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Dajun Zhai, Tao Qiu, Jun Shen, and Keqin Feng, Growth kinetics and mechanism of microarc oxidation coating on Ti–6Al–4V alloy in phosphate/silicate electrolyte, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-022-2413-8
Cite this article as:
Dajun Zhai, Tao Qiu, Jun Shen, and Keqin Feng, Growth kinetics and mechanism of microarc oxidation coating on Ti–6Al–4V alloy in phosphate/silicate electrolyte, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-022-2413-8
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研究论文

Ti–6Al–4V合金微弧氧化膜在磷酸盐/硅酸盐电解液中的生长动力学过程及其机理

  • 通讯作者:

    沈骏    E-mail: shenjun@cqu.edu.cn

  • 微弧氧化(Microarc oxidation,MAO)是一种有效的钛合金表面处理方法,可使处理后的金属在极端环境中得到广泛应用。本文中,我们设计了Ti–6Al–4V合金在由不同占比的磷酸钠和硅酸钠组成的二元电解液中的MAO实验。采用扫描电子显微镜、透射电子显微镜、X射线衍射仪和动电位极化测试系统观察和测试了MAO涂层的表面形貌、成分和性能,以揭示PO43-$ {\text{SiO}}_3^{2 - }$离子对MAO涂层生长动力学的影响。结果表明,PO43-离子有利于在涂层内部产生微弧和孔隙,从而促进厚且多孔涂层的形成。$ {\text{SiO}}_3^{2 - }$离子有利于外部沉积层内孔隙的堵塞而阻碍微弧的产生,从而促进薄且致密涂层的形成。MAO涂层的厚度、密度、相含量和极化电阻主要受到放电微弧强度和数量的影响。在微弧放电过程中,在P/Si二元电解液中获得的MAO涂层的厚度随着处理时间的增加呈分段线性增长。另外,$ {\text{SiO}}_3^{2 - }$离子在MAO过程中的沉积增加了涂层致密度,从而导致下一阶段涂层的生长速率显著降低。
  • Research Article

    Growth kinetics and mechanism of microarc oxidation coating on Ti–6Al–4V alloy in phosphate/silicate electrolyte

    + Author Affiliations
    • Microarc oxidation (MAO) is an effective surface treatment method for Ti alloys to allow their application in extreme environments. Here, binary electrolytes consisting of different amounts of sodium phosphate and sodium silicate were designed for MAO. The surface morphology, composition, and properties of MAO coatings on Ti–6Al–4V alloy treated in 0.1 mol/L electrolyte were investigated to reveal the effect of ${\rm PO}_4^{3-} $ and ${\rm SiO}_3^{2-} $ on the growth kinetics of the MAO coatings, using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and potentiodynamic polarization. The results showed that ${\rm PO}_4^{3-} $ is beneficial for generating microarcs and forming pores within the coating, resulting in a thick but porous coating. ${\rm SiO}_3^{2-} $ facilitates the blocking of pores in the outer deposition layer and impedes the generation of microarcs, resulting in a thin dense coating. The thickness, density, phases content, and polarization resistance of the MAO coatings are primarily affected by the intensity of microarcs for low ${\rm SiO}_3^{2-} $ contents, and by the number of microarcs when the ${\rm SiO}_3^{2-} $ content is sufficiently high. The thickness of MAO coatings obtained in P/Si electrolytes shows a piecewise linear increase with increasing process time during the three stages of microarc discharge. ${\rm SiO}_3^{2-} $ is beneficial to the density increase of the coating formed in the previous stage of microarcs discharge, but slows down the growth of the coating formed in the next stage.
    • The authors declare no conflict of interest.
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