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<p>Hydrophobic poly-lactic acid (PLA)-based nanocomposite coatings incorporating green synthesized trio oxide nanoparticles (NPs) were successfully developed on a galvanized iron (GI) sheet using the sol-gel dip coating process. The scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX) confirmed the existence of smooth, dense, and crack-free nanocomposite coatings, resulting in a thickness of 70-80&#xa0;µm. Water contact angle measurements revealed superior hydrophobic properties in the PLA/Fe-Ni-Cr coated sample, with a contact angle of 104.8°—a 51.43 % increase compared to the bare GI substrate. The NP effectively sealed porosities, reducing corrosion, and demonstrated significant antibacterial properties by disrupting bacterial cell membranes. Additionally, the nanocomposite coatings demonstrated enhanced anti-fouling properties, as evidenced by the egg white test. Scratch tests revealed a 64.41% higher scratch hardness for the PLA/Cu-Mg-Zn coating than the PLA/Fe-Ni-Cr coating attributed to greater thickness and adhesion strength. Electrochemical and immersion tests in a 3.5% NaCl solution demonstrated that both PLA/Fe-Ni-Cr and PLA/Cu-Mg-Zn nanocomposite coatings exhibited higher corrosion resistance than the bare GI substrate.</p>

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Hydrophobic PLA/Nano-Trio Oxide Coatings for Improved Corrosion and Fouling Protection of Galvanized Iron

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Prakash Kumar,
  • Sumit Kumar,
  • Shashi Ranjan,
  • Utsav Mani,
  • Sanjeev Kumar,
  • Chandra Bhushan Kumar Yadav,
  • Danvendra Singh,
  • Md Saeb Sufyan

摘要

Hydrophobic poly-lactic acid (PLA)-based nanocomposite coatings incorporating green synthesized trio oxide nanoparticles (NPs) were successfully developed on a galvanized iron (GI) sheet using the sol-gel dip coating process. The scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX) confirmed the existence of smooth, dense, and crack-free nanocomposite coatings, resulting in a thickness of 70-80 µm. Water contact angle measurements revealed superior hydrophobic properties in the PLA/Fe-Ni-Cr coated sample, with a contact angle of 104.8°—a 51.43 % increase compared to the bare GI substrate. The NP effectively sealed porosities, reducing corrosion, and demonstrated significant antibacterial properties by disrupting bacterial cell membranes. Additionally, the nanocomposite coatings demonstrated enhanced anti-fouling properties, as evidenced by the egg white test. Scratch tests revealed a 64.41% higher scratch hardness for the PLA/Cu-Mg-Zn coating than the PLA/Fe-Ni-Cr coating attributed to greater thickness and adhesion strength. Electrochemical and immersion tests in a 3.5% NaCl solution demonstrated that both PLA/Fe-Ni-Cr and PLA/Cu-Mg-Zn nanocomposite coatings exhibited higher corrosion resistance than the bare GI substrate.