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All Journal Rekayasa Mesin Jurnal Kedaymas JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Penamas: Journal of Community Service Journal of Materials Exploration and Findings Tintamas: Jurnal Pengabdian Indonesia Emas
Tubagus Noor Rohmannudin, Tubagus Noor
Jurusan Teknik Material dan Metalurgi, Fakultas Teknologi Industri, Institut Teknologi Sepuluh Nopember (ITS)
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ANALYSIS THE EFFECTS OF YTTERBIUM RARE EARTH ON THE CORROSION RATE OF SACRIFICIAL ANODE ALUMINIUM IN SEAWATER ENVIRONMENT AT ROOM TEMPERATURE Nurdiansyah, Faisal; Pribadi, Bima Tegar; Rohmannudin, Tubagus Noor; Kurniawan, Budi Agung
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1519

Abstract

Corrosion is a degradation process on metal that happen naturally. Corrosion is one of the most common problems in the industry, resulting the corrosion prevention much needed to increase the lifetime of a material. One of the methods of corrosion prevention is cathodic protection using a sacrificial anode. This research was conducted to analyze the effect of ytterbium rare earth to the corrosion rate of sacrificial anode aluminium in seawater environment. In this research, the ytterbium rare earth used using variety of 14%, 21%, and 22%. The alloy was made using a casting process with a mini furnace, and was characterized using XRF, XRD, SEM-EDX, and Metallographic Tests. Then an immersion test was carried out for 10 days and a tafel test using the Corrtest tool and the CS Studio5 application. The electrolyte solution used is 3.5% NaCl and SCE as a reference electrode. The results show that as the element Ytterbium(Yb) increases, the grain size becomes smaller and finer. This is because Ytterbium(Yb) has a role as a grain refiner. Based on the results of the corrosion rate calculation, the lowest corrosion rate value was sample B with a Yb percentage of 21%, which had a corrosion rate value of 0.005 mm/year on the tafel test. Whereas for the 10-day immersion test, the lowest corrosion rate value was also obtained from sample B with a Yb percentage of 21%, namely 1.030 mm/year. The addition of the element Ytterbium(Yb) decreases the potential value of the sacrificial anode in seawater at room temperature with 22% Al-Yb alloy which has a potential value of the criterion of -821mV, so that only 22% Al-Yb alloy can protect the cathode.
PEMETAAN KOROSIFITAS ATMOSFER MENGGUNAKAN LOGAM BAJA KARBON RENDAH DAN KARBON TINGGI PADA WILAYAH KOTA SURABAYA Rohmannudin, Tubagus Noor; Noerochim, Lukman; Sulistijono, Sulistijono; Achly, Fariza Hafizh; Tanjung, Rifqi Aulia
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1653

Abstract

Corrosion of metals is inevitable. One of the factors that affect corrosion is environmental conditions that contain pollutants like SO2, NO2, and Cl- which are found in many industrial and seaside areas. Surabaya is an area that has 2 types of conditions. In addition, Surabaya is the capital of the province where infrastructure development is running rapidly. Thus, this study maps the level of atmospheric corrosion in five areas in Surabaya by collecting corrosion rate data for 4 months with weight loss method using AISI 1020 Steel and SK5 Steel as test metals. XRD and SEM-EDX tests were conducted to compare the corrosion results. The average corrosion rate of low carbon steel was 0,6561 mpy and high carbon steel was 1,2523 mpy. The results concluded that the high level of atmospheric corrosivity of low carbon steel is in Sukomanunggal, Bulak, Rungkut, Pakal, Krembangan, and Bubutan sub-districts. The medium level is in Tegalsari, Gubeng, Tenggilis Mejoyo, Karang Pilang, Jambangan, Sawahan, and Dukuh Pakis sub-districts. The low level is in Lakarsantri, Mulyorejo, Simokerto, Sambikerep, Genteng, and Wonokromo sub-districts. Meanwhile, high atmospheric corrosivity levels for high carbon steel are in Krembangan, Karang Pilang, Bulak, Tenggilis Mejoyo, Pakal, and Jambangan sub-districts. The medium level is in Rungkut, Sawahan, Bubutan, Wonokromo, Tegalsari, Sukomanunggal, and Lakarsantri sub-districts. The level is in Dukuh Pakis, Genteng, Gubeng, Simokerto, Sambikerep, and Mulyorejo sub-districts. This mapping is based on the level of corrosion in each sub-district which is influenced by the presence of industry and its geographical location.
ANALISIS PENGARUH VARIASI HOLDING TIME ANNEALING TERHADAP LAJU KOROSI TITANIUM PADA LARUTAN CAIRAN TUBUH SINTETIS Rohmannudin, Tubagus Noor; Noerochim, Lukman; Sulistijono, Sulistijono; Luthfiansyah, Candra Rizki; Tanjung, Rifqi Aulia
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1654

