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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

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

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.

Pelayanan pengujian kekuatan pipa HDPE di Laboratorium Kimia Material Departemen Teknik Material dan Metalurgi FTIRS-ITS Rohmannudin, Tubagus Noor; Sulistijono, Sulistijono; Amrulloh, M. Farian; Nafi’, Dian; Fachri, Muhammad
Penamas: Journal of Community Service Vol. 4 No. 1 (2024): Penamas: Journal of Community Service
Publisher : Nur Science Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53088/penamas.v4i1.869

HDPE pipes are widely used in various industries, such as drinking water and sewage infrastructure, petroleum, agriculture, and construction. The advantages of HDPE pipes include corrosion resistance, light weight, easy installation, and low maintenance costs. Checking the quality of HDPE pipes, spesifically from industry that we tested, is important to ensure infrastructure safety, prevent system failure, improve operational efficiency, obtain user satisfaction, and conserve resources. We evaluated HDPE pipes with type PN 12.5 SDR 13.6 from industry in terms of resistance to hydrostatic pressure, tensile strength, and expansion capability. The evaluation was carried out at the Material Chemistry Laboratory of the Department of Material Engineering and Metallurgy FTIRS-ITS ITS in accordance with the standards of SNI 4829.2: 2015, ASTM D 638 M, and SNI 2553: 1999. The results show that HDPE pipes can withstand hydrostatic pressure up to 12 bar without leakage. The average tensile strength is 43.34 MPa with an average elongation of 354%, indicating ductile pipe properties with necking. Pipe expansion was observed to be 0.195%, indicating a good ability of the pipe to undergo expansion.

Pendampingan pembuatan alat pengering ikan untuk nelayan di Kawasan Pantai Gresik Rohmannudin, Tubagus Noor; Sulistijono, Sulistijono; Satrianugraha, Rifqi Fernady
Tintamas: Jurnal Pengabdian Indonesia Emas Vol. 2 No. 2 (2025): Tintamas: Jurnal Pengabdian Indonesia Emas
Publisher : Nur Science Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53088/tintamas.v2i2.2167

The objective of this community engagement activity is to support the improvement of the economic well-being of coastal fishermen in the Gresik area. This initiative is based on the need to preserve fish by reducing its moisture content, thereby inhibiting the growth and proliferation of bacteria (microorganisms) and extending the shelf life of the fish. One of the most common preservation methods is drying. Traditionally, fish drying is conducted using direct solar exposure. However, this method is unhygienic, as the fish is exposed to contamination from insects, birds, and other animals. Additionally, it is prone to dust and cannot be carried out during rainy conditions, which delays the drying process and affects productivity. These challenges have led to the idea of designing and developing a fish drying device using an indirect active solar drying method. Therefore, the Corrosion and Battery Laboratory of the Department of Materials and Metallurgical Engineering, Faculty of Industrial Technology and Systems Engineering (DTMM FTIRS – ITS), took the initiative to carry out a community service program focused on the development of a fish drying device through a participatory-collaborative mentoring approach with fishermen in the coastal area of Gresik. As a result of this program, a functional fish drying device was produced, and the local fishermen are now able to utilize it effectively.

PERANCANGAN RE-BRANDING TRI TANGTU KOPI ROASTERS BANDUNG Hakim, Abdurrahman; Sulistijono, Sulistijono; Hidayat, Syarip
eProceedings of Art & Design Vol. 10 No. 5 (2023): Oktober 2023
Publisher : Telkom University

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Abstrak: Kopi merupakan salah satu komoditas terpenting dalam industri perkebunan Indonesia dan mulai banyaknya para penikmat kopi yang menjadikannya sebagai gaya hidup mereka. Dengan fenomena ini, muncul peluang untuk membuka coffee shop Indonesia khususnya di Kota Bandung. Bisnis coffee shop memang sangat menjanjikan sehingga tidak heran jika berbagai merek dan bisnis coffee shop mulai banyak bermunculan di Bandung maka persaingan antar brand pun semakin kuat. Salah satu dari coffee shop pada Kota bandung adalah Tri Tangtu Kopi Roasters. Coffee shop ini beroperasi sejak tahun 2016, Tri Tangtu Kopi Roasters masih lemah dalam identitas visual serta implementasinya pada media promosi. Penelitian ini bertujuan untuk merancang visual identitas dan media promosi yang tepat untuk Tri Tangtu Kopi Roasters. Selain itu, metode penelitian ini menggunakan metode kualitatif dengan akumulasi data melalui observasi, studi pustaka dan wawancara. Data yang telah dikumpul lalu diolah dan dianalisis menggunakan metode SWOT dan metode AISAS. Berdasarkan hasil penelitian dapat di implementasikan pada sebuah perancangan ulang identitas visual dan media promosi yang cocok untuk Tri Tangtu Kopi Roasters menciptakan brand identitas yang kuat, sehingga mampu memikat konsumen.Kata Kunci: Branding, Identitas Visual, Media Promosi, Kopi, Kedai Kopi

DESAIN VISUAL BRANDING 8BUILDING CREATIVITY9 DI TOKO RETAIL MAINAN ANAK Salsabila, Farah; Hidayat, Syarip; Sulistijono, Sulistijono
eProceedings of Art & Design Vol. 10 No. 5 (2023): Oktober 2023
Publisher : Telkom University

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Plastisin adalah mainan tanah liat sintetis yang tidak mengering sehingga dapat digunakan berkali kali. Permainan plastisin ditujukan kepada anak-anak dengan rentang uas 2 - 6 tahun karena pada masa usia tersebut, anak-anak akan melewati masa perkembangan awal, seperti melatih kreativitas, eksplorasi, dan motorik halus. Bermain dengan plastisin dapat membantu anak-anak meningkatkan kreativitas dan kemampuan motorik halus mereka, yang dapat membantu memaksimalkan tahap awal perkembangan mereka. Tidak sedikit orang tua yang minim pengetahuan tentang manfaat dan tujuan bermain plastisin untuk anak. Perancangan visual branding untuk kegiatan BUILDING CREATIVITY merupakan kesempatan penulis untuk memperkenalkan manfaat dan keseruan bermain plastisin untuk orang tua dan anak-anak. Metode pengumpulan data untuk perancangan dan penelitian adalah metode observasi pada toko mainan KIDZ STATION, wawancara, dan studi pustaka dengan mempelajari teori pemasaran, teori desain komunikasi visual, dan teori perusahaan retail. Hasil dari perancangan merupakan pengembangan gagasan media visual branding untuk toko retail mainan anak sebagai island display dan media promosi online di media sosial. Manfaat dari perancangan dan penelitian adalah untuk memberikan informasi dan meningkatkan kesadaran kepada para orang tua dengan anak berumur 2 - 6 tahun tentang pentingnya perkembangan anak dan salah satu pendukung perkembangan imajinasi dan saraf motorik anak yaitu melalui metode bermain plastisin.Kata kunci: Anak-Anak, Kreativitas, Motorik Halus, Plastisin, Visual Branding

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

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

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

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.

PENDAMPINGAN SERTIFIKASI HALAL PRODUK MAKANAN PADA UMKM DEMI MENDUKUNG PERKEMBANGAN USAHA MANDIRI Noor Rohmannudin, Tubagus; Sulistijono, Sulistijono; Susanti, Diah; Abdul, Fakhreza; Nurdiansyah, Haniffudin; Ramadhani, Mavindra
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 6, No 2 (2023): martabe : jurnal pengabdian kepada masyarakat
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v6i2.442-448

Adanya kegiatan ini diharapkan mampu mendorong perkembangan dan pertumbuhan ekonomi Indonesia, khususnya pengembangan ekonomi syariah di tingkat nasional, membantu wirausaha mandiri atau UMKM untuk menjual produk, dan untuk meningkatkan perekonomian. Kegiatan ini diawali dengan mengikuti pelatihan sertifikasi halal yang dilakukan oleh ITS Tekno Sains. Total UMKM yang dibantu dalam sertifikasi halal ini adalah 9 UMKM dengan rincian: Pawon Jeng Ninik, Toko Putri Kue, Sofi Pastry, Telur Asin Azza, Rizky Cookies, Snack Hidayah, Mandiri Ladrang, Klemben Jadoel, Sambal Pecel Pawone Murah. Proses pendampingan dimulai dari pembuatan NPWP, NIB, pengajuan surat izin edar BPOM, hingga pengajuan sertifikasi halal.

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