and thickness, while also improving surface smoothness and reducing porosity within an optimal concentration range. Mechanical properties, such as hardness and adhesion, initially improve but decline at higher NaF levels, suggesting a critical threshold. Additionally, NaF enhances corrosion resistance by promoting a denser, chemically stable oxide layer. However, excessive NaF leads to structural inhomogeneity and increased porosity, negatively impacting coating densification and corrosion resistance. This research underscores NaF’s dual role in optimizing MAO coatings on titanium alloys, emphasizing the need for a balanced concentration to achieve optimal mechanical and protective properties.</p>

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Effect of NaF Addition on the Properties of TC4 Titanium Alloy Micro-Arc Oxidized Coating

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Xiaowen Chen,
  • Bin Luo,
  • Junwei Yang,
  • Han Luo,
  • Song Tang,
  • Wanlin Xie,
  • Defen Zhang

摘要

This study explores the effects of NaF concentrations on the microstructural and mechanical properties of oxide films on TC4 titanium alloy via microarc oxidation (MAO). Results indicate that NaF significantly enhances coating growth, uniformity, and thickness, while also improving surface smoothness and reducing porosity within an optimal concentration range. Mechanical properties, such as hardness and adhesion, initially improve but decline at higher NaF levels, suggesting a critical threshold. Additionally, NaF enhances corrosion resistance by promoting a denser, chemically stable oxide layer. However, excessive NaF leads to structural inhomogeneity and increased porosity, negatively impacting coating densification and corrosion resistance. This research underscores NaF’s dual role in optimizing MAO coatings on titanium alloys, emphasizing the need for a balanced concentration to achieve optimal mechanical and protective properties.