AHMAD FAISHAL, . (2026) PENGARUH VARIASI ALUMINIUM (AL) TERHADAP LAJU KOROSI PADUAN MG-AL-1,2ZN SEBAGAI MATERIAL IMPLAN. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
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Abstract
Penelitian ini mengkaji pengaruh variasi kandungan aluminium (Al) sebesar 3%, 4,5%, dan 6% terhadap laju korosi dan sifat mekanik paduan Mg-Al-1,2Zn sebagai material implan tulang biodegradable. Paduan dibuat melalui proses pengecoran logam dengan komposisi dasar tetap 1,2% Zn, dilanjutkan homogenisasi pada suhu 400°C selama 4 jam. Pengujian korosi dilakukan secara in-vitro menggunakan larutan ringer laktat pada suhu 37°C dengan metode polarisasi sesuai ASTM G59, sedangkan sifat mekanik dianalisis menggunakan uji tarik standar ASTM E8. Hasil penelitian menunjukkan bahwa peningkatan kadar Al secara signifikan menurunkan laju korosi dari 2,164 mmpy (3% Al) menjadi 1,6479 mmpy (4,5% Al) dan 0,81386 mmpy (6% Al). Penurunan ini disebabkan oleh pembentukan lapisan oksida/hidroksida campuran Mg-Al yang lebih stabil dan protektif di permukaan paduan, yang bertindak sebagai penghalang korosi. Namun, penambahan Al di atas 3% menurunkan kekuatan tarik dari rata-rata 156,076 MPa (3% Al) menjadi 126,56 MPa (4,5% Al) dan 145,923 MPa (6% Al), serta mengurangi keuletan (elongasi turun dari 13,463% menjadi 6,943%). Analisis statistik menggunakan uji ANOVA satu arah menunjukkan bahwa variasi aluminium berpengaruh signifikan terhadap laju korosi dibandingkan dengan tanpa aliminium. Secara keseluruhan, paduan dengan 6% Al menunjukkan ketahanan korosi terbaik, sedangkan komposisi 3% Al memberikan keseimbangan optimal antara kekuatan mekanik dan degradasi terkendali, sehingga berpotensi sebagai material implan biodegradable. Kata kunci: Aluminium (Al), laju korosi, magnesium (Mg), pengecoran, uji tarik. ***** This study examines the effect of aluminum (Al) content variations of 3%, 4.5%, and 6% on the corrosion rate and mechanical properties of Mg-Al-1.2Zn alloy as a biodegradable bone implant material. The alloy was fabricated through metal casting with a fixed base composition of 1.2% Zn, followed by homogenization at 400°C for 4 hours. Corrosion testing was conducted in-vitro using Ringer's lactate solution at 37°C with the polarization method according to ASTM G59, while mechanical properties were analyzed using the standard tensile test ASTM E8. Results show that increasing Al content significantly reduces the corrosion rate from 2.164 mmpy (3% Al) to 1.6479 mmpy (4.5% Al) and 0.81386 mmpy (6% Al). This reduction is attributed to the formation of a more stable and protective mixed Mg-Al oxide/hydroxide layer on the alloy surface, which acts as a corrosion barrier. However, Al addition above 3% decreases tensile strength from an average of 156.076 MPa (3% Al) to 126.56 MPa (4.5% Al) and 145.923 MPa (6% Al), and reduces ductility (elongation decreased from 13.463% to 6.943%). Statistical analysis using one-way ANOVA revealed that Al variation significantly on the corrosion rate compared to without aluminum.. Overall, the alloy with 6% Al exhibits the best corrosion resistance, while the 3% Al composition offers an optimal balance between mechanical strength and controlled degradation, demonstrating potential as a biodegradable implant material. Keywords: Aluminum (Al), casting, corrosion rate, magnesium (Mg), tensile strength
| Item Type: | Thesis (Sarjana) |
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| Additional Information: | 1). Dr. Eng. Agung Premono, M.T. ; 2). Dr. Eng. I Wayan Sugita, M.T. |
| Subjects: | Teknologi dan Ilmu Terapan > Teknik Mesin, Mekanika Teknik |
| Divisions: | FT > S1 Teknik Mesin |
| Depositing User: | Users 32564 not found. |
| Date Deposited: | 02 Feb 2026 03:37 |
| Last Modified: | 02 Feb 2026 03:37 |
| URI: | http://repository.unj.ac.id/id/eprint/64011 |
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