.png){kind=icon}
.png){kind=icon}
Return
Graphene oxide-engineered Ta2O5 plasma electrolytic oxidation coatings on tantalum implants for enhanced corrosion protection in simulated inflammatory media
.png){kind=icon}
PRE
AI
T
H
M
H
A
F
S
M
M
M
DOI：10.1016/j.diamond.2026.114040.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Graphene oxide (GO) nanosheets were incorporated into Ta2O5-based plasma electrolytic oxidation (PEO) coatings on commercially pure tantalum to improve the barrier performance of biomedical surfaces. Coatings were produced in phosphate-alkaline electrolytes containing 0, 0.1, 0.3, and 0.5 g L−1 GO and characterized in terms of voltage-time response, thickness, roughness, phase composition, Raman signature, surface morphology, and porosity. Electrochemical behaviour was evaluated in normal simulated body fluid (SBF, pH 7.4) and simulated inflammatory medium (SBF + 100 mM H2O2, pH 5.2) at 37 °C using open circuit potential monitoring, potentiodynamic polarization, and electrochemical impedance spectroscopy. GO addition modified the plasma discharge response and promoted coating growth up to an optimum concentration. The 0.3 g L−1 GO-incorporated coating showed the highest thickness, roughness, and electrochemical resistance, while excessive GO addition slightly reduced the coating performance, probably due to nanosheet agglomeration and discharge heterogeneity. Raman spectra confirmed the presence of GO-related D and G bands in the GO-containing coating. In both media, PEO coatings reduced the corrosion current density and increased the impedance response compared with bare Ta. Although H2O2 and acidic pH decreased the resistance of all samples, GO-containing coatings maintained superior protection by increasing diffusion tortuosity and blocking pore pathways.
Keywords:
Tantalum
Graphene oxide
Plasma electrolytic oxidation
Ta2O5 coating
Simulated inflammatory medium
Electrochemical impedance spectroscopy
Journal
IF:
5.1
Papers:
2.1K
Citations:
2.4W
Organization
Cited Papers