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I Gusti Ayu Arwati
Mechanical Engineering Program, Engineering Faculty, Mercubuana University
Chemical Engineering, Chemistry & Bioengineering

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Analysis of Characteristics of S45C Steel Changes due to the Quenching and Tempering Process Gian Villany Golwa; Dedik Romahadi; I Gusti Ayu Arwati
World Chemical Engineering Journal VOLUME 6 NO. 2 DECEMBER 2022
Publisher : Chemical Engineering Department, University of Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48181/wcej.v6i2.17611

Abstract

S45C steel has a carbon content of 0.50% and its classified as medium carbon steel. The main element content of S45C is carbon (C) is 0.50%, sulphur (S) is 0.035%, and manganese (Mn) is 0.80%. Tempering is a heat treatment process in which the hardening or normalizing process was previously carried out on steel. The research method was carried out where the steel was heated below the critical temperature and cooled. Quenching is a process of rapidly cooling the material from austenitizing from a temperature range of 815 °C to 870 °C for steel. S45C steel was quenched at 950 °C for 120 minutes, then tempered at 700 °C, and 500 °C for 120 minutes. The raw material sample (without heat treatment) is the initial reference standard among the samples undergoing the heat treatment process. They are then analyzed, and the influence and changes in the characteristics after that. In addition, changes in mechanical properties due to the heat treatment process experienced by S45C steel use tensile tests, Charpy impact tests, hardness tests and microstructures. The research results on the quenching process sample were tempered at a temperature of 500 °C and held for 120 minutes, increasing tensile strength by 17.1% and yield strength of 56.82%.
CATHODIC PROTECTION IN ONSHORE PIPE NETWORKS GAS PAGARDEWA RECEIVING STATION I Gusti Ayu Arwati; Euis N; Dedi Sirait
World Chemical Engineering Journal VOLUME 3 NO. 1 JUNE 2019
Publisher : Chemical Engineering Department, University of Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v3i1.5613

Abstract

The use of pipelines is one element that plays an important role as a production chain The pipeline network is used as the main component to distribute gas from the producer to the shipper and then distributed to industrial and household customers. In accordance with the regulations of the Ministry of Mines and Energy No. 300. K / 38 / M.PE / 1997 concerning the Occupational Safety of Petroleum and Gas Pipeline Pipes that the gas and main pipe transmission pipes held on land must be planted with a depth of at least 1 (one) meter above ground level.  However, the placement of steel pipes in the ground can cause pipe material to be threatened by corrosion due to interaction with the environment. This happens in the Pipeline Line of the Gas Pagardewa receiving station. To prevent corrosion from continuing on the pipeline, a precautionary step is needed where one of them is by applying the cathodic protection method. At Pagardewa Gas Receiver Station, which has the role of distributing gas to PLN's power plan in South Sumatra by using a 4875 m pipeline that is embedded in the ground so it needs to be designed for a cathodic protection system to be corrosion resistant. The purpose of this study is to design a cathodic protection system that uses sacrificial anodes so that the analysis can be obtained to be applied in the field.
Effect of Chitosan on the Corrosion Protection of Aluminum in H2SO4 medium I Gusti Ayu Arwati
World Chemical Engineering Journal VOLUME 2 NO. 1 JUNE 2018
Publisher : Chemical Engineering Department, University of Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v2i1.3386

Abstract

Metal aluminium alloy 5052 is a metal that has a lightweight nature of its utilization is very wide. In addition to light also has other advantages such as a good introduction to heat. But the weakness of this material is easily corrosive in the acid environment. To reduce corrosion rate is generally used inorganic inhibitors such as cremate, but these inhibitors are toxic and can contaminate the environment. This study aims to reduce the corrosion rate of aluminium alloys by using non-toxic and environmentally friendly green chitosan inhibitors. The method used for coating on aluminium alloys by coating the metal by electrophoresis deposition (EPD).  For corrosion rate testing using weight loss method in 0.5M H2SO4 environment and surface analysis using scanning electron microscope (SEM). The results showed that for 7 days the immersion of Al5052 alloyed uncoated a corrosion rate of 3.571 x 10 -5g / Cm2 days but, after coated with chitosan inhibitor the corrosion rate decreased by 1.73 10 -5 g / Cm 2 days.
Aluminum Corrosion Analysis for Environmental Acid Chloride Solution I Gusti Ayu Arwati; Fina Fina
World Chemical Engineering Journal VOLUME 1 NO. 5 DECEMBER 2017
Publisher : Chemical Engineering Department, University of Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v1i5.2547

