Analisis Pengaruh Variasi Kadar Unsur Cerium Dan Temperatur Larutan NaCl 2,9% Terhadap Efisensi Anoda Korban Paduan Aluminium

Firmansyah, Mohammad Khafidz Danil (2024) Analisis Pengaruh Variasi Kadar Unsur Cerium Dan Temperatur Larutan NaCl 2,9% Terhadap Efisensi Anoda Korban Paduan Aluminium. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan logam dalam kehidupan sehari-hari akan mengakibatkan suatu logam bereaksi dengan udara ataupun air sehingga dapat terserang korosi dan mengalami kegagalan. Pengendalian terhadap korosi diperlukan untuk mengontrol dan meminimalisir laju korosi. Metode yang sering digunakan untuk menghambat laju korosi adalah melakukan proteksi katodik dengan menggunakan anoda korban. Anoda korban aluminium cocok digunakan pada lingkungan yang berair, namun diperlukan penambahan paduan lain untuk meningkatkan kinerja anoda korban aluminium. Penelitian ini bertujuan untuk menganalisis pengaruh unsur tanah jarang Cerium 2%, 2.5%, 3% terhadap efisiensi anoda korban aluminium pada larutan 2,9% NaCl dengan variasi temperatur 25oC dan 35oC. Pengecoran dilakukan untuk mendapatkan paduan anoda korban aluminium dan cerium. Setelah dilakukan pengecoran, efek penambahan cerium dianalisis dengan beberapa pengujian diantaranya adalah Atomic Absorption Spectrophotometer (AAS), X-Ray Diffraction (XRD), Scanning Electron Microscopy - Energy Dispersive X-Ray (SEM-EDX), Metalografi, Potensiotat, dan Uji Efisiensi Anoda dengan standar DNVGL-RP-B401. Pengujian menunjukkan bahwa cerium menghaluskan butir pada paduan aluminium. Penambahan cerium pada paduan aluminium menyebabkan pembentukan senyawa Al11Ce3. Laju korosi sampel Al-0Ce, Al-2Ce, Al-2.5Ce, dan Al-3Ce masing-masing adalah 0,075, 0,1033, 0,5815, dan 0,647 mm per tahun. Seiring penambahan cerium pada paduan aluminium menyebabkan ukuran butir semakin kecil sehingga laju korosi meningkat. Batas butir yang semakin besar menyebabkan aktifitas elektrokimianya meningkat, yang membuat anoda korban lebih aktif untuk melindungi katoda. Berdasarkan pengujian efisiensi anoda korban didapatkan bahwa efisiensi anoda korban menurun seiring dengan penambahan cerium. Pada temperatur perendaman 25oC, untuk sampel Al-0Ce, Al-2Ce, Al-2.5Ce, dan Al-3Ce mengalami penurunan efisiensi masing-masing 89,2, 76,1, 74,6, dan 72,2%. Hal yang sama juga terjadi pada temperatur perendaman 35oC dimana sampel Al-0Ce, Al-2Ce, Al-2.5Ce, dan Al-3Ce juga mengalami penurunan efisiensi yaitu 87,3, 74, 73, dan 71,3%. Temperatur yang lebih tinggi dapat menyebabkan ion klorida bergerak lebih aktif, menyebabkan perpindahan elektron lebih cepat dan korosi lebih mudah menyerang. Akibatnya, efisiensi turun.
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The use of metal in daily life will cause the metal to react with air or water so that it can be attacked by corrosion and fail. Corrosion control is needed to control and minimize the corrosion rate. The method often used to inhibit the rate of corrosion is cathodic protection using a sacrificial anode. Aluminum sacrificial anodes are suitable for use in watery environments, but the addition of other alloys is required to improve the performance of aluminum sacrificial anodes. This research aims to analyze the effect of the rare earth element Cerium 2.5%, 3%, 3.5% on the efficiency of aluminum sacrificial anodes in 2,9% NaCl solutions with temperature variations 25oC and 35oC. Casting is carried out to obtain a sacrificial anode alloy of aluminum and cerium. After casting, the effect of adding cerium was analyzed using several tests including Atomic Absorption Spectrophotometer (AAS), X-Ray Diffraction (XRD), Scanning Electron Microscopy - Energy Dispersive X-Ray (SEM-EDX), Potentiostat, and Anode Efficiency Test to the DnVGL-RPB401 Standard. Tests show that cerium refines the grains in aluminum alloys. The addition of cerium to the aluminum alloy led to the formation of the Al11Ce3 compound. The corrosion rates of Al-0Ce, Al-2Ce, Al-2.5Ce, and Al-3Ce samples were 0.075, 0.1033, 0.5815, and 0.647 mm per year, respectively. As the addition of cerium to the aluminum alloy causes the grain size to get smaller, the corrosion rate increases. The larger grain boundary causes its electrochemical activity to increase, which makes the sacrificial anode more active to protect the cathode. Based on the sacrificial anode efficiency test, it was found that the sacrificial anode efficiency decreased with the addition of cerium. At 25oC immersion temperature, the Al-0Ce, Al-2Ce, Al-2.5Ce, and Al-3Ce samples experienced a decrease in efficiency of 89.2, 76.1, 74.6, and 72.2%, respectively. The same thing also happened at 35oC immersion temperature where the Al-0Ce, Al-2Ce, Al-2.5Ce, and Al-3Ce samples also experienced a decrease in efficiency, namely 87.3, 74, 73, and 71.3%. Higher temperatures can cause chloride ions to move more actively, causing faster electron transfer and corrosion to attack more easily. As a result, the efficiency drops.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Aluminium, Cerium, Efficiency, Grain, Sacrificial Anode, Anoda Korban, Butir, Efisiensi
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Mohammad Khafidz Danil Firmansyah
Date Deposited:	05 Feb 2024 07:52
Last Modified:	05 Feb 2024 07:52
URI:	http://repository.its.ac.id/id/eprint/106103

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