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All Journal Scientific Journal of Mechanical Engineering Kinematika Energy, Materials and Product Design
Syarif Hidayatullah
Universitas Mataram
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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INVESTIGASI EKSTRAK KULIT BATANG KAPUK SEBAGAI INHIBITOR KOROSI PADA BESI ASTM A36 DALAM LARUTAN NaCl 5% Syarif Hidayatullah; Suteja
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.791

Abstract

The growing concern for sustainability and environmental issues in the field of metal corrosion has become increasingly urgent in response to global demands for the adoption of environmentally friendly technologies. One of the widely used approaches to address this challenge is the utilization of plant-based corrosion inhibitors due to their abundant availability and relatively simple extraction process. This study aims to investigate the effect of varying concentrations of kapok bark extract inhibitors specifically at 1000, 2000, and 3000 mg/L on the corrosion rate of ASTM A36 steel in a 5% NaCl solution. The anticorrosion performance and inhibition mechanism were carefully examined through potentiodynamic polarization (PDP) testing and electrochemical impedance spectroscopy (EIS). The results revealed that at a concentration of 3000 mg/L, the kapok bark extract was able to significantly reduce both cathodic and anodic reaction rates. This condition led to a decrease in the corrosion rate from 1.51 to 0.28 mm/year in the NaCl solution. The highest inhibition efficiency, 81.61%, was achieved at an inhibitor concentration of 3000 mg/L. Based on these findings, the kapok bark extract demonstrates significant potential as an environmentally friendly corrosion inhibitor for ASTM A36 steel.
KARAKTERISTIK FISIK, MEKANIK, DAN THERMAL BIOKOMPOSIT PVA DIPERKUAT NANOSELULOSA SERAT WARU - SERBUK CaCO3 Suteja; Syarif Hidayatullah
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.810

Abstract

Polyvinyl alcohol (PVA) biocomposites are a potential material to replace conventional plastics, but mechanical strength and thermal resistance are still low. To overcome these limitations, reinforcement from waru fiber nanocellulose (NCW) and calcium carbonate (CaCO₃) fillers are added to PVA bioplastics. Biocomposites formulator were mixed using a magnetic stirrer until gel formed, then poured onto glass and dried in oven for 12 hours at 60 °C. The density results showed an increase to 2.15 g/cm3 and a thickness of 1.32 mm after adding CaCO3. Meanwhile, PVA-NCW had a density and thickness of 1.27 g/cm3 and 0.26 mm respectively. This indicates as a major factor in increasing the tensile strength of biocomposites. The fillers play a role in increasing the tensile strength of biocomposites through better surface bonding. In addition, the interfacial bonding between PVA and the fillers has been confirmed by FTIR results. SEM observation shows the presence of clumps of NCW and CaCO3. In line with the tensile testing, the highest thermal resistance was also found in the PVA-CaCO3 sample. This is in line with the amount of residue produced by the PVA-CaCO3 sample 6.38%. The developed biocomposite offers great potential as a conventional plastics substitute.
EKSPLORE KARAKTERISTIK TARIK, THERMAL DAN MORPHOLOGY KOMPOSIT EPOXY DIPERKUAT SERAT TIMOHO – MIKRO SERBUK Al2O3 Suteja; Syarif Hidayatullah
Energy, Materials and Product Design Vol. 5 No. 1 (2026): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/empd.v5n1.376-382

Abstract

Epoxy composites reinforced with natural fibers can be added with a second filler in the form of powder to enhance their performance. This method affects the thermal resistance properties of the composites. This study investigates the development of epoxy composites reinforced with timoho fibers to which an aluminum oxide (Al₂O₃) powder filler has been added. The composites were fabricated using the hand lay-up method, and the tensile properties, thermal conductivity, and fracture morphology of the epoxy composites were analyzed to determine the effect of varying the volume fraction of Al₂O₃ filler on epoxy composites containing 20% (wt) timoho fibers. The results of the investigation showed that the highest tensile strength of 70.41 MPa was obtained by the SA composite, then decreased to 51.15 MPa in the SC composite. The highest thermal conductivity and linear thermal expansion coefficient values for the composites were each found in the SA sample, at 1179.13 W/m·K and 1045.25 °C, respectively. SEM morphology revealed that the timoho fibers experienced fiber pull-out and cracks in the epoxy matrix. Overall, the SEM images support the tensile strength values.
Co-Authors Suteja