Pengaruh Waktu Oksidasi Terhadap Morfologi dan Kekerasan Lapisan Al2O3 Pada Aluminium 2024 Menggunakan Metode Plasma Electrolytic Oxidation

Renaldi, Irvan Kaisar (2018) Pengaruh Waktu Oksidasi Terhadap Morfologi dan Kekerasan Lapisan Al2O3 Pada Aluminium 2024 Menggunakan Metode Plasma Electrolytic Oxidation. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan logam ringan, seperti paduan aluminium mulai meningkat dalam berbagai bidang, penggunaan aluminium untuk kebutuhan material struktural sendiri secara perlahan aluminium mulai menggantikan baja dalam banyak penggunaan, tetapi karena sifat aluminium yang tidak sekuat baja perlu diberikan perlakuan untuk meningkatkan sifatnya, salah satunya Plasma Electrolytic Oxidation (PEO), PEO merupakan jenis rekayasa permukaan seperti anodising, hanya saja menggunakan tegangan yang lebih besar dan lebih ramah lingkungan. Pada penelitian kali ini dilakukan penelitian pengaruh waktu terhadap morfologi lapisan alumina substrat aluminium 2024 yang dilakukan proses PEO sehingga dapat dianalisa pengaruh waktu terhadap morfologi dan kekerasan dari lapisan substrat aluminium 2024. PEO yang dilakukan dengan variabel waktu 10 menit hingga 40 menit menggunakan tegangan 260V DC, dan di dapat rapat arus sebesar 151 – 303mA/cm2. Pada karakterisasi yang dilakukan dengan menggunakan SEM didapat struktur crater dan struktur nodular dimana struktur crater akan semakin membesar dengan semakin lamanya waktu PEO serta pada hasil EDX dengan semakin lamanya waktu oksidasi didapatkan komposisi aluminium oksida yang semakin tinggi, pada karakterisasi XRD yang dilakukan semakin lamanya waktu oksidasi PEO akan menghasilkan fasa γ–Al2O3 dan mullite. Dengan terbentuknya lapisan alumina menghasilkan kekerasan yang tinggi mencapai 896,2 HV untuk proses PEO dengan waktu oksidasi 40 menit.============================================================================================================The usage of light alloys, such as aluminium alloys tend to increase in various sectors, the usage of aluminium for structural material itself gradually replacing steel in many sectors, due to the weakness of aluminium itself there were some treatment to increase its mechanichal and other properties, such as Plasma Electrolytic Oxidation (PEO), PEO is a type of surface engineering similar to anodizing but the voltage employed is much higher and also more environmentally friendly. In this research there was investigated the effect of oxidation time to the morphology and hardness of alumina layer from aluminium 2024 substrate with PEO process, so it could be analyzed the effect of oxidation time to morphology and hardness of alumina layer. The PEO process was varied from 10 minutes until 40 minutes using voltage of 260V DC and current density ranged from to 151 to 303mA/cm2. The SEM characterization resulted in nodular structure and crater-like structure that increasing by the longer time of oxidation time, also EDX shows the composition of aluminium oxide was increasing by the longer time of oxidation time, the XRD characterization resulted in the longer oxidation time of PEO treatment resulted in dominant Al2O3 and mullite phase. With the alumina layer formed will generate high hardness reach up to 896.2 HV for PEO process with 40 minutes oxidation time.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt Put p
Uncontrolled Keywords: Plasma Electrolytic Oxidation, Micro Arc Oxidation, Waktu Oksidasi, Aluminium 2024
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TP Chemical technology > TP255 Electrochemistry, Industrial.
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Irvan Kaisar Renaldi
Date Deposited: 19 Feb 2018 07:56
Last Modified: 19 Feb 2018 07:56
URI: http://repository.its.ac.id/id/eprint/49304

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