Analisis Pengaruh Komposisi Unsur Paduan Si Dan Zn terhadap Lapisan Oksida pada Paduan Titanium Ti-6Al-4V dengan Metode Plasma Electrolytic Oxidation

Isty, Yuridha (2026) Analisis Pengaruh Komposisi Unsur Paduan Si Dan Zn terhadap Lapisan Oksida pada Paduan Titanium Ti-6Al-4V dengan Metode Plasma Electrolytic Oxidation. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Paduan titanium Ti-6Al-4V banyak digunakan sebagai material implan karena ringan, kuat, dan tahan korosi, namun sifatnya yang relatif bioinert dapat membatasi sifat osseointegrasi. Penelitian ini meningkatkan bioaktivitas permukaan dengan membentuk lapisan oksida keramik berpori melalui Plasma Electrolytic Oxidation (PEO) sekaligus menginkorporasikan ion bioaktif dari elektrolit. PEO dilakukan menggunakan elektrolit berbasis kalsium–fosfat (target rasio Ca/P mendekati 1,67) sebagai baseline, kemudian ditambahkan Sr, serta divariasikan kadar Si (1, 3, 5%) dan Zn (1, 3, 5%). Karakterisasi meliputi OES untuk verifikasi komposisi substrat, XRD untuk identifikasi fase, SEM-EDX untuk morfologi dan komposisi unsur, SEM cross section untuk struktur penampang lapisan, uji pull-off untuk adhesion strength, serta uji MTT untuk viabilitas sel. Hasil menunjukkan PEO berhasil membentuk lapisan oksida berpori dan menginkorporasikan unsur Ca–P serta (Sr/Si/Zn) pada permukaan. Inkorporasi Si, Sr, dan Zn pada lapisan PEO dilakukan untuk meningkatkan bioaktivitas permukaan, di mana Si mendukung mineralisasi, Sr meningkatkan viabilitas sel, dan Zn memberikan efek antibakteri. Peningkatan kadar dopan Si dan Zn cenderung meningkatkan ukuran pori dan porositas, yang mengindikasikan perubahan intensitas microdischarge selama proses PEO. Hasil menunjukkan PEO berhasil membentuk lapisan oksida berpori dan menginkorporasikan unsur Ca–P serta Sr/Si/Zn pada permukaan. Peningkatan kadar Si dan Zn cenderung meningkatkan ukuran pori dan porositas yang menunjukkan perubahan karakter microdischarge selama proses PEO. Penampang lapisan memperlihatkan struktur bergradasi, yaitu bagian luar lebih kasar dan berpori, sedangkan bagian dalam lebih kompak. Secara biologis, seluruh variasi menunjukkan viabilitas sel tinggi (≥85%), dengan hasil terbaik pada sistem berbasis Sr–Si kadar rendah–menengah (1Si–3Si) sebesar 93,01%, sedangkan Zn kadar tinggi cenderung menurunkan viabilitas meskipun masih dalam rentang tidak sitotoksik. Kesimpulannya, modifikasi elektrolit Ca–P dengan penambahan Sr dan Si rendah–menengah memberikan kombinasi karakter permukaan dan respons biologis yang paling baik untuk pelapisan implan Ti-6Al-4V.
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The Ti-6Al-4V titanium alloy is widely used as an implant material due to its light weight, high strength, and corrosion resistance; however, its relatively bioinert nature can limit its osseointegration capability. This study enhances surface bioactivity by forming a porous ceramic oxide layer through Plasma Electrolytic Oxidation (PEO) while simultaneously incorporating bioactive ions from the electrolyte. PEO was performed using a calcium–phosphate–based electrolyte (target Ca/P ratio ~1.67) as the baseline, followed by the addition of Sr, and further variation of Si (1, 3, 5%) and Zn (1, 3, 5%) concentrations. Characterization included OES for substrate composition verification, XRD for phase identification, SEM-EDX for surface morphology and elemental composition, SEM cross-section imaging for layer structure, pull-off testing for adhesion strength, and the MTT assay for cell viability. The results show that PEO successfully produced a porous oxide layer and incorporated Ca–P as well as Sr/Si/Zn elements into the surface. Incorporation of Si, Sr, and Zn into the PEO layer was intended to enhance surface bioactivity, where Si promotes mineralization, Sr improves cell viability, and Zn provides antibacterial effects. Increasing Si and Zn dopant concentrations tended to increase pore size and porosity, indicating changes in microdischarge intensity during the PEO process. Cross-sectional observations revealed a graded-layer structure, with a rough and porous outer region and a denser inner region. Biologically, all variations exhibited high cell viability (≥85%), with the best performance observed in the Sr–Si–based system at low–medium Si concentrations (1Si–3Si), reaching 93.01%, whereas high Zn levels tended to reduce viability although still within a non-cytotoxic range. In conclusion, modification of the Ca–P electrolyte with the addition of low–medium Sr and Si provides the most favorable combination of surface characteristics and biological response for coating Ti-6Al-4V implants.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bioaktivitas, Plasma Electrolytic Oxidation (PEO), Ti-6Al-4V, Bioactivity, Plasma Electrolytic Oxidation (PEO), Ti-6Al-4V
Subjects:	Q Science Q Science > QD Chemistry > QD63.O9 Electrolytic oxidation. R Medicine > RD Surgery > RD755.5.C35 Orthopedic implants.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Yuridha Isty Isty
Date Deposited:	26 Jan 2026 07:20
Last Modified:	26 Jan 2026 07:20
URI:	http://repository.its.ac.id/id/eprint/130347

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