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All Journal Rekayasa Mesin Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Abdi Insani Jurnal Bakti Nusa Journal of Business, Social and Technology Jurnal Pendidikan dan Pengabdian Masyarakat Jurnal Pengabdian Masyarakat Bangsa Protech Biosystems Journal Jurnal Polimesin
Sinarep Sinarep
Fakultas Teknik Universitas Mataram
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Journal : Protech Biosystems Journal

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Utilization of Pumpkin seed waste extract as an inhibitor in reducing the corrosion rate on metals Hidayatullah, Syarif; Sari, Nasmi Herlina; Huda, Ahmad Akromul; Pradityatama, Maharsa; Sinarep, Sinarep; suteja, suteja
Protech Biosystems Journal Vol 5, No 1 (2025): Protech Biosystem Journal
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/protech.v5i1.32116

Abstract

Our research focuses on enhancing the potential of pumpkin seed waste extract as a sustainable corrosion inhibitor for metal (Fe) in 1 M HCl solution. Phytochemical screening and antioxidant activity were identified. Various investigative methodologies including experimental techniques such as Potentiodynamic Polarization (PDP) were used to evaluate the effectiveness of these pumpkin seed waste extract inhibitors in inhibiting corrosion. Electrochemical results showed that the effectiveness of the inhibitor was concentration dependent here reaching 83.11% at 3000 g/L pumpkin seed waste extract inhibitor. The PDP showed that the mixed inhibition control effectively retarded the corrosion of the metal. Furthermore, the adsorption behavior of the pumpkin seed waste extract inhibitor onto the metal follows the Langmuir isotherm model with physisorption properties. The adsorption mechanism of the inhibitor on the metal surface successfully formed a protective film on the metal surface thereby reducing the corrosion rate.  
Characteristics Of Physical, Mechanical And Chemical Properties Of Cissus Sicyoides And Its Composites Apriandi, M. irawan; Sari, Nasmi Herlina; Sinarep, Sinarep
Protech Biosystems Journal Vol 5, No 1 (2025): Protech Biosystem Journal
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/protech.v5i1.32908

Abstract

This study aims to examine the characteristics of Cissus Sicyoides natural fibers extracted by two different methods, namely mechanical and boiling methods, and their application as reinforcing materials for epoxy resin-based composites. The characteristic of fibers was tested through physical and chemical properties, and fiber morphology, including tensile tests, FTIR, SEM and chemical composition. The results showed that the mechanical method produced fibers with higher tensile strength (431.41 MPa) and rougher surface structures, which support better mechanical bonding in the composite matrix. Meanwhile, the boiling method produced fibers with higher cellulose content (23.05%) and a cleaner and tidier surface. FTIR tests confirmed the presence of hydroxyl and carbonyl groups in both samples, while SEM results showed significant presence in the surface morphology and fiber cross-section. Composites made with fibers from the mechanical method had higher tensile strength (28.97 MPa) compared to composites from the boiling method (9.42 MPa). Overall, Cissus Sicyoides fiber has the potential as a composite reinforcing material with a mechanical extraction method that is superior in producing better mechanical performance. The findings of this study add to the use of local natural fibers as an alternative, ecologically friendly composite reinforcement for lightweight buildings.
Co-Authors Achmad Zainuri Agus Dwi Catur Akbar, Zaenul Ali Imron, Muhamad Alit Triadi, Anak Agung Allo Padang, Yesung Andi Maulana, Andi Apriandi, M. Irawan Arif Mulyanto, Arif Aulia, Yesi Az-Zahro, Kholisatun Nafila Dwi Setyawan Habibi, Angga Wildan Hakiki, Irfan Harsi Harsi, Harsi Haryansyah, Anugrah Huda, Ahmad Akromul I Dewa Ketut Okariawan, I Dewa I Made Mara I Made Nuarsa, I Made I Nyoman Wahyu Satiawan Kamalia, Ima Karunia, Qorina KUSUMA WARDANI M. Mirmanto, M. Made Wirawan, Made Maharsa Pradityatama Maulana, Lalu Muhammad Septian Nanang Prayitno Nasmi Herlina Sari Nazmi Herlina Sari, Nazmi Herlina Nurchayati Nurchayati Pandri Pandiatmi Paryanto Dwi Setyawan Puad, Rae Nanda Azmi Rini Anggraini, Rini Rudy Sutanto Salman Salman Salsananda, Dixie Sari, Yolanda Rizky Permata Sugiman Sugiman Sujita, Sujita Suksmadana, I Made Budi Sultan . Sultan Sultan Suteja Suteja, Suteja Syahrul Syahrul Syahrul, Ahmad Ibrahim Syarif Hidayatullah Ulandari, Adelia Agustina Widiarta, I Made Abdi Yesung Allo Padang, Yesung Allo