Abstract

Aluminum is the most commonly used metal. Aluminum is present on the bipolar plate which is a key part in PEMFC (Proton Exchange Membrane Fuel Cell). In the air, aluminum is easily oxidized, forming a thin layer (Al2O3). Therefore it's necessary to do an experiment to find out the extent of corrosion on aluminum. In this experiment, corrosion rate analysis on aluminum is arrived at by using hydrochloric acid (HCl) using weight loss and electrochemical methods. And corrosion rate results of aluminum metal with a concentration of 0.1M ; 0.2M; 0.3M; 0.4M and 0.5M with a concentration of 0.5M with a value 0.04250 grams and the smallest corrosion rate of 0.00030 gram with concentration of 0,1M. The largest value of corrosion rate at 0.58610 (mpy) and 0.91589 Ampere using electrochemical method. Morphology on aluminum is seen using SEM (Scanning Electron Microscope is pitting corrosion).
Corrosion Rate Analysis of JIS G-3141 Steel for Automotive Inner Wheel House Production with Weight Loss Method I Gusti Ayu Arwati; Febrina Ifani
World Chemical Engineering Journal VOLUME 6 NO. 1 JUNE 2022
Publisher : Chemical Engineering Department, University of Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48181/wcej.v6i1.14377

Abstract

The growth of car sales and production has decreased since 2020, this is due to corrosion of automotive steel plates in the form of low carbon steel stored in warehouses. The purpose of this study was to obtain the value of the corrosion rate and its effect on mechanical properties and changes in the composition of carbon values. Low carbon steel plates commonly used by automotives where the material is low carbon steel JIS G-3141, with its elemental content of C 0.12%, Mn 0.5%, P 0.04% and S 0.045% with tensile mechanical properties. strength 270 N/mm2, elongation 37%. The purpose of this study was to obtain the value of the corrosion rate and its effect on mechanical properties and changes in the composition of carbon values. Low carbon steel plates commonly used by automotives where the material is low carbon steel JIS G-3141, with its elemental content of C 0.12%, Mn 0.5%, P 0.04% and S 0.045% with tensile mechanical properties. strength 270 N/mm2, elongation 37%.
Temperature Effect on Corrosion Rate of Metal AA 5052 Using D-Galactose Inhibitors In Sulfuric Acid Media With Electrochemical Method I Gusti Ayu Arwati; Fikri Syahbana; Wiwit S.; Yeyen Maryani
World Chemical Engineering Journal VOLUME 6 NO. 2 DECEMBER 2022
Publisher : Chemical Engineering Department, University of Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48181/wcej.v6i2.17079

Abstract

Aluminum Alloy 5052 (AA 5052) is a metal that can be used as a biopolar plate in proton exchange membrane fuel cell (PEMFC), because it has the advantages of being resistant to corrosion, high conductivity, easy shape and light weight. PEMFC produces electrical energy and the rest of the process in the form of hot water and steam. In a bipolar plate PEMFC environment corrosion can easily occur due to an acidic environment and high operating temperature around 40°C-80°C. For this reason, a treatment is needed to strengthen the corrosion-resistant properties of AA 5052. The coating of the material can be done using the technique of electrophoretic deposition (EPD) using green inhibitor to reduce the corrosion rate. The electrochemical method was carried out to see how much influence temperature had on the corrosion rate of AA 5052. In this study, d-galactose green inhibitor with a concentration of 0.5 g, EPD time of 20 minutes was used, in a PEMFC environmental simulation in 0.5 M H2SO4 sulfuric acid medium, with test temperatures of 25°C (room temperature), 40°C, 60°C, and 80°C. From the results of the analysis using the electrochemical method, there was an effect of temperature on the corrosion rate of AA 5052 without an inhibitor layer of 0.3610 mmpy at room temperature and increased at 80°C 3.9527 mmpy. While AA 5052 which was coated with a d-galactose inhibitor, had a corrosion rate of 0.1678 mmpy at room temperature and continued to increase at a temperature of 80°C 3.7745 mmpy. Inhibitor efficiency was 53.51% at room temperature and decreased with increasing temperature to 4.5% at 80°C.
Corrosion Analysis on AMS 4050 Aluminum Metal in an Extreme Acid Rain Environment by Weight Loss Method I Gusti Ayu Arwati; Sagir Alva; Arif Fadilah; Yeyen Maryani
World Chemical Engineering Journal VOLUME 5 NO. 2 DECEMBER 2021
Publisher : Chemical Engineering Department, University of Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48181/wcej.v5i2.12613

Abstract

AMS 4050 aluminum metal which is a type of aluminum, with no Zn content, that composed of 5.7 - 6.7%Cu 2 - 2.6%, Mg 1.9 - 2.6%, Zr 0.15%, Si 0.15% and Mn 0.1% others 0.15% each. The advantage of aluminum is that it weighs only 2.7 gr / cm3, corrosion resistant, good electrical and heat transmitter, easy to fabricate or forge. This AMS 4050 material is widely used in the expansion industry to be used as an aircraft frame. MS 4050 aluminum is more resistant to cracking than other types of aluminum, however cracks can still occur due to corrosion due to acid rain. The test method used to calculate the corrosion rate is the weight loss method. The corrosion rate test results obtained with mean values for immersion of 1, 2, 3, and 4 weeks were 0.03, respectively; 0.07; 0.1 and 0.12 mg / cm2 h. EDX test results showed that the aluminum content in AMS 4050 metal decreased by 18.18%.
Co-Authors Arif Fadilah Dedi Sirait Euis N Febrina Ifani Fikri Syahbana Fina Fina Gian Villany Golwa Romahadi, Dedik Sagir Alva Wiwit S. Yeyen Maryani