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Microstructure and Corrosion Behavior of Iron Based Biocomposites Prepared by Laser Additive Manufacturing.

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Summary

Iron (Fe) bone implants degrade slowly. Introducing zinc sulfide (ZnS) accelerates Fe degradation by altering the passive film, making Fe/ZnS a promising bone repair material with good cell viability.

Keywords:
degradation propertiesiron bone implantlaser powder bed fusionpassivation filmzinc sulfide

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Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Orthopedic Surgery

Background:

  • Iron (Fe) is a promising bone repair material due to its biocompatibility and mechanical strength.
  • Slow degradation of Fe implants hinders optimal bone regeneration by limiting interaction with bodily fluids.
  • The passive film on Fe surfaces impedes necessary degradation processes.

Purpose of the Study:

  • To enhance the degradation rate of iron-based bone implants.
  • To investigate the effect of incorporating zinc sulfide (ZnS) on Fe implant properties.
  • To evaluate the potential of Fe/ZnS biocomposites for bone repair applications.

Main Methods:

  • Laser additive manufacturing was used to create Fe/ZnS biocomposite implants.
  • ZnS incorporation induced disproportionation reactions, forming sulfur-containing species.
  • Immersion tests and in vitro cell culture assays were performed to assess degradation and biocompatibility.

Main Results:

  • The presence of ZnS altered film properties such as semiconductivity and doping concentration.
  • Accelerated degradation of the Fe matrix was observed, characterized by pitting corrosion.
  • Fe/ZnS biocomposites demonstrated acceptable cell viabilities in in vitro testing.

Conclusions:

  • The Fe/ZnS biocomposite effectively promotes faster degradation of the iron matrix.
  • The modified passive film properties are key to enhanced corrosion and degradation.
  • Fe/ZnS biocomposites represent a promising advancement for bone repair materials.