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All Journal Indonesian Journal of Engineering and Science (IJES) Amwaluna: Jurnal Ekonomi dan Keuangan Syariah
Ramadhani, Muhammad Iqbal
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Economics, Econometrics & Finance Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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TEMPERATURE-DEPENDENT CORROSION OF AISI 1020, AL 1050, AND RIVETED JOINTS IN LANDFILL LEACHATE Gunawan, Gunawan; Hadi, Qomarul; Ramadhani, Muhammad Iqbal
Indonesian Journal of Engineering and Science Vol. 6 No. 2 (2025): Table of Contents
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51630/ijes.v6i2.102

Abstract

Corrosion is a critical degradation mechanism for metallic materials operating in aggressive environments such as landfills, where chloride-rich leachate, high moisture, and fluctuating temperatures accelerate electrochemical reactions. This study investigates the corrosion behavior of AISI 1020 carbon steel, Al 1050 aluminium, and their riveted joints under simulated landfill conditions at 30 °C, 40 °C, and 50 °C using the weight-loss method in accordance with ASTM G31-72. The landfill leachate used in this research contained high chloride, BOD, and COD levels, representing a chemically and biologically aggressive medium. Results show that AISI 1020 and Al 1050 experienced the highest corrosion rate at the early immersion stage (day 2), followed by passivation and a significant rate reduction by days 4 and 6. Increasing temperature accelerated initial corrosion for all materials, with Al 1050 showing greater susceptibility due to chloride-induced breakdown of its passive film. Riveted joints displayed much higher and less stable corrosion rates than single-material specimens, especially at elevated temperatures. Galvanic coupling between steel and aluminium, combined with crevice geometry at the rivet interface, intensified localized attack and disrupted protective oxide films. The most severe corrosion occurred in Al 1050 with riveted joints at 50 °C, reaching 0.523 mm/year on day 2. These findings highlight the combined roles of galvanic and crevice corrosion in riveted assemblies under landfill conditions and emphasize the need for careful material selection and joint design in waste management systems.
Rescuing Sharia Bank’s Performance from Emerging Financing Risks Using Capital Adequacy Saputri, Pungky Lela; Mariam Binti Setapa; M Fatchurrohman; Ramadhani, Muhammad Iqbal; Mutiani, Tika
Amwaluna: Jurnal Ekonomi dan Keuangan Syariah Vol. 10 No. 1 (2026): Amwaluna: Jurnal Ekonomi dan Keuangan Syariah
Publisher : UPT Publikasi Ilmiah UNISBA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29313/amwaluna.v10i1.5891

Abstract

This research investