CORROSION UNDER INSULATION MEDIA AIR LAUT DAN AIR RAWA PADA PENGELASAN BAJA A36 YANG DI-PREHEAT

PUTRA, MUHAMMAD DEAN ANWARSYAH and Pratiwi, Diah Kusuma and Utami, Nurhabibah Paramitha Eka (2023) CORROSION UNDER INSULATION MEDIA AIR LAUT DAN AIR RAWA PADA PENGELASAN BAJA A36 YANG DI-PREHEAT. Undergraduate thesis, Sriwijaya University.

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Abstract

In general, corrosion damages material surfaces due to the presence of chemical compounds, especially in metals undergoing electrochemical reactions. The estimated impact of this damage is approximately 1.5% of the Gross National Product. Currently, the application of insulation as a preventive measure against corrosion in the industrial sector has significantly increased. Corrosion beneath insulation layers is caused by the trapping of water on surfaces covered by insulation. This study aims to analyze and evaluate the corrosion rate, hardness testing, impact testing, and metallographic testing of corrosion under insulation on A36 steel corroded with seawater and preheated swamp water before welding. The ASTM A36 steel, with dimensions of 100x100x10 mm, is preheated at temperature of 150°C and welded using E7018 electrodes. Subsequently, dye penetrant testing and weighing processes were conducted, followed by insulating the material with PVC tape on all parts except the top. The final step involved immersing the material for 7 days and 14 days in seawater and swamp water before a series of tests were conducted. Based on the test results, the highest corrosion rate for the 7-day specimen without insulation in swampwater immersion was 0.0999 mpy. The highest hardness value for specimens immersed in swampwater was 132 BHN. Meanwhile, the highest hardness value for specimens in seawater was 125 BHN. Impact testing results showed that the specimen with 14 days of swampwater immersion had the highest value at 151 Joules. The preheating and welding processes resulted in a metallographic structure dominated by acicular ferrite and widmanstatten phases.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	ASTM A36, corrosion under insulation, welding, preheat
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1-1570 Mechanical engineering and machinery
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Muhammad Dean Anwarsyah Putra
Date Deposited:	21 Nov 2023 05:59
Last Modified:	21 Nov 2023 05:59
URI:	http://repository.unsri.ac.id/id/eprint/130803

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