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Biodegradable magnesium alloy implants have garnered much attention thanks to their outstanding mechanical characteristics and biocompatibility. Nevertheless, they corrode rapidly in certain conditions, which limits using them in different applications. This study focuses on the design of Chitosan/Graphene Oxide Composite coating (CS/GO) to monitor the corrosion spaces of biodegradable AZ31 Mg alloy used as a temporary implant. The composites coating is applied using a cost-effective spin-coating technique, ensuring uniformity across magnesium alloy substrates. The microstructure was investigated using scanning electron microscopy to explore the coating’s density and compactness. The mechanical characteristics of the chitosan/graphene oxide composites were further examined using Vickers microhardness technique and scratching test. Results indicated a significant enhancement in Mg alloy’s hardness, which from 64.25 ± 3.21 HV to 555.1 ± 27.75 HV when applying CS/GO coating. Furthermore, the scratch testing revealed that the cohesive critical load LC1 for CS/GO composite reached approximately 2.1 ± 0.11N. Corrosion resistance was evaluated in vitro using simulated body fluid at a temperature of 37 ℃. Therefore, the composite can reduce substrate corrosion and lower costs as well as discomfort associated with the implants.

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Biopolymeric Composite Coatings for Controlled Degradation and Mechanical Behavior of AZ31 as Temporary Biodegradable Implants

  • 会议论文

  • 发表日期：

    2026年

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  • M. S. Atallah,
  • A. Khlifi,
  • K. Khlifi,
  • N. barhomi,
  • M. J. Sima Nkele,
  • M. Atapour,
  • A. H. Said

摘要

Biodegradable magnesium alloy implants have garnered much attention thanks to their outstanding mechanical characteristics and biocompatibility. Nevertheless, they corrode rapidly in certain conditions, which limits using them in different applications. This study focuses on the design of Chitosan/Graphene Oxide Composite coating (CS/GO) to monitor the corrosion spaces of biodegradable AZ31 Mg alloy used as a temporary implant. The composites coating is applied using a cost-effective spin-coating technique, ensuring uniformity across magnesium alloy substrates. The microstructure was investigated using scanning electron microscopy to explore the coating’s density and compactness. The mechanical characteristics of the chitosan/graphene oxide composites were further examined using Vickers microhardness technique and scratching test. Results indicated a significant enhancement in Mg alloy’s hardness, which from 64.25 ± 3.21 HV to 555.1 ± 27.75 HV when applying CS/GO coating. Furthermore, the scratch testing revealed that the cohesive critical load LC1 for CS/GO composite reached approximately 2.1 ± 0.11N. Corrosion resistance was evaluated in vitro using simulated body fluid at a temperature of 37 ℃. Therefore, the composite can reduce substrate corrosion and lower costs as well as discomfort associated with the implants.