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Volume 31 Issue 9
Sep.  2024
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文章导航 >  矿物冶金与材料学报（英文）  > 2024  >  31(9): 2048-2061
Jirui Ma, Xiaopeng Lu, Santosh Prasad Sah, Qianqian Chen, You Zhang, and Fuhui Wang, Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO3)2 solutions, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 2048-2061. https://doi.org/10.1007/s12613-024-2876-x
Cite this article as:
Jirui Ma, Xiaopeng Lu, Santosh Prasad Sah, Qianqian Chen, You Zhang, and Fuhui Wang, Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO3)2 solutions, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 2048-2061. https://doi.org/10.1007/s12613-024-2876-x
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研究论文

Ba(NO3)2溶液原位掺杂缓蚀剂对AM50镁合金微弧氧化涂层耐蚀性的影响

  • 1)

    沈阳东北大学材料科学国家实验室, 沈阳110819, 中国

  • 2)

    Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan

  • 3)

    北京石化技术学院新材料与化学工程学院, 北京102617, 中国


  • 通讯作者:

    卢小鹏    E-mail: luxiaopeng@mail.neu.edu.cn

    张优    E-mail: youzhang@bipt.edu.cn

文章亮点

  • (1) 设计了一种新型微弧氧化涂层后处理方法，使用无机盐原位掺杂缓蚀剂对微弧氧化涂层封孔后处理。
  • (2) 系统地研究了不同缓蚀剂存在下涂层的形貌、成分及性能的变化。
  • (3) 探究了后处理溶液组分对复合涂层耐蚀性能的影响机制。
  • 微弧氧化是一种提高轻质合金耐蚀耐磨性能的表面处理技术，在高温高压作用下，可在基体金属表面原位生成一层陶瓷氧化涂层。由于火花放电和大量气体析出，镁合金微弧氧化涂层通常具有较高的孔隙率，一定程度上降低了其致密性和耐蚀性能。为了提高其长期耐蚀性能，本文使用硝酸钡溶液对AM50镁合金微弧氧化涂层封孔处理，并在后处理溶液中加入了十二烷基硫酸钠和十二烷基苯磺酸钠两种缓蚀剂，研究了不同缓蚀剂的添加对涂层的微观形貌、相成分、耐蚀性等方面的影响。结果表明，缓蚀剂的加入有效提高了涂层表面BaO2的沉积量，同时缓蚀剂可吸附进入涂层内部，大幅提高涂层的长周期耐蚀性能。其中，含有十二烷基硫酸钠的涂层耐蚀性最佳，在0.5 wt% NaCl溶液中浸泡768 h后，低频阻抗模值仍能达到926 kΩ⋅cm²。经过40天的盐雾试验后，未观察到任何明显的腐蚀区域。这些优异的性能与缓蚀剂的加入有关，缓蚀剂的吸附引起涂层表面电位变负，钡离子与负电荷区域的作用导致表面沉积量增加。此外，缓蚀剂可以有效地加载到涂层内部，并在浸泡过程中连续释放以保护涂层。
    • Research Article

    Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO3)2 solutions

    + Author Affiliations
      Abstract
    • To enhance the long-term corrosion resistance of the plasma electrolytic oxidation (PEO) coating on the magnesium (Mg) alloy, an inorganic salt combined with corrosion inhibitors was used for posttreatment of the coating. In this study, the corrosion performance of PEO-coated AM50 Mg was significantly improved by loading sodium lauryl sulfonate (SDS) and sodium dodecyl benzene sulfonate into Ba(NO3)2 post-sealing solutions. Scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, Fourier transform infrared spectrometer, and ultraviolet–visible analyses showed that the inhibitors enhanced the incorporation of BaO2 into PEO coatings. Electrochemical impedance showed that post-sealing in Ba(NO3)2/SDS treatment enhanced corrosion resistance by three orders of magnitude. The total impedance value remained at 926 Ω·cm² after immersing in a 0.5wt% NaCl solution for 768 h. A salt spray test for 40 days did not show any obvious region of corrosion, proving excellent post-sealing by Ba(NO3)2/SDS treatment. The corrosion resistance of the coating was enhanced through the synergistic effect of BaO2 pore sealing and SDS adsorption.
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