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<p>Mg–Zn–0.2Gd–2ZnO nanocomposites were produced by stir ultrasonication-assisted squeeze casting. This approach breaks nanoparticle agglomerates and uniformly disperses Zinc Oxide (ZnO) nanoparticles in the molten matrix, thereby improving grain refinement and interfacial bonding. The developed Mg nanocomposites were coated by Plasma Electrolytic Oxidation (PEO) embedded with ZnO nanoparticles. Under a constant current PEO process, the effects of nanoparticles on the composition and impact of the coating were examined. The corrosion performance of the coatings was assessed using immersion testing in a simulated bodily fluid environment and electrochemical impedance spectroscopy. SEM and XRD were used to examine the ZnO-coated Mg nanocomposites surface morphology, structural features, and corrosion resistance. The results indicated that most of the nano ZnO particles were effectively integrated into the PEO coatings, and the coating's microstructure was notably altered with ZnO concentration, leading to enhanced corrosion resistance. Furthermore, the fabricated nanocomposite coating demonstrated a significantly low <i>i</i><sub>corr</sub> when exposed to the corrosive electrolyte, offering valuable insight into the development of highly corrosion-resistant PEO coatings on Mg nanocomposites. Immersion corrosion tests demonstrated a significant decrease in the corrosion rate from around 0.021 mm/year for uncoated samples to roughly 0.005 mm/year for ZnO–PEO coated samples, indicating a 60–75% enhancement in corrosion resistance.</p>

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Nano ZnO Incorporated PEO Coatings for Enhanced Corrosion Protection of Magnesium Nanocomposites Produced via Ultrasonication Assisted Squeeze Casting

  • 期刊论文

  • 发表日期：

    2026年3月14日

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  • Mariyappan Mahalingam,
  • Poovazhagan Lakshmanan,
  • Parthiban Krishnan,
  • G. Vijayarajaragavan

摘要

Mg–Zn–0.2Gd–2ZnO nanocomposites were produced by stir ultrasonication-assisted squeeze casting. This approach breaks nanoparticle agglomerates and uniformly disperses Zinc Oxide (ZnO) nanoparticles in the molten matrix, thereby improving grain refinement and interfacial bonding. The developed Mg nanocomposites were coated by Plasma Electrolytic Oxidation (PEO) embedded with ZnO nanoparticles. Under a constant current PEO process, the effects of nanoparticles on the composition and impact of the coating were examined. The corrosion performance of the coatings was assessed using immersion testing in a simulated bodily fluid environment and electrochemical impedance spectroscopy. SEM and XRD were used to examine the ZnO-coated Mg nanocomposites surface morphology, structural features, and corrosion resistance. The results indicated that most of the nano ZnO particles were effectively integrated into the PEO coatings, and the coating's microstructure was notably altered with ZnO concentration, leading to enhanced corrosion resistance. Furthermore, the fabricated nanocomposite coating demonstrated a significantly low icorr when exposed to the corrosive electrolyte, offering valuable insight into the development of highly corrosion-resistant PEO coatings on Mg nanocomposites. Immersion corrosion tests demonstrated a significant decrease in the corrosion rate from around 0.021 mm/year for uncoated samples to roughly 0.005 mm/year for ZnO–PEO coated samples, indicating a 60–75% enhancement in corrosion resistance.