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I Gusti Ayu Arwati
Universitas Mercu Buana
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Use of Hibiscus rosa-sinensis as a Green Corrosion Inhibitor for Valve Materials in RO Water Pudjiwati, Sri; Sanusi, Yasa; Arwati, I Gusti Ayu
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 7, No 2 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v7i2.32806

Abstract

Valves are mechanical devices that regulate the flow of oil and gas fluids and are typically constructed from materials that are heat-resistant, corrosion-resistant, and capable of withstanding high pressure. However, observations from valve manufacturing companies in the Banten area have shown that valve components made from medium carbon steel ASTM A105N are susceptible to corrosion during hydrotesting, particularly when using reverse osmosis (RO) water as the testing medium. This corrosion can degrade product quality before delivery to customers. To address this issue, this study investigates the use of Hibiscus rosa-sinensis as a green corrosion inhibitor. The objective of this research is to evaluate the corrosion rate, inhibitor efficiency, and surface morphology of ASTM A105N valve materials using Hibiscus rosa-sinensis in RO water media, with varying inhibitor concentrations and immersion durations. The electrochemical methods used include Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy (EIS), Chronoamperometry, and Scanning Electron Microscopy (SEM). Results from the corrosion rate tests indicated that the highest inhibitor efficiency—59.04%—was achieved at 24 hours of immersion with a 2 g inhibitor concentration. This condition also yielded the lowest corrosion rate of 1.2231 × 10⁻² mm/year and the lowest corrosion current (Icorr) of 3.2601 × 10⁻⁶ A/cm². Chronoamperometry testing confirmed these findings with the lowest electric charge value of 0.0125 C. SEM analysis further revealed a more uniform and homogeneous protective coating on the metal surface under these conditions. Based on these results, Hibiscus rosa-sinensis demonstrates promising performance as a green corrosion inhibitor and is recommended as an additive in RO water for valve hydrotesting. This study highlights the potential of environmentally friendly and cost-effective inhibitors in reducing corrosion risk in valve materials.
Effect of Intake Manifold Porting and Polishing and Throttle Body Venturi Diameter Modification on Motorcycle Performance Anbia, Gun Gun; Arwati, I Gusti Ayu
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 13, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v13i2.27416

Abstract

This study aims to investigate the effect of intake manifold and throttle body modifications on the performance of a Yamaha Mio M3 125cc motorcycle engine. A two-level factorial experimental design with two factors was employed: intake manifold diameter (27 mm and 30 mm) and throttle body diameter (26 mm and 28 mm). Data were collected using a dyno test and analyzed using statistical methods. The results revealed that intake manifold and throttle body modifications significantly influenced the performance of the Yamaha Mio M3 125cc motorcycle engine. The combination of a 27 mm intake manifold and a 28 mm throttle body produced the highest torque of 23.1 Nm at 2,058 RPM, while the combination of a 27 mm intake manifold and a 26 mm throttle body generated the highest power of 11.2 HP at 7,155 RPM. These modifications resulted in a 10.53% increase in torque and a 16.67% increase in power compared to the standard configuration. Modifying the intake manifold and throttle body can enhance the performance of the Yamaha Mio M3 125cc motorcycle engine. Keywords: Intake manifold modification, Throttle body modification, Engine performance, Yamaha Mio M3 125cc
STRENGTH ANALYSIS OF STEEL ROPE ON FREIGHT ELEVATOR WITH A HOIST LIFTING CAPACITY OF 3 TONS Risdiyan, Asep; Haftirman, Haftirman; Arwati, I Gusti Ayu
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 13, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v13i2.19053

Abstract

Steel rope has advantages over chains, but also has disadvantages. The advantage is that it is resistant to shock loads, if it breaks it shows a brittle sign on one of the wires (Houda Mouradi, 2018). The drawbacks are that they are not resistant to corrosion, are difficult to bend, can stretch or elongate, and tend to rotate (Aginaparru, 2018). In this study the analysis carried out was the process for the Salt Spray test to determine the effect of the corrosion rate on steel rope and the tensile test process aimed at determining the phase transformation, plasticity, creep, fatigue, to the fatigue point, as well as metallographic tests for changes in the properties mechanic. Loss or loss of weight on steel rope type 6 x Fi (29), diameter 13 from the salt spray test process, increased the corrosion rate from 0.21 mpy to 0.23 mpy. The greater the tensile force, the greater the tensile stress that occurs. And the greater the tensile force, the greater the elastic modulus that occurs from the elastic limit to the fatigue limit due to the magnitude of the tensile force that exceeds the limit. In metallographic testing using the ASTM 317 / ASTM E 407 method, it can be concluded that the steel rope has a modulus of elasticity, visible crack lines in the steel rope structure indicating that the steel rope has undergone an elastic process to the fatigue limit or fracture limit. Keywords: Salt Spray, wire, creep, fatigue 
Tinjauan Pengaruh Iklim Pantai Terhadap Laju Korosi Kerangka Kendaraan Dengan Variasi Perlakuan Hendranata, Deni; Arwati, I Gusti Ayu; Darmono, Bambang
RIGGS: Journal of Artificial Intelligence and Digital Business Vol. 4 No. 2 (2025): Mei - Juli
Publisher : Prodi Bisnis Digital Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/riggs.v4i2.1500

Abstract

Iklim tropis di daerah pantai dapat mempengaruhi ketahanan material baja untuk struktur kendaraan sepeda motor, karena iklim daerah pantai dapat mnimbulkan korosi pada material baja yang mana iklim lembab dapat meningkatkan tingkat korosi pada baja. Penelitian ini bertujuan untuk mengetahui laju korosi karena pengaruh iklim di daerah pantai terhadap ketahanan jenis baja yang digunakan pada struktur kerangka sepeda motor dengan perlakuan pemaparan langsung, bending, dan pengelasan. Metode yang digunakan dalam penelitian ini adalah dilakukan pengujian secara eksperimen yaitu metode weight loss and gravimetry. Hasil penelitian ini menunjukkan bahwa penggunaan baja dengan dimensi dan ketebalan tertentu serta pengelasan dengan berbagai proses menunjukkan tingkat korosi yang tinggi. Sedangkan pengujian laju korosi pada baja ASTM A36 setelah proses bending menunjukkan bahwa semakin lama waktu pencelupan, laju korosi semakin kecil. Penelitian ini juga menemukan bahwa laju korosi terbesar terjadi pada menit ke-30 saat menggunakan metode celup diam sebesar 156,46 mmpy dengan sudut bending 1800 . Pengelasan juga memiliki pengaruh terhadap laju korosi yang mana korosi pitting lebih dominan terjadi pada base metal dari pada welded metal. Perlakuan inhibitor dan pelapisan anti korosi diperlukan untuk mencegah korosi pada baja yang terpapar atmosfer iklim tropis di daerah pantai.
Co-Authors Agustin, Andhika Permana Alfattah, Muhammad ANBIA, GUN GUN Darmono, Bambang Edy Herianto Majlan, Edy Herianto Endah Retno Wuryandari, Nur Euis Nina Saparina Haftirman, Haftirman Hari Setiyawati Hendranata, Deni Ibdal Satar Lase, Asaeli Tongoni Lutfiana, Diana Muhamad Fitri Muhammad Edi Laksono Nina Saparina Yuliani, Euis Nur Endah Retno Wuryandari Pudjiwati, Sri Risdiyan, Asep Sagir Alva Sanusi, Yasa Sidik, Yusuf Samil Syamsul, Nurato Titia Izzati, Titia Tyas Wedhasari, Tyas Wahyu Irwansyah Yananto Mihadi Putra