Abstract

Biomaterials are crucial for bone implants due to their biocompatible and inert nature, ensuring no adverse effects within the human body. Titanium is renowned for its exceptional corrosion resistance. This research aims to analyze the impact of annealing holding time and pH of synthetic body fluid on the hardness and corrosion rate of titanium. The annealing process was performed at 700°C, with holding times of 30, 60, and 90 minutes. As an electrolyte medium, a Hanks' solution with pH variations of 4, 6, and 8 was used and maintained at 37°C. Potentiodynamic corrosion testing demonstrated the lowest corrosion rate in specimens treated with 30 minutes of annealing at pH 8, measuring 0.32 x 10-2 mmpy. The 30-minute annealing exhibited the lowest corrosion rate, which was confirmed by Electrochemical Impedance Spectroscopy (EIS) results showing a higher Rp value, indicating a lower corrosion rate. This is attributed to the presence of a passive Rutile TiO2 layer formed during the annealing process, as confirmed by X-ray Diffraction (XRD) analysis. Metallography observations indicated that the microstructure of untreated specimens consisted of α and β phases. Scanning Electron Microscopy (SEM) analysis of specimens annealed for 30 minutes revealed an oxide layer on the surface without any visible pores. However, an increase in annealing holding time led to the formation of pores, particularly noticeable after 90 minutes of annealing. The presence of pores in the oxide layer resulted in an increased corrosion rate with longer annealing holding times. Conversely, hardness testing demonstrated that longer annealing holding times resulted in higher hardness values.
Pelayanan Pengujian Polyurethane Di Laboratorium Korosi dan Baterai Material Departemen Teknik Material dan Metalurgi FTIRS-ITS Rohmannudin, Tubagus Noor; Sulistijono, Sulistijono; Amrulloh, M. Farian; Fachri, Muhammad
Jurnal KeDayMas: Kemitraan dan Pemberdayaan Masyarakat Vol. 4 No. 2 (2024): Juli 2024
Publisher : Research Center and Community Services (PPPM) Universitas Hayam Wuruk "Perbanas" Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14414/kedaymas.v7i1.4628

Abstract

Polyurethane is a versatile polymeric material widely used as a substitute for rubber, metal, wood, and plastic due to its flexibility and multifunctional properties. To ensure the quality and reliability of polyurethane produced by the industry, the Corrosion and Battery Laboratory of the Department of Materials and Metallurgical Engineering at FTIRS-ITS conducted comprehensive testing. The tests included compression, shear, density, closed cell content (porosity), and thermal conductivity evaluations. The results showed that the polyurethane tested performed satisfactorily, exceeding the standard in several parameters. Compression testing yielded 2.46 kg/cm² compared to the standard of 2 kg/cm². Shear testing showed 6.63 kg/cm² against the standard of 4 kg/cm². Density testing recorded 49 kg/m³ with a standard of 45 kg/m³. The closed cell content test indicated 91.01% versus the standard of 90%. However, thermal conductivity testing showed 0.2 W/mK at 25°C, differing from the standard of 0.02 W/mK at 20°C. Overall, these results suggest that the tested polyurethane meets and exceeds most quality standards, demonstrating its reliability for various industrial applications. Through these tests, the Materials Chemistry Laboratory contributes to ensuring locally produced industrial products are competitive and reliable, as part of its community service efforts.
Pelatihan Sistem Proteksi Katodik Metode SACP Dan ICCP Pada Baja Kapal Laut Sebagai Peningkatan Kompetensi Sekolah Menengah Tingkat Atas Negeri 9 Surabaya Rohmannudin, Tubagus Noor; Sulistijono; Noerochiem, Lukman; Agung Kurniawan, Budi; Kevin P, Respati
Jurnal KeDayMas: Kemitraan dan Pemberdayaan Masyarakat Vol. 7 No. 01 (2026): Januari Volume 7 No.1
Publisher : Research Center and Community Services (PPPM) Universitas Hayam Wuruk "Perbanas" Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14414/kedaymas.v7i1.5522

