Structure and Selected Properties of SnO2 Thin Films
Aneta Kania1, Magdalena M Szindler1, Marek Szindler2
1Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18a, 44-100 Gliwice, Poland.
Materials (Basel, Switzerland)
|July 13, 2024
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.
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.
