GILBRAN VIRGIAWAN, . (2025) PENGARUH VARIASI PENAMBAHAN SERBUK MG PADA AL DENGAN DAN TANPA DIBUNGKUS ALUMINIUM FOIL SAAT PROSES PENGECORAN TERHADAP KOMPOSISI YANG TERBENTUK SERTA LAJU KOROSI DALAM LARUTAN 3,5% NACL. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
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Abstract
Paduan AlMg banyak digunakan dalam industri kelautan, otomotif, dan dirgantara karena ringan, kuat, serta memiliki ketahanan korosi yang baik. Namun, proses pengecoran paduan ini sering kali menghadapi tantangan berupa oksidasi magnesium yang tinggi, yang dapat menyebabkan ketidaksesuaian komposisi dan menurunkan kualitas paduan. Oleh karena itu, dilakukan penelitian untuk mengevaluasi pengaruh variasi penambahan serbuk magnesium (2 wt.%, 5 wt.%, 10 wt.%) serta perlakuan pembungkusan menggunakan aluminium foil terhadap komposisi akhir paduan dan ketahanan korosi dalam larutan 3,5% NaCl. Penelitian dilakukan dengan metode eksperimen melalui pengecoran gravitasi, menggunakan aluminium batangan dan serbuk magnesium, dengan sebagian serbuk dibungkus aluminium foil untuk mengurangi oksidasi. Komposisi hasil pengecoran dianalisis menggunakan X-Ray Fluorescence (XRF), sementara ketahanan korosi diuji menggunakan metode weight loss selama 60 hari dengan pengukuran massa pada interval waktu 1440 jam. Hasil menunjukkan bahwa pembungkusan magnesium tidak secara signifikan mengurangi oksidasi, dengan kandungan Mg aktual yang relatif serupa atau bahkan sedikit lebih rendah dibanding tanpa pembungkus. Sementara itu, semakin tinggi kandungan magnesium, laju korosi juga meningkat, di mana Al2Mg–f menunjukkan ketahanan korosi terbaik. Paduan dengan kadar Mg rendah terbukti lebih stabil terhadap korosi dalam simulasi lingkungan laut, sehingga lebih direkomendasikan untuk aplikasi maritim seperti lambung kapal, dek, dan sistem perpipaan pada lingkungan laut korosif. Kata kunci: ketahanan laut, metode weight loss, pengecoran gravitasi, XRF, flaring magnesium. ***** Al-Mg alloys are widely used in the marine, automotive, and aerospace industries due to their light weight, high strength, and excellent corrosion resistance. However, the casting process of these alloys often faces challenges related to the high oxidation tendency of magnesium, which can lead to compositional deviations and reduced alloy quality. Therefore, this study aims to evaluate the effect of varying magnesium powder additions (2 wt.%, 5 wt.%, 10 wt.%) and the use of aluminum foil wrapping treatment on the final alloy composition and corrosion resistance in a 3.5% NaCl solution. The research was carried out using an experimental method through gravity casting, utilizing aluminum ingots and magnesium powder, with some of the powder wrapped in aluminum foil to minimize oxidation. The resulting alloy compositions were analyzed using X-Ray Fluorescence (XRF), while corrosion resistance was tested using the weight loss method over a period of 60 days, with mass measurements taken at 1440 hours. The results showed that wrapping magnesium with aluminum foil did not significantly reduce oxidation, as the actual magnesium content was relatively similar or slightly lower compared to unwrapped samples. Additionally, a higher magnesium content led to increased corrosion rates, with the Al2Mg–f sample exhibiting the best corrosion resistance. Alloys with lower magnesium content proved to be more chemically stable against corrosion in simulated marine environments, making them more suitable for maritime applications such as ship hulls, decks, and piping systems exposed to seawater. Keywords: marine resistance, weight loss method, gravity casting, XRF, magnesium flaring.
Item Type: | Thesis (Sarjana) |
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Additional Information: | 1). Dr. Ferry Budhi Susetyo, M.T., M.Si. ; 2). Drs. H. Syamsuir, M.T. |
Subjects: | Teknologi dan Ilmu Terapan > Teknik Pertambangan, Metalurgi Teknologi dan Ilmu Terapan > Manufaktur |
Divisions: | FT > D IV Teknologi Rekayasa Manufaktur |
Depositing User: | Gilbran Virgiawan . |
Date Deposited: | 31 Jul 2025 02:54 |
Last Modified: | 31 Jul 2025 02:54 |
URI: | http://repository.unj.ac.id/id/eprint/57022 |
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