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<p>Ca/P/Se-containing micro-arc oxidation (MAO) coatings were fabricated on Ti–13Nb–13Zr alloy using AC and DC modes to compare their structural, electrochemical, and short-term bioactive responses. AC processing produced thicker, rougher, and more hydrophilic coatings than DC, promoting ion adsorption and Ca–P deposition. Electrochemical tests in Hanks’ solution revealed that while DC coatings showed higher outer-region resistance, AC coatings demonstrated a progressive increase in space charge resistance and formation of a phosphate-rich layer. XRD confirmed the presence of hydroxyapatite after 7&#xa0;days of immersion, demonstrating <i>in vitro</i> mineralization of AC coatings. Current mode selection thus critically governs MAO coating functionality.</p> Graphical abstract <p></p>

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Corrosion resistance and early bioactivity of Ca/P/Se-incorporated MAO coatings on Ti–13Nb–13Zr alloy: AC versus DC regimes

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Balbina Makurat-Kasprolewicz,
  • Endzhe Matykina

摘要

Ca/P/Se-containing micro-arc oxidation (MAO) coatings were fabricated on Ti–13Nb–13Zr alloy using AC and DC modes to compare their structural, electrochemical, and short-term bioactive responses. AC processing produced thicker, rougher, and more hydrophilic coatings than DC, promoting ion adsorption and Ca–P deposition. Electrochemical tests in Hanks’ solution revealed that while DC coatings showed higher outer-region resistance, AC coatings demonstrated a progressive increase in space charge resistance and formation of a phosphate-rich layer. XRD confirmed the presence of hydroxyapatite after 7 days of immersion, demonstrating in vitro mineralization of AC coatings. Current mode selection thus critically governs MAO coating functionality.

Graphical abstract