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The ceramic coating on the surface of tantalum was fabricated using micro-arc oxidation technology. The surface properties as well as the microstructure, phase composition, and bonding force of the ceramic coating fabricated in different kinds of electrolytes were studied. The growth behavior was also discussed by studying its electrochemical impedance spectroscope (EIS) characteristics. The results showed that the ceramic coating could be fabricated in the electrolyte of Na2SiO3, Na3PO4 and NaAlO2, respectively. Ta2O5 is the main phase composition of the ceramic coating when fabricated in Na2SiO3 and Na3PO4 electrolytes. The ceramic coating formed in NaAlO2 electrolyte was mainly composed of the Ta-O amorphous phase. The bonding force of the ceramic coating is the best when fabricated in NaAlO2 electrolyte. Compared with the ceramics coating fabricated in other electrolytes, the impedance value R2 was the largest when fabricated in NaAlO2 electrolyte, indicating that the ceramic coating is the densest. In conclusion, ceramic coating on the surface of tantalum could be fabricated in selected electrolyte successfully, but different phase compositions and densities appeared with different kinds of electrolytes.

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Effect of Electrolyte on the Phase Composition and Microstructure of Micro-arc Oxidation Ceramic Coating on the Surface of Tantalum

  • 会议论文

  • 发表日期：

    2025年

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  • Pei Zhao,
  • Aijuan Wang,
  • Zhaobo Li,
  • Kai Wang,
  • Fang Fang,
  • Dongliang Ge,
  • Jiale Wang

摘要

The ceramic coating on the surface of tantalum was fabricated using micro-arc oxidation technology. The surface properties as well as the microstructure, phase composition, and bonding force of the ceramic coating fabricated in different kinds of electrolytes were studied. The growth behavior was also discussed by studying its electrochemical impedance spectroscope (EIS) characteristics. The results showed that the ceramic coating could be fabricated in the electrolyte of Na2SiO3, Na3PO4 and NaAlO2, respectively. Ta2O5 is the main phase composition of the ceramic coating when fabricated in Na2SiO3 and Na3PO4 electrolytes. The ceramic coating formed in NaAlO2 electrolyte was mainly composed of the Ta-O amorphous phase. The bonding force of the ceramic coating is the best when fabricated in NaAlO2 electrolyte. Compared with the ceramics coating fabricated in other electrolytes, the impedance value R2 was the largest when fabricated in NaAlO2 electrolyte, indicating that the ceramic coating is the densest. In conclusion, ceramic coating on the surface of tantalum could be fabricated in selected electrolyte successfully, but different phase compositions and densities appeared with different kinds of electrolytes.