Abstract

Proteksi katodik adalah salah satu teknik untuk mengurangi laju korosi pada suatu struktur logam dengan menjadikan logam lain sebagai tumbal atau korban. Salah satu struktur logam adalah kapal laut. Pada sistem ini logam kapal laut berperan sebagai katoda sedangkan logam lain yaitu aluminium atau seng yang ditumbalkan atau dikorbankan berperan sebagai anoda. Katoda memiliki nilai potensial lebih tinggi daripada anoda. Perbedaan nilai potensial ini menyebabkan arus akan mengalir dari katoda ke anoda sedangkan elektron akan mengalir sebaliknya. Katoda akan dipenuhi oleh elektron dan berikatan dengan ion positif yang ada di lingkungan. Hal ini membuat proton yang ada di katoda tidak berpindah tempat sehingga massa katoda menjadi tetap atau tidak terkorosi. Namun, dalam beberapa kasus, anoda korban pada kapal laut tidak berfungsi dengan baik karena beberapa faktor seperti kurang tepatnya pemasangan dan perhitungan anoda korban di kapal laut. Oleh sebab itu perlu dilaksanakan pelatihan pemasangan dan perhitungan anoda korban pada kapal laut. Pelatihan sistem proteksi katodik ini perlu dilakukan di kalangan Sekolah Menengah Atas/ Sederajat di Surabaya sebagai peningkatan kompetensi untuk pembekalan di dunia kerja setelah menyelesaikan masa studi. SMAN 9 Surabaya merupakan salah satu SMAN di Surabaya yang membutuhkan pelatihan tersebut. Hal ini ditunjukkan dengan antusiasnya para guru dan siswa SMAN 9 Surabaya ketika tim pengabdian masyarakat menawarkan program pelatihan ini. Pelatihan ini telah dilaksanakan selama dua hari di Departemen Teknik Material dan Metalurgi FTIRS-ITS. Pelatihan ini memberikan dampak yang sangat signifikan dalam transfer wawasan, ilmu dan teknologi proteksi katodik kepada guru dan siswa SMAN 9 Surabaya. Hal ini ditandai dengan meningkatnya nilai post test dibandingkan dengan pre test. Selain itu, juga ditandai dengan semangat peserta dalam berdiskusi dan mengerjakan tugas-tugas pelatihan dari awal sampai selesai. Pelatihan ini juga memberikan fasilitas kepada peserta untuk konsultasi diskusi ilmiah dan penggunaan fasilitas laboratorium di Departemen Teknik Material dan Metalurgi FTIRS-ITS.
Co-Authors Achly, Fariza Hafizh Adrinanda, Noval Agung Kurniawan, Budi Amrulloh, M. Farian Areliano, Samuel Dharma, Faridz Wira Kevin P, Respati Kusuma, Willy Deviet Lukman Noerochim Luthfiansyah, Candra Rizki Muhammad Fachri Nafi’, Dian Noerochiem, Lukman Nurdiansyah, Faisal Pribadi, Bima Tegar Ragha Radithya Noer Putra Satrianugraha, Rifqi Fernady Sitorus , Grace Aghata Sulistijono Sulistijono , Sulistijono Sulistijono Sulistijono Tanjung, Rifqi Aulia