Analisis Pengaruh Penambahan Variasi Kadar Rendah Unsur Cerium dan Temperatur Larutan NaCl 2,9% Terhadap Efisiensi Anoda Korban Paduan Aluminium

Sulaiman, Fadjar Alam (2024) Analisis Pengaruh Penambahan Variasi Kadar Rendah Unsur Cerium dan Temperatur Larutan NaCl 2,9% Terhadap Efisiensi Anoda Korban Paduan Aluminium. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi adalah suatu proses penguraian atau kerusakan material yang disebabkan oleh reaksi kimia dengan lingkungan sekitarnya. Salah satu upaya untuk mengendalikan korosi di lingkungan perairan adalah menggunakan anoda korban. Aluminium merupakan salah satu anoda korban yang cocok digunakan di lingkungan perairan. Akan tetapi, diperlukan penambahan unsur lain untuk memaksimalkan kinerja dari anoda korban aluminium. Tujuan dari dilakukannya penelitian ini adalah untuk menganalisis pengaruh penambahan logam tanah jarang Cerium dengan variasi 0,5, 1, dan 1,5% terhadap mikrostruktur anoda korban aluminium dan menganalisis pengaruh penambahan logam tanah jarang Cerium dengan variasi 0,5, 1, dan 1,5% pada media perendaman NaCl dengan kadar 2,9% dengan variasi temperatur 25°C dan 35°C terhadap efisiensi anoda korban aluminium. Adapun langkah-langkah yang dilakukan adalah melakukan pengecoran dengan tujuan untuk menambahkan cerium terhadap paduan aluminium, setelah itu dilakukan 6 pengujian yaitu Atomic Absorption Spectroscopy (AAS), XRay Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), Metalografi, Potensiotat, dan Efisiensi anoda korban yang menggunakan standar DnVGLRPB401. Berdasarkan pengujian yang telah dilakukan, didapatkan bahwa penambahan unsur cerium dapat menyebabkan mengecilnya ukuran butir dan mikrostruktur yang lebih halus. Selama proses solidifikasi, terbentuk senyawa intermetalik αAl11Ce3 dan Al2CeZn2 pada batas butir. Hasil pengujian efisiensi anoda korban pada setiap sampel (Al-0wt%Ce, Al-0,5wt%Ce, Al-1wt%Ce, dan Al-1,5wt%Ce) dengan variasi temperatur 25°C secara berurutan adalah 89,1, 85,92, 81,2, 76,71%. Sedangkan efisiensi anoda korban dengan variasi temperatur 35°C adalah 87,23, 83,19, 79,14, 75,09%. Penurunan efisiensi disebabkan karena semakin banyaknya kadar cerium maka akan mengaktivasi anoda korban paduan aluminium yang ditandai denganterbentuknya korosi seragam. Selain itu, semakin tingginya temperatur maka akan meningkatkan afinitas elektron yang dapat mengaktivasi anoda korban paduan aluminium yang ditandai dengan meningkatnya difusi ion Cl-.
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Corrosion is a process of material decomposition or damage caused by chemical reactions with the surrounding environment. One of the efforts to control corrosion in the aquatic environment is to use sacrificial anodes. Aluminium is one of the suitable for use in aquatic environments. However, the addition of other elements is needed to maximize the performance of aluminium sacrificial anodes. The purpose of this research is to analyze the effect of the addition of rare earth metal cerium with variations of 0.5, 1, and 1.5% to the microstructure of aluminum sacrificial anodes and analyze the effect of the addition of rare earth metal cerium with variations of 0.5, 1, and 1.5% immersion in NaCl with a level of 2.9% with temperature variations of 25°C and 35°C on the efficiency of aluminum sacrificial anodes. The steps taken are to perform casting with the aim of adding cerium to aluminum alloys, after which 6 tests were conducted, namely Atomic Absorption Spectroscopy (AAS), X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), Metallography, Potentiotate, and Efficiency of sacrificial anodes using DnVGL-RPB401 standards. Based on the tests conducted, it was found that the addition of cerium can lead to a reduction in grain size and a finer microstructure. During the solidification process, intermetallic compounds αAl11Ce3 and Al2CeZn2 are formed at the grain boundaries. The test results of sacrificial anode efficiency on each sample (Al-0wt%Ce, Al-0.5wt%Ce, Al-1wt%Ce, and Al-1.5wt%Ce) with a temperature variation of 25°C are 89.1, 85.92, 81.2, 76.71%. While the efficiency of the sacrificial anode with a temperature variation of 35 ° C is 87.23, 83.19, 79.14, 75.09%. The decrease in efficiency is due to the increasing levels of cerium, which will activate the aluminum alloy sacrificial anode characterized by the formation of uniform corrosion. In addition, the higher temperature will increase the affinity of electrons that can activate the aluminum alloy sacrificial anode characterized by increased diffusion of Cl- ions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Aluminium, Anoda Korban, Cerium, Korosi, Temperatur ============================================================ Aluminum, Cerium, Corrosion, Sacrificial anode, Temperature
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA480.A6 Aluminum alloys.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Fadjar Alam Sulaiman
Date Deposited:	06 Aug 2024 06:31
Last Modified:	06 Aug 2024 06:31
URI:	http://repository.its.ac.id/id/eprint/111062

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