Analisis Pengaruh Penambahan Komposisi Ytterbium Pada Aluminium Murni dan pH Larutan Elektrolit 3,3% NaCl Terhadap Efisiensi Anoda Korban Aluminium dengan Metode DNV RP B401

Andhita, Gandhang Kidung Anung (2025) Analisis Pengaruh Penambahan Komposisi Ytterbium Pada Aluminium Murni dan pH Larutan Elektrolit 3,3% NaCl Terhadap Efisiensi Anoda Korban Aluminium dengan Metode DNV RP B401. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi merupakan suatu perilaku penurunan kualitas logam yang terjadi secara alami dan pasti terjadi. Korosi termasuk salah satu masalah yang ditemui pada industri, sehingga pengendalian terkait korosi perlu dilakukan untuk menambah umur pakai pada suatu material.Untuk melindungi suatu logam, dibutuhkan metode untuk pengendalian korosi salah satunya proteksi katodik. metode proteksi katodik merupakan proteksi yang disarankan pada lingkungan yang terendam air laut karena kapasitas arusnya yang memadai, kepraktisan dan biayanya yang murah. Penelitian ini bertujuan menganalisis pengaruh penambahan unsur tanah jarang ytterbium sejumlah 1,6%, 1,76%, dan 1,95% engan media elektrolit pada kondisi asam dan basa serta dalam kadar NaCl terhadap efisiensi anoda korban di lingkungan 3,3% NaCl. Penelitian ini melibatkan serangkaian pengujian meliputi analisis komposisi menggunakanOptical Emission Spectroscopy (OES) dan X-Ray Fluorescence (XRF), karakterisasi struktur kristal melalui X-Ray Diffraction (XRD), serta analisis morfologi dan distribusi unsur dengan Scanning Electron Microscope–Energy Dispersive X-Ray (SEM-EDX). Selain itu, dilakukan juga pengamatan metalografi, pengujian elektrokimia secara potensiodinamik, Electrochemical Impedance Spectroscopy (EIS), serta evaluasi efisiensi anoda korban mengacu pada standar DnVGL-RP-B401. Penambahan unsur tanah jarang ytterbium ke dalam aluminium murni menghasilkan pembentukan fasa eutektik Al + Al₃Yb yang terdistribusi pada batas butir matriks α-Al, yang berkontribusi terhadap penyempurnaan morfologi mikrostruktur berupa penyusutan ukuran butir dan peningkatan keseragaman. Variasi penambahan ytterbium sebesar 1,6%, 1,76%, dan 1,95% menunjukkan efek positif terhadap peningkatan laju korosi aluminium murni,yang pada gilirannya berdampak pada peningkatan efisiensi anoda korban. Berdasarkan hasil pengujian efisiensi anoda dalam komposisi Al-0%Yb; Al-1,6%Yb; Al-1,76%Yb; dan Al- 1,95%Yblarutan NaCl 3,3% pada pH 6 dan 8, diperoleh nilai efisiensi berturut-turut sebesar (73,46; 88,81; 90,54; 94,33) dan (78,39; 88,50; 91,23; 93,38)
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Corrosion is a natural process that leads to the degradation of metal quality and is inevitable. It is a common issue in industrial environments; therefore, corrosion control is essential to extend the service life of materials. One of the effective methods to protect metals is cathodic protection, which is particularly recommended in seawater-immersed environments due to its adequate current capacity, practicality, and low cost. This study aims to analyze the effect of adding the rare earth element ytterbium in concentrations of 1,6%, 1,76%, and 1,95% under acidic and alkaline conditions, as well as varying NaCl concentrations, on the sacrificial anodeefficiency in a 3.3% NaCl environment. The research involves a series of tests, including composition analysis using Optical Emission Spectroscopy (OES) and X-Ray Fluorescence (XRF), crystal structure characterization through X-Ray Diffraction (XRD), and morphological and elemental distribution analysis using Scanning Electron Microscope–Energy Dispersive XRay (SEM-EDX). Additionally, metallographic observations, potentiodynamic polarization tests, Electrochemical Impedance Spectroscopy (EIS), and sacrificial anode efficiency evaluation based on the DnVGL-RP-B401 standard were conducted. The addition of ytterbium to pure aluminum leads to the formation of a eutectic phase of Al + Al₃Yb, distributed along the grain boundaries of the α-Al matrix, which contributes to microstructural refinement byreducing grain size and enhancing uniformity. The ytterbium additions of 1.6%, 1.76%, and 1.95% positively influenced the corrosion rate of pure aluminum, which in turn improved the efficiency of the sacrificial anode. Based on the sacrificial anode efficiency tests in Al-0%Yb; Al-1.6%Yb; Al-1.76%Yb; and Al-1.95%Yb samples immersed in 3.3% NaCl solution at pH 6 and pH 8, the efficiency values obtained were respectively (73.46; 88.81; 90.54; 94.33) and (78.39; 88.50; 91.23; 93.38).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Aluminium, Anoda, Efisiensi, Katoda, Ytterbium, Aluminum, Anode, Efficiency, Ytterbium , Katode
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA462 Metal Corrosion and protection against corrosion
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Gandhang Kidung Anung Andhita
Date Deposited:	31 Jul 2025 05:57
Last Modified:	31 Jul 2025 05:57
URI:	http://repository.its.ac.id/id/eprint/124742

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