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Volume 31 Issue 4
Apr.  2024
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文章导航 >  矿物冶金与材料学报（英文）  > 2024  >  31(4): 712-724
Dajun Zhai, Xiaoping Li,  and Jun Shen, Mechanism of microarc oxidation on AZ91D Mg alloy induced by β-Mg17Al12 phase, Int. J. Miner. Metall. Mater., 31(2024), No. 4, pp. 712-724. https://doi.org/10.1007/s12613-023-2752-0
Cite this article as:
Dajun Zhai, Xiaoping Li,  and Jun Shen, Mechanism of microarc oxidation on AZ91D Mg alloy induced by β-Mg17Al12 phase, Int. J. Miner. Metall. Mater., 31(2024), No. 4, pp. 712-724. https://doi.org/10.1007/s12613-023-2752-0
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研究论文

β-Mg17Al12相诱导AZ91D 镁合金微弧氧化过程机理

  • 重庆大学材料科学与工程学院, 重庆 400044，中国


  • 通讯作者:

    沈骏    E-mail: shenjun@cqu.edu.cn

文章亮点

  • (1) 通过控制AZ91D镁合金中β-Mg17Al12相的含量和分布，提出了一种间接诱导均匀微弧放电的策略。
  • (2) 通过摩擦搅拌加工将纳米ZrO2颗粒固定在晶界上，促进了晶粒中β-Mg17Al12相的沉淀，有效抑制了微弧放电的“级联”现象。
  • (3) 通过减弱β-Mg17Al12相引起的放电“级联”强度而获得的微弧氧化涂层具有良好的湿润性和耐腐蚀性。
  • 由于镁合金中元素的不均匀分布以及金属间相的存在，导致合金表面的电化学特性是不均匀的。通过在镁合金中控制第二相β-Mg17Al12的含量和分布来间接诱导均匀微弧放电的方法有着巨大的研究潜力。本文通过搅拌摩擦处理（FSP）将两种纳米颗粒（ZrO2和TiO2）加入到镁合金基体中。然后，在磷酸盐和硅酸盐混合电解液中对设计的具有不同沉淀形态的β-Mg17Al12相的镁合金样品进行微弧氧化处理。利用扫描电子显微镜（SEM）、能谱仪（EDS）、X射线衍射仪（XRD）、X光电子能谱仪、接触角仪和动电位极化仪对微弧氧化涂层的特性和性能进行分析。结果表明，FSP工艺细化了AZ91D轧制镁合金内的α-Mg晶粒，搅碎了β-Mg17Al12相的网状结构，使β相弥散分布。纳米ZrO2颗粒通过FSP工艺可钉扎在镁合金晶界处，不仅促进了α-Mg晶粒的细化，而且还促进了β相在α-Mg晶界处和晶内的弥散析出。由此有效地抑制了镁合金表面微弧氧化“级联”放电现象，从而导致放电孔隙的均匀分布。因此，通过FSP工艺将纳米ZrO2颗粒固定在晶界上，调控了基体中的β-Mg17Al12相结构和分布，提高了基体表面微弧氧化涂层的润湿性和耐腐蚀性。然而，在Ti-FSP样品上的微弧氧化涂层中几乎没有检测到TiO2颗粒。
    • Research Article

    Mechanism of microarc oxidation on AZ91D Mg alloy induced by β-Mg17Al12 phase

    + Author Affiliations
      Abstract
    • This work proposed a strategy of indirectly inducing uniform microarc discharge by controlling the content and distribution of β-Mg17Al12 phase in AZ91D Mg alloy. Two kinds of nano-particles (ZrO2 and TiO2) were designed to be added into the substrate of Mg alloy by friction stir processing (FSP). Then, Mg alloy sample designed with different precipitated morphology of β-Mg17Al12 phase was treated by microarc oxidation (MAO) in Na3PO4/Na2SiO3 electrolyte. The characteristics and performance of the MAO coating was analyzed using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), contact angle meter, and potentiodynamic polarization. It was found that the coarse α-Mg grains in extruded AZ91D Mg alloy were refined by FSP, and the β-Mg17Al12 phase with reticular structure was broken and dispersed. The nano-ZrO2 particles were pinned at the grain boundary by FSP, which refined the α-Mg grain and promoted the precipitation of β-Mg17Al12 phase in grains. It effectively inhibited the “cascade” phenomenon of microarcs, which induced the uniform distribution of discharge pores. The MAO coating on Zr-FSP sample had good wettability and corrosion resistance. However, TiO2 particles were hardly detected in the coating on Ti-FSP sample.
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