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Structure and Selected Properties of SnO2 Thin Films.

Aneta Kania1, Magdalena M Szindler1, Marek Szindler2

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Summary

This study investigated tin oxide (SnO2) coatings on magnesium (Mg) alloys for temporary implants. Thicker SnO2 films enhanced corrosion resistance, crucial for biomedical applications.

Keywords:
ALD methodSnO2 thin filmscorrosion resistancecorrosion studiesstructure analysis

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Area of Science:

  • Biomaterials Science
  • Materials Science
  • Corrosion Engineering

Background:

  • Magnesium (Mg) alloys offer biocompatibility and biodegradability for temporary implants.
  • Poor corrosion resistance limits the clinical application of Mg alloys.
  • Surface modification is a key strategy to improve Mg alloy performance.

Purpose of the Study:

  • To analyze the structure and morphology of MgCa2Zn1 and MgCa2Zn1Gd3 alloys coated with tin oxide (SnO2) films.
  • To evaluate the corrosion resistance of SnO2-coated Mg alloys in a physiological environment.
  • To correlate film thickness with corrosion protection.

Main Methods:

  • Atomic Layer Deposition (ALD) for SnO2 film fabrication.
  • Scanning Electron Microscopy (SEM) for surface morphology analysis.
  • X-ray Fluorescence (XRF) and X-ray Diffraction (XRD) for elemental and structural characterization.
  • Electrochemical tests (including EIS) and immersion tests for corrosion evaluation.

Main Results:

  • SnO2 films exhibited a heterogeneous crystal structure with rough surfaces and pores.
  • Increased SnO2 film thickness significantly improved corrosion resistance.
  • Corrosion products were lamellar and contained Mg, O, Ca, and Cl.

Conclusions:

  • SnO2 coatings via ALD can enhance the corrosion resistance of Mg alloys.
  • Film thickness is a critical factor in achieving effective corrosion protection.
  • This approach holds promise for developing advanced temporary biomedical implants.