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<p>The present study explores the tribocorrosion, cytotoxicity, and wettability characteristics of nano-ZnO-coated and uncoated Mg-Zn-0.2Gd-nZnO (n = 1, 1.5, 2 wt.% of ZnO) nanocomposites in the presence of simulated body fluids (SBF). The required alloys and nanocomposites were developed using stir ultrasonication followed by squeeze casting. The fabricated samples were T5 heat-treated and then spin-coated with ZnO nanoparticles. Results of the tribocorrosion test highlight that the coated samples displayed a low corrosion current density (I<sub>corr</sub>) of 1.94 × 10 − 5 A cm<sup>−2</sup>, a high corrosion potential (E<sub>corr</sub>) of − 0.818&#xa0;V, and a low degradation rate of 0.375&#xa0;mm/yr. The formation of MgZn<sub>3</sub>, MgZn precipitates, and a strong nano-ZnO coating effectively reduces the oxidation reaction during tribocorrosion. The ZnO nano-oxide layer, which was formed during coating, acts as a barrier against tribocorrosion. The cytotoxicity performance was analyzed by a mouse fibroblast L929 cell line, which demonstrates enhanced cell viability during in vitro tests. A low contact angle of 62.1° in the wettability test indicates that the coating of nano-ZnO improved the surface's hydrophilicity. Due to its better bioactivity and improved degradation resistance, coated Mg nanocomposite samples have the prospect of being used in bone fixation plate applications.</p>

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Tribocorrosion and Cytotoxicity Performance of Nano-Zinc Oxide-Coated Magnesium Nanocomposites in Simulated Body Fluid Environment

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Mariyappan Mahalingam,
  • Poovazhagan Lakshmanan,
  • Gnanavelbabu Annamalai,
  • Parthiban Krishnan

摘要

The present study explores the tribocorrosion, cytotoxicity, and wettability characteristics of nano-ZnO-coated and uncoated Mg-Zn-0.2Gd-nZnO (n = 1, 1.5, 2 wt.% of ZnO) nanocomposites in the presence of simulated body fluids (SBF). The required alloys and nanocomposites were developed using stir ultrasonication followed by squeeze casting. The fabricated samples were T5 heat-treated and then spin-coated with ZnO nanoparticles. Results of the tribocorrosion test highlight that the coated samples displayed a low corrosion current density (Icorr) of 1.94 × 10 − 5 A cm−2, a high corrosion potential (Ecorr) of − 0.818 V, and a low degradation rate of 0.375 mm/yr. The formation of MgZn3, MgZn precipitates, and a strong nano-ZnO coating effectively reduces the oxidation reaction during tribocorrosion. The ZnO nano-oxide layer, which was formed during coating, acts as a barrier against tribocorrosion. The cytotoxicity performance was analyzed by a mouse fibroblast L929 cell line, which demonstrates enhanced cell viability during in vitro tests. A low contact angle of 62.1° in the wettability test indicates that the coating of nano-ZnO improved the surface's hydrophilicity. Due to its better bioactivity and improved degradation resistance, coated Mg nanocomposite samples have the prospect of being used in bone fixation plate applications.