Dewi, Clarissa Kirana (2024) Analisis Pengaruh Variasi Penambahan Unsur Cerium Terhadap Efisiensi Anoda Korban Paduan Aluminium Dalam Larutan NaCl 3.38% Dengan Temperatur yang Berbeda. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Ion klorida merupakan salah faktor penyebab korosi karena memiliki radius kecil serta penetrasi kuat, sehingga dapat merusak lapisan oksida pada permukaan logam dan mempercepat laju korosinya. Proteksi yang efektif digunakan pada lingkungan yang mengandung ion klorida adalah proteksi katodik dengan anoda korban. Anoda korban yang banyak diproduksi adalah anoda korban dengan bahan dasar aluminium. Namun, anoda korban aluminium murni memiliki kecenderungan membentuk lapisan pasif. Oleh karena itu, tujuan dari penelitian ini adalah untuk menganalisis pengaruh penambahan unsur tanah jarang cerium terhadap mikrostruktur anoda korban aluminium dan menganalisis pengaruh penambahan unsur tanah jarang cerium sejumlah 2%, 2.5%, 3% terhadap efisiensi anoda korban di larutan 3.38% NaCl dengan variasi temperatur. Untuk mendapatkan paduan aluminium dan cerium, penelitian memerlukan proses pengecoran. Untuk mendukung penelitian diperlukan beberapa pengujian yaitu Atomic Absorption Spectrophotometry (AAS), X-Ray Diffraction (XRD), Scanning Electron Microscopy dan Energy Dispersive X-Ray (SEM-EDX), Metalografi, Potensiotat dan Uji Efisiensi Anoda dengan standar DNVGL-RP-B401. Berdasarkan pengujian didapatkan hasil bahwa semakin bertambahnya cerium menyebabkan halusnya butir pada paduan. Penambahan cerium pada paduan aluminium menyebabkan terbentuknya senyawa Al11Ce3. Apabila ditinjau dari laju korosi bagi sampel Al-0Ce, Al-2Ce, Al-2.5Ce, dan Al-3Ce dengan nilai masing-masing 0,075, 0,1033, 0,5815, dan 0,647 mm/year. Laju korosi meningkat seiring dengan bertambahnya cerium diakibatkan karena butir yang semakin kecil yang mengakibatkan batas butir semakin banyak. Batas butir yang semakin meningkat menyebabkan aktifitas elektrokimianya semakin naik dan menyebabkan anoda korban lebih aktif untuk melindungi katoda. Uji efisiensi anoda korban dilakukan dengan standar DNVGL-RP-B401, didapatkan bahwa efisiensi anoda korban berkurang seiring dengan bertambahnya cerium. Dalam temperatur 250C, efisiensi anoda korban menurun masing-masing untuk sampel Al-0Ce, Al-2Ce, Al-2.5Ce, dan Al-3Ce berturut-turut adalah 89,6, 73,9, 70,8, dan 69,6%. Penurunan efisiensi terjadi juga pada temperatur 350C untuk masing-masing sampel Al-0Ce, Al-2Ce, Al-2.5Ce, dan Al-3Ce berturut-turut adalah 86,6, 71,6, 70,4, dan 68,5%. Efisiensinya menurun disebabkan karena semakin tingginya temperatur dapat menyebabkan pergerakan ion klorida semakin aktif sehingga perpindahan elektron semakin cepat terjadi dan korosi lebih mudah menyerang.
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Chloride ions are one of the factors that cause corrosion because they have a small radius and strong penetration, so they can damage the oxide layer on the metal surface and accelerate the corrosion rate. Effective protection used in environments containing chloride ions is cathodic protection with sacrificial anodes. The widely produced sacrificial anodes are aluminum-based sacrificial anodes. However, pure aluminum sacrificial anodes have a tendency to form a passive layer. Therefore, the purpose of this study is to analyze the effect of the addition of rare earth element cerium on the microstructure of aluminum sacrificial anodes and analyze the effect of the addition of rare earth element cerium in the amount of 2%, 2.5%, 3% on the efficiency of sacrificial anodes in 3.38% NaCl solution with temperature variations. To obtain aluminum and cerium alloys, the research requires a casting process. To support the research, several tests are needed, namely Atomic Absorption Spectrophotometry (AAS), X-Ray Diffraction (XRD), Scanning Electron Microscopy and Energy Dispersive X-Ray (SEM-EDX), Metallography, Potentiotate and Anode Efficiency Test with DNVGL-RP-B401 standard. Based on the test, the results show that the increase in cerium causes the smoothness of the grains in the alloy. The addition of cerium to aluminum alloys causes the formation of the Al11Ce3 compound. When viewed from the corrosion rate for Al-0Ce, Al-2Ce, Al-2.5Ce, and Al-3Ce samples with values of 0.075, 0.1033, 0.5815, and 0.647 mm/year, respectively. The corrosion rate increases with the increase of cerium due to the smaller grains which result in more grain boundaries. The increasing grain boundaries cause the electrochemical activity to increase and cause the sacrificial anode to be more active to protect the cathode. The sacrificial anode efficiency test was carried out with the DNVGL-RP-B401 standard, it was found that the sacrificial anode efficiency decreased with the increase of cerium At 250C, the sacrificial anode efficiency decreased for Al-0Ce, Al-2Ce, Al-2.5Ce, and Al-3Ce samples to 89.6, 73.9, 70.8, and 69.6%, respectively. The decrease in efficiency also occurred at 350C for each of the Al-0Ce, Al-2Ce, Al-2.5Ce, and Al-3Ce samples which were 86.6, 71.6, 70.4, and 68.5%, respectively. The efficiency decreases because the higher temperature can cause the movement of chloride ions to be more active so that electron transfer occurs faster and corrosion is easier to attack.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Anoda Korban, Aluminium, Cerium, Efisiensi, Mikrostruktur, Sacrificial Anode, Aluminium, Cerium, Efficiency, Microstructure |
| 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 T Technology > TA Engineering (General). Civil engineering (General) > TA462 Metal Corrosion and protection against corrosion 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: | Clarissa Kirana Dewi |
| Date Deposited: | 05 Feb 2024 04:30 |
| Last Modified: | 05 Feb 2024 04:30 |
| URI: | http://repository.its.ac.id/id/eprint/106079 |
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