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CSME 2025/10
Volume 46 No.5
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467-474
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Sol–Gel Derived SiO₂/PMMA Composite Coatings with Tunable Dispersion for Corrosion Protection of Ti-6Al-4V
Cheng-En Jiang a, Guan-Yu Chen a and Shih-Chen Shi b
aStudent, Department of Mechanical Engineering, National Cheng Kung University, 70101 Tainan, Taiwan
bProfessor, Department of Mechanical Engineering, National Cheng Kung University, 70101 Tainan, Taiwan
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Abstract:
This study presents a sol–gel-based strategy to synthesize amorphous SiO₂ nanoparticles and incorporate them into PMMA to form corrosion-resistant composite coatings for Ti-6Al-4V substrates. The effects of synthesis parameters precursor concentration, catalyst concentration, reaction time, and temperature on particle size and dispersion were systematically investigated. Voronoi-based dispersion index (D0.2) was used to quantify uniformity, showing that catalyst concentration played the most critical role in dispersion control. Well-dispersed SiO₂ nanoparticles (D0.2 > 50%) significantly improved electrochemical barrier performance, as confirmed by electrochemical impedance spectroscopy (EIS). The optimal composite, containing 5 wt% SiO₂, exhibited impedance magnitudes in the range of 108–109 Ω·cm² at low frequencies and stable phase angles (80–90°), indicating dense coating morphology and strong dielectric behavior. In contrast, higher filler content (10 wt%) led to aggregation, structural defects, and diminished corrosion protection. The findings confirm that nanoparticle dispersion is a key factor in coating integrity and validate a practical design route for high-performance polymer-based anticorrosion coatings.
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Keywords: Silica nanoparticle; PMMA composite coating; Corrosion resistance
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©
2025
CSME , ISSN 0257-9731
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