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All Journal Traksi : Majalah Ilmiah Teknik Mesin Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Sains Materi Indonesia SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN Widyariset Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Science and Technology Indonesia Majalah Ilmiah Material, Komponen dan Konstruksi Jurnal AUDI Jurnal Rekayasa Material, Manufaktur & Energi Indonesian Journal of Chemistry NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Majalah Ilmiah Pengkajian Industri Metalurgi Jurnal Metalurgi dan Material Indonesia Journal of Engineering and Scientific Research (JESR) Piston: Journal of Technical Engineering Widyariset Teknomekanik Indonesian Journal of Engineering and Science (IJES) Journal of Materials Exploration and Findings Malcom: Indonesian Journal of Machine Learning and Computer Science Metalurgi Jurnal Sains Materi Indonesia Recent in Engineering Science and Technology
Rini Riastuti, Rini
Departemen Teknik Metalurgi Dan Material, Fakultas Teknik, Universitas Indonesia, Depok
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Transportation

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Journal : Metalurgi

 1 
Pengaruh Anneal Hardening Dan % Reduksi Warm Rolling Terhadap Sifat Mekanik Paduan Cu-Zn 70/30 [Influence of Anneal Hardening And Warm Rolling % Reduction To Mechanical Properties of Cu-Zn 70/30] Eka Febriyanti; Dedi Priadi; Rini Riastuti
Metalurgi Vol 31, No 1 (2016): Metalurgi Vol. 31 No. 1 April 2016
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1577.138 KB) | DOI: 10.14203/metalurgi.v31i1.93

Abstract

Copper alloy has many uses in industry. However, in its application requires high mechanical properties. Therefore, copper alloys has been hardened conventionally by solution and/or precipitation hardening and dispersion hardening then is experienced with anneal hardening mechanism through an annealing process at 150-300 °C. In this research, Cu-Zn 70/30 alloys was subjected to warm rolling with 50% and 60% in reduction percentage followed by annealing. Several examinations was done after warm rolling such as microhardness testing, tensile testing, metallography, and FESEM (field emission scanning electron microscope). The results show that anneal hardening was occured at 300 °C followed by increasing of hardness value, tensile strength, and decreasing of elongation. Anneal hardening mechanism in Cu-Zn 70/30 was obtained by increasing % reduction during warm rolling and anneal process. This is caused by Zn element which is segregated into dislocation and observed with FESEM analysis as deformation band. With increasing of % reduction to Cu-Zn 70/30 alloy will also results denser and thicker deformation bands.AbstrakPaduan tembaga memiliki banyak kegunaan dalam bidang industri. Namun, dalam aplikasinya membutuhkan sifat mekanis yang tinggi. Oleh karena paduan tembaga sulit dilakukan pengerasan secara konvensional seperti alloying, precipitation hardening, dan dispersion hardening maka yang dilakukan adalah dengan mekanisme anneal hardening melalui proses anil pada suhu 150-300 °C. Pada penelitian ini, paduan Cu-Zn 70/30 dilakukan warm rolling pada suhu 300 °C dengan presentase reduksi 50% dan 60%. Karakterisasi yang dilakukan setelah proses di atas adalah uji kekerasan secara mikro, uji tarik, pengamatan metalografi, dan analisa dengan FESEM (field emission scanning electron microscope). Hasil pemeriksaan menunjukkan bahwa efek anneal hardening muncul pada suhu 300 °C yang diikuti dengan peningkatan nilai kekerasan dan kekuatan tarik, namun persen elongasinya menurun. Dengan semakin besarnya % reduksi warm rolling diikuti dengan proses anneal yang dilakukan terhadap paduan Cu-Zn 70/30 mengakibatkan terjadinya anneal hardening. Hal ini disebabkan karena adanya unsur Zn yang tersegregasi dalam dislokasi dan teramati dengan FESEM sebagai pita-pita deformasi (deformation band). Dengan meningkatnya % reduksi yang diberikan pada paduan juga akan menghasilkan pita-pita deformasi yang semakin rapat dan tebal.
Surface Modification of Composite Coating for Marine Application: A Short Review Aulia, Hafiz; Riastuti, Rini; Ramdhani, Rizal Tresna
Metalurgi Vol 39, No 1 (2024): Metalurgi Vol. 39 No. 1 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.746

Abstract

Corrosion is one of the phenomena that affects the deterioration of materials in offshore applications. Marine corrosion is particularly aggressive, due to the high salt content and low electrical resistivity of seawater. Corrosion cannot be stopped completely, but the reaction can be slowed down. Applying coating is an effective and widely used method to protect metal surfaces from corrosion. Coatings act as a barrier between the metal and its environment, preventing or slowing down the corrosive processes. Pursuant to ISO 12944, the most commonly used generics for coating systems in marine service are alkyd, acrylic, ethyl silicate, epoxy, vinyl ester, polyurethane, polyaspartic, and polysiloxane. The latest innovations in marine coatings still use a layer-by-layer coating method (e.g. primer coats, intermediate coats, and top coats) depending on thickness. Marine structures exposed to the atmospheric zones are usually coated with one or two coats of epoxy. A slightly more costly system of one coat of zinc-rich primer, one coat of epoxy, and one coat of aliphatic polyurethane may provide better performance. Coating systems for the atmospheric zones are frequently used in the intertidal and splash zones. Immersion zones of marine structures are commonly coated with one or two coats of 100% solid epoxy or three coats of solvent-borne epoxy. A single polymer as a generic coating have limitations. Adding fillers is a common method to improve the properties of polymers to become a composite. In marine coatings, fillers are still limited to glass flakes and powder. Poor dispersion and agglomeration might reduce the effectiveness of fillers in the matrix, which decreases the adhesion properties. The fillers must be surface modification before the application. This review provides a comprehensive and critical review of the current research status of composite coatings that serve as candidates to be used in marine coating.
Effect of Surface Roughness on Adhesion Strength and Corrosion Resistance of Silica-Epoxy Composite Coated Low Carbon Steel Tresna, Rizal; Amrullah, Keanu Rafi; Rahmatullah, Aqil; Febriana, Eni; Lalasari, Latifa Hanum; Riastuti, Rini
Metalurgi Vol 39, No 3 (2024): Metalurgi Vol. 39 No. 3 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.777

Abstract

Low-carbon steel is widely used in various industries but is susceptible to corrosion in aggressive environments, prompting this study on an epoxy-silica composite coating with variations in silica concentration (0-5 wt.%), sonication dispersion, and surface preparation (abrasive blast cleaning and power tool cleaning); the results showed that abrasive blast cleaning produced a surface roughness of 79 µm and superior adhesion strength (10.48 MPa) compared to power tool cleaning, with a perfect 5A rating in the x-cut tape test for all silica concentrations, while the highest adhesion strength of 14.33 MPa was achieved at 3 wt.% silica, and coating durability tests revealed the best performance exhibiting minimal corrosion propagation of only 0.55 mm after 72 hours at 5 wt.% silica in scratch tests using abrasive blast cleaning, underscoring the significant influence of surface preparation method on coating performance.
Co-Authors Abdullah, Abdul Halim Adam Hidana Yudo Saputro, Adam Hidana Yudo Adi Noer Syahid Adipurnama, Iman Agus Supriyanto Ahmad Fadli Ahmad Fadli Ahmad Maksum Ahmad Zakiyuddin Akhmad Faizal Alfian Alfian Amalia, Dinda Putri Amanda, Putri Amin Suhadi Amin Suhadi Amin Suhadi Amin Suhadi Amin Suhadi Amin Suhadi, Amin Amrullah, Keanu Rafi Andryansah Andryansah Anjar Oktikawati Aqila, Daffa Aulia, Hafiz Ayu Rizeki Ridhowati Ayu Rizeki Ridhowati Azizah Intan Pangesty Badrul Munir, Badrul Bashari R Roszardi Baskoro, Agung budiarto, wahyu Chalid, Muchamad Dedi Priadi Dedi Priadi Dedi Priadi Dedi Supriadi Diana Natalia Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Febi Dwi Antony Febriana, Eni Febriyanti, Eka febriyanti, eka febriyanti, eka Gadang Priyotomo Gadang Priyotomo Hari Eko Irianto Ibrahim, Muhammad Hamka Ifah Munifah Irawan, Januar IRWAN WIJAYA J.W. Soedarsono Jamal Basmal, Jamal Jamhari Jamhari Johny Wahyuadi Soedarsono Kaban, Agus S Kautsar Muwahhid Kautsar Muwahhid Kusumaningrum, Wida Banar Lalasari, Latifa Hanum Manurung, Rizky Rama Putra Marda, Yanuar Mohamad Mega Herawati Arifiana Amanah Notonegoro, Mega Herawati Arifiana Amanah Mhd. Ibkar Yusran Asfar Mochamad Chalid Muhammad Refai Muslih Muhammad Rifai Muhammad Yunus Muhammad Yunus Najmudin, Muhammad Guruh Nikitasari, Arini Nono Darsono Nono Darsono, Nono Nurhayati Nurhayati Nurhayati Paltgor, Rinush Fedrikdo Putri Salsabila, Syanatha Rachmat Hermawan Rahardian, Krisnandha Rahmatullah, Aqil Ramadhani, Rizal T Ramadhani, Rizal Tresna Ramdhani, Rizal Tresna Riady, Rado Ridhowati, Ayu Rizeki Ridhowati, Ayu Rizeki Rinta Kusumawati, Rinta Rinush Fedrikdo Paltgor Rizal Tresna Ramdhani Roszardi, Bashari R Roszardi, Bashari Rohululloh Roziafanto, Ahmad Nandang Santoso, Irwan Wijaya SATRIYAS ILYAS Sunarso Sunarso Syahid, Adi Noer Tiggor, Triadhi Panthun Tresna, Rizal Tri Handayani Tri Hardi Priyanto Wahyu Budiarto Widianto, Shilla Rizqi Winarto Winarto Yuanto, Nursidi