Analisis Pengaruh Unsur Tanah Jarang Ytterbium Dan Kadar NaCl Terhadap Efisiensi Anoda Korban Di Lingkungan Air Laut

Azra, Banindra Alvin Farial (2023) Analisis Pengaruh Unsur Tanah Jarang Ytterbium Dan Kadar NaCl Terhadap Efisiensi Anoda Korban Di Lingkungan Air Laut. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ion klorida tergolong sebagai ion katalitik yang mampu mempercepat laju korosi yang dapat mengakibatkan berbagai macam kerugian pada permukaan besi dan baja seperti berkurangnya umur pakai, massa, ketebalan dan kinerja dari logam tersebut. Untuk melindungi logam tersebut, dibutuhkan proteksi katodik yang merupakan proteksi unggul di lingkungan air laut karena kapasitas arusnya yang memadai, kepraktisan dan biayanya yang murah. Penelitian ini bertujuan menganalisis pengaruh penambahan unsur tanah jarang ytterbium sejumlah 1, 2, dan 3% dan kadar NaCl terhadap efisiensi anoda korban di lingkungan 3 dan 3,5% NaCl. Untuk mendapatkan paduan aluminium dan ytterbium, penelitian memerlukan proses pengecoran.
Efek penambahan ytterbium dianalisis dengan beberapa pengujian diantaranya adalah XRF, XRD, SEM-EDX, Metalografi, Potensiotat dan Uji Efisiensi Anoda dengan standar NVGL�RP-B401. Berdasarkan pengujian yang telah dilakukan diperoleh hasil berupa perubahan butiran pada mikrostruktur menjadi halus dan seragam seiring meningkatnya persentase ytterbium. Fenomena ini disebabkan oleh kemampuan ytterbium sebagai grain refinement.
Selama proses solidifikasi ditemukan bahwa ytterbium memiliki kecenderungan untuk membentuk senyawa YbZn2 pada batas butir. Laju korosi pada sampel penambahan ytterbium
0, 1, 2, dan 3% berturut-turut adalah 0,38348, 0,12049, 0,10367, dan 0,059231 mm/year. Laju korosi yang menurun seiring bertambahnya persentase ytterbium diakibatkan oleh butiran yang seragam memiliki efek pelarutan anoda yang lebih seragam. Setelah melakukan uji efisiensi anoda dengan standar DNVGL-RP-B401, diketahui bahwa efisiensi anoda korban meningkat seiring bertambahnya ytterbium. Dalam lingkungan 3% NaCl, efisiensi anoda untuk sampel
penambahan ytterbium sebesar 0, 1, 2, dan 3% berturut-turut adalah 59,35, 81,46, 89,14, dan 94,74%. Namun pada lingkungan 3,5% NaCl, menunjukkan efisiensi yang lebih rendah yaitu 54,7, 74,8, 85,45, dan 91,44%. Efisiensi yang lebih rendah disebabkan karena ion klorida yang tinggi mampu mempercepat laju pelarutan anoda.
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Chloride ion is classified as a catalytic ion capable of accelerating the rate of corrosion which can result in various kinds of losses on iron and steel surfaces such as reduced service life, mass, thickness and performance of these metals. To protect these metals, cathodic protection is needed which is superior protection in the seawater environment because of its adequate current capacity, practicality and low cost. This study aims to analyze the effect of the addition of 1, 2, and 3% rare earth elements ytterbium and NaCl content on the efficiency of the sacrificial anode in an environment of 3 and 3.5% NaCl. To obtain aluminum and ytterbium alloys, research requires casting processes. The effect of adding ytterbium was analyzed by several tests including XRF, XRD, SEM-EDX, Metallography, Potentiotat and Anode Efficiency Test with the DNVGL-RP-B401 standard. Based on the tests that have been carried out, the results obtained are changes in the grain in the microstructure to become smooth and uniform as the percentage of ytterbium increases. This phenomenon is caused by the ability of ytterbium as a grain refinement. During the solidification process it was found that ytterbium has a tendency to form YbZn2 compounds at grain boundaries. Corrosion rates on samples of 0, 1, 2, and 3% ytterbium addition were 0.38348, 0.12049, 0.10367, and 0.059231 mm/year, respectively. After carrying out an anode efficiency test with the DNVGL-RP-B401 standard, it is known that the efficiency of a sacrificial anode increases with increasing ytterbium. In a 3% NaCl environment, the anode efficiencies for 0, 1, 2, and 3% ytterbium addition samples
were 59.35, 81.46, 89.14, and 94.74%, respectively. However, in a 3.5% NaCl environment, it showed a lower efficiency of 54.7, 74.8, 85.45 and 91.44%. The lower efficiency is due to the high chloride ion which can accelerate the dissolution rate of the anode.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Aluminium, Anoda Korban, Butir, Efisiensi, Ytterbium, Aluminum, Efficiency, Grain, Sacrificial anode, Ytterbium
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
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering
Depositing User:	Banindra Alvin Farial Azra
Date Deposited:	26 Jul 2023 03:39
Last Modified:	26 Jul 2023 03:39
URI:	http://repository.its.ac.id/id/eprint/99296

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