Analisa Pengaruh pH Dan Temperatur Lingkungan Terhadap Laju Korosi Pada Komponen Penggerak Wesel Bagian Lock Box Dalam Infrastruktur Railway

Syahputra, Wishnu Ahmad Syahputra (2025) Analisa Pengaruh pH Dan Temperatur Lingkungan Terhadap Laju Korosi Pada Komponen Penggerak Wesel Bagian Lock Box Dalam Infrastruktur Railway. Diploma thesis, Institut Teknologi Sepulu Nopember.

Text 2038211005-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (2MB) | Request a copy

Abstract

Wesel merupakan komponen rel kereta api yang berfungsi untuk mengubah arah lintasan kereta. Dikarenakan letak wesel berada pada lingkungan terbuka, maka wesel sangat rentan terhadap pengaruh lingkungan yang menyebabkan korosi. Korosi yang diakibatkan oleh reaksi elektrokimia antara logam dan lingkungan asam, terutama dari hujan asam dapat mempercepat degradasi material sehingga memicu kerusakan struktural pada wesel. Penelitian ini bertujuan untuk mengetahui laju korosi pada wesel lock box dalam kondisi pH yang bervariasi (5; 5,5; dan 6) dan temperatur 20°C, 25°C, 30°C, 35°C, 40°C. Metode yang digunakan untuk uji laju korosi meliputi Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy (EIS), dan Weight Loss, serta pengujian Metalografi untuk mengetahui kondisi pada surface material stang kopel. Pengujian X-Ray Fluorescence (XRF) dan X-Ray Diffraction (XRD) untuk mengetahui produk korosi. Hasil uji Potentiodynamic Polarization menunjukkan laju korosi tertinggi pada pH 5 dan temperatur 40°C, yaitu 0,75622 mm/tahun. Hasil EIS menunjukkan nilai tahanan polarisasi (Rp) terendah pada kondisi pH 5 dan temperatur 40°C, yaitu 895,55 Ω, yang menandakan lapisan pasif lebih rapuh dan mempercepat korosi. Sebaliknya, laju korosi terendah tercatat pada pH 6 dan temperatur 30°C dengan nilai 0,1865 mm/tahun, menunjukkan bahwa lapisan pasif lebih stabil dan perlindungan terhadap korosi lebih efektif, dengan Rp sebesar 3553,6 Ω. Produk korosi yang terbentuk adalah Fe₂O₃ (Hematit) 95,45%, yang dikonfirmasi dengan pengujian XRF, dan Fe₃O₄ (Magnetit) 61,5% serta FeO (Wustite) 36,5%, yang dikonfirmasi dengan hasil uji XRD. Hasil pengujian metalografi menunjukkan permukaan spesimen pada laju korosi tertinggi menunjukkan korosi seragam dengan bintik-bintik gelap. Pada perbesaran lebih tinggi, muncul indikasi awal dari korosi sumuran. Pada laju korosi terendah, ada endapan tidak merata dengan beberapa area utuh. ==========================================================================================================================================
Switch is a component of a railway track that functions to change the direction of the train track. Because the switch is located in an open environment, the switch is very susceptible to environmental influences that cause corrosion. Corrosion caused by electrochemical reactions between metals and acidic environments, especially from acid rain can accelerate material degradation, thus triggering structural damage to the switch. This study aims to determine the corrosion rate of the switch lock box under varying pH conditions (5; 5.5; and 6) and temperatures of 20°C, 25°C, 30°C, 35°C, 40°C. The methods used for the corrosion rate test include Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy (EIS), and Weight Loss, as well as Metallographic testing to determine the condition of the surface of the coupling rod material. X-Ray Fluorescence (XRF) and X-Ray Diffraction (XRD) testing to determine corrosion products. The results of the Potentiodynamic Polarization test showed the highest corrosion rate at pH 5 and a temperature of 40°C, which was 0.75622 mm/year. The EIS results showed the lowest polarization resistance (Rp) value at pH 5 and a temperature of 40°C, which was 895.55 Ω, which indicated that the passive layer was more fragile and accelerated corrosion. Conversely, the lowest corrosion rate was recorded at pH 6 and a temperature of 30°C with a value of 0.1865 mm/year, indicating that the passive layer was more stable and protection against corrosion was more effective, with Rp of 3553.6 Ω. The corrosion products formed were Fe₂O₃ (Hematite) 95.45%, which was confirmed by XRF testing, and Fe₃O₄ (Magnetite) 61.5% and FeO (Wustite) 36.5%, which was confirmed by XRD test results. The results of metallographic testing showed that the surface of the specimen at the highest corrosion rate showed uniform corrosion with dark spots. At higher magnification, early indications of pitting corrosion appear. At the lowest corrosion rates, there are patchy deposits with some intact areas.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Hujan asam, Acid Rain, Laju korosi, Corrosion Rate, Produk Korosi, Corrosion Product, pH, pH, Wesel rel, wesel railway
Subjects:	Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD96F56 Fluorescence spectroscopy 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 Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Wishnu Ahmad Syahputra
Date Deposited:	29 Jul 2025 08:01
Last Modified:	29 Jul 2025 08:01
URI:	http://repository.its.ac.id/id/eprint/122677

Actions (login required)

View Item