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All Journal International Journal of Marine Engineering Innovation and Research
Untung Budiarto
Universitas Diponegoro
Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Analysis of the Effect of Voltage and Zinc Plating Duration on Low Carbon Steel A36 by Electroplating Process on Corrosion Rate Ari Wibawa Budi Santosa; Agil Arianda Alkhudry; Untung Budiarto; Eko Sasmito Hadi; Andi Trimulyono
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 2 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.4974

Abstract

Corrosion is a significant issue in steel constructions, and zinc coating (electroplating) is one of the methods used to protect steel from corrosion. This research aims to analyze the effect of voltage and duration of zinc coating on low carbon steel A36 through the electroplating process on the corrosion rate and coating thickness. An experimental method was employed, varying the voltage (6, 8, and 10 Volts) and coating duration (10, 20, and 30 minutes) during the electroplating process using a ZnO solution. The corrosion rate was tested electrochemically in a 3.5% NaCl solution. The results showed a significant correlation between voltage, coating duration, corrosion rate, and coating thickness. Higher voltages and longer durations produced thicker zinc coatings and reduced the corrosion rate. The optimal conditions were found at 10 Volts for 30 minutes, producing a 160 (Mu)m thick coating and the lowest corrosion rate of 0.00318 mmpy. The minimal coating condition, 6 Volts for 10 minutes, resulted in a 30 (Mu)m thick coating and a corrosion rate of 0.050120 mmpy.
Analysis Of Magnus Effect Toward The Shaft Of Vetical Axis Hydro Turbine H-Darrieus Rizki Aulia Chandra Putera; Muhammad Luqman Hakim; Untung Budiarto; Samuel
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 4 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i4.5092

Abstract

Nowaday, at least 80% of the world's cargo is shipped via marine transportation modes, so with the amount of shipping activity, the shipping industry produces air pollution of at least 3.3% of global carbon dioxide emissions. The problem is trying to be answered by reducing a fuel use, one of which is through drag reduction. It is estimated that at least 80-90% of the drag that occurs on VLCC (Very Large Crude Carrier), comes from frictional drag that occurs on the surface of the hull. One of method to reducing frictional drag is by applying a hydrophobic coating. The hydrophobic coating has molecular physical properties to repel water. Similar as the water on a lotus leaf that can’t wet the leaves even a little, this phenomenon is called the Hydrophobic effect. Applying the hydrophobic coating on the specimen is done by spraying hydrophobic coating paint. As It seen from the contact angle with value above 900 shows the hydrophobic effect on the coated surface. This research aims to prove whether the application of hydrophobic coating on the hull specimen would give a significant effect such as buoyancy increase and drag reduction characteristics. The research method used is the experimental method by pulling the ship model utilizing the free fall of the load mass to provide a pulling force to the ship model and hydrophobic evaluation of the surface. The experiment was carried out in the Diponegoro University’s hydrodynamics lab with the assumption that the increase in acceleration is a drag reduction. From the test results, it was found that the drag reduction value has a percentage above 25% with the use of light mass variations. In the experiment, there is phenomenon of buoyancy increase characteristic appeared after the appliance of hydrophobic coating.
Analysis of FSW and TIG Aluminium 5052 Welded Joint Strength Due to The Effect of Working Temperature Hartono Yudo; Razin Hilmy Baihaqi; Untung Budiarto
International Journal of Marine Engineering Innovation and Research Vol. 7 No. 3 (2022)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v7i3.5607

Abstract

Aluminium 5052 on ships can be used in LNG tanks, heat exchangers, bulkheads, and superstructures. Its characteristics that can be used in various types of construction in ships cause aluminium 5052 to meet various temperature conditions. The purpose of this research is to find out the strength of the FSW and TIG aluminium 5052 welded joints due to the effect of working temperature. The methods used are impact test and bending test of aluminium 5052 specimens immersed in liquid nitrogen at -1600C and heated in oven at 1660C. The average impact value of raw materials, FSW specimens, and TIG specimens immersed in liquid nitrogen at -1600C are 1.22 J/mm2, 0.2195 J/mm2, and 0.0663 J/mm2, respectively. The average impact value of raw materials, FSW specimens, and TIG specimens heated in an oven at 1660C are 1.3403 J/mm2, 0.1395 J/mm2, and 0.0870 J/mm2, respectively. The average bending stress of raw materials, FSW specimens, and TIG specimens immersed in liquid nitrogen at -1600C are 394.70 MPa, 85.82 MPa, and 299.49 MPa, respectively. The average bending stress of raw materials, FSW specimens, and TIG specimens heated in an oven at 1660C are 400.45 MPa, 148.58 MPa, and 318.55 MPa, respectively. Weld discontinuity observations shows that all raw material specimens do not have open discontinuities exceeding 3 mm, all FSW specimens have open discontinuities exceeding 3 mm, and TIG specimens shows varied results. The conclusion of this study shows that aluminium 5052 is a material that is resistant to temperature changes and is able to maintain its strength at various temperature conditions because aluminium is an FCC (Face Centered Cubic) material.
Co-Authors Agil Arianda Alkhudry Andi Trimulyono Ari Wibawa Budi Santosa Eko Sasmito Hadi Hartono Yudo Muhammad Luqman Hakim Razin Hilmy Baihaqi Rizki Aulia Chandra Putera Samuel