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Plasma electrolytic oxidation coating was applied on the surfaces of squeeze cast AM60 and 7 vol.% Al2O3 fibers/AM60 to improve their corrosion resistancesCorrosion resistance. The top surface and cross-section morphologies of each coated material was observed and analyzed by scanning electron microscopy and X-ray energy dispersive spectroscopy. The SEM and EDS analyses indicated that the PEO coatingPEO coating process formed a porous and dense layer on the substrate surface as well as MgAl2O4 was the major concentration of the coating. In addition, the thickness of PEO coatingPEO coating on the 7FC compositeComposite was slightly less than that of the coating on the AM60. The electrochemical corrosionCorrosion tests were carried out in 3.5% NaCl aqueous solution at room temperature to investigate the corrosionCorrosion behavior of the AM60 and the compositeComposite after applying the coating. The coating increased the corrosion resistancesCorrosion resistance of the AM60 alloy and the 7FC compositeComposite to 342.81 and 301.73 from 4.07 and 2.08 kΩ·cm2. By comparing the corrosionCorrosion test results of the coated AM60 and the compositesComposite with those of the uncoated counterparts, it was found that the coating significantly improved the corrosion resistancesCorrosion resistance by up to 154 times.

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Comparative Studies on Corrosion of Short Fibre-Reinforced Mg Composites With and Without PEO Coatings

  • 会议论文

  • 发表日期：

    2025年

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  • A. Hu,
  • X. Geng,
  • H. Hu,
  • X. Nie

摘要

Plasma electrolytic oxidation coating was applied on the surfaces of squeeze cast AM60 and 7 vol.% Al2O3 fibers/AM60 to improve their corrosion resistancesCorrosion resistance. The top surface and cross-section morphologies of each coated material was observed and analyzed by scanning electron microscopy and X-ray energy dispersive spectroscopy. The SEM and EDS analyses indicated that the PEO coatingPEO coating process formed a porous and dense layer on the substrate surface as well as MgAl2O4 was the major concentration of the coating. In addition, the thickness of PEO coatingPEO coating on the 7FC compositeComposite was slightly less than that of the coating on the AM60. The electrochemical corrosionCorrosion tests were carried out in 3.5% NaCl aqueous solution at room temperature to investigate the corrosionCorrosion behavior of the AM60 and the compositeComposite after applying the coating. The coating increased the corrosion resistancesCorrosion resistance of the AM60 alloy and the 7FC compositeComposite to 342.81 and 301.73 from 4.07 and 2.08 kΩ·cm2. By comparing the corrosionCorrosion test results of the coated AM60 and the compositesComposite with those of the uncoated counterparts, it was found that the coating significantly improved the corrosion resistancesCorrosion resistance by up to 154 times.