SAPUTRI, DILA BAYU (2020) ANALISIS LAJU KOROSI LOGAM PADUAN ALUMINIUM 7075-T6 SEBAGAI MATERIAL FRAME PADA KARGO PESAWAT B737-800 DALAM MEDIA AIR LAUT MENGGUNAKAN METODE KEHILANGAN MASSA. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Aluminum alloy 7075-T6 is a material that has the higher strength compared to the other aluminum alloys which has the ultimate tensile strength reaches 572 Mpa. AA 7075-T6 is mostly used in the aviation industry, like manufacturing aircraft components such as wing panels, tail areas (stabilizers), frames, stringers and other parts that require high strength. The frame is one of the aircraft's primary structures that carries all loads, as well as aircraft pressure loads when flying and on ground. The frames are coiled along the fuselage including the cargo compartment, if it fails will cause an unsafe condition that would affect the airworthiness of the aircraft. One of the contributing factors is corrosion in the cargo frame, where if this corrosion is severe it can trigger crack which endanger aircraft safety while flying. Because of corrosion is often found on B737-800 aircraft cargo frames, so this research was conducted to determine the rate of corrosion in the aircraft cargo frame material using the weight loss method. The research process was carried out by immersing the specimens in seawater, with an immersion time of 168 hours, 336 hours and 504 hours at room temperature (300 K) and ice temperature (255 K). The results showed the largest corrosion rate occurred at 504 hours immersion time, ie 0.05817 mg/cm2 hours at room temperature and 0.09272 mg/cm2 hours at ice temperature. Then the surface morphology of the specimens was analyzed before and after the immersion using SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-ray). The results of SEM-EDX showed the changes in the surface morphology and the percentage of aluminum element content of the specimens to 78.61% at room temperature and 72.81% at ice temperature compared to the specimens without immersion is 90.60%. Keywords: Aluminum alloy 7075-T6, cargo frame, corrosion rate, weight loss method, SEM-EDX Paduan aluminium 7075-T6 merupakan material yang memiliki kekuatan lebih tinggi dibandingkan paduan aluminium lainnya, yaitu memiliki ultimate tensile strength mencapai 572 Mpa. AA 7075-T6 ini banyak digunakan pada industri penerbangan yaitu pembuatan komponen pesawat terbang seperti wing panel, tail area (stabilizer), frame, stringer dan bagian-bagian lain yang membutuhkan kekuatan tinggi. Frame merupakan salah satu primary structure pesawat yang mengangkut seluruh beban, maupun beban tekanan pesawat pada saat terbang dan di darat. Frame melingkar di seluruh badan pesawat (fuselage) termasuk kompartemen kargo, jika frame mengalami kerusakan maka dapat mengakibatkan kondisi tidak aman pada pesawat yang dapat berpengaruh terhadap airworthiness pesawat tersebut. Salah satu faktor penyebabnya yaitu korosi pada frame tersebut, dimana jika korosi ini parah maka dapat memicu crack sehingga membahayakan keselamatan pesawat saat terbang. Seringnya ditemukan korosi pada frame kargo pesawat B737-800, maka penelitian ini dilakukan untuk mengetahui laju korosi pada material frame kargo pesawat tersebut menggunakan metode kehilangan massa. Pengujian dilakukan dengan proses perendaman logam uji di dalam air laut, dengan waktu perendaman 168 jam, 336 jam dan 504 jam pada suhu ruang (300 K) dan suhu es (255 K). Hasil pengujian menunjukkan laju korosi terbesar terjadi pada waktu perendaman 504 jam, yaitu 0,05817 mg/cm2 jam pada suhu ruang dan 0,09272 mg/cm2 jam pada suhu es. Kemudian dianalisa morfologi permukaan logam uji sebelum dan setelah perendaman menggunakan SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-ray). Hasil SEM-EDX menunjukkan adanya perubahan morfologi permukaan dan persentase unsur aluminium logam uji menjadi 78,61% pada suhu ruang dan 72,81% pada suhu es dibandingkan logam uji tanpa perendaman yaitu 90,60%. Kata kunci: Paduan aluminium 7075-T6, frame kargo, laju korosi, metode kehilangan massa, SEM-EDX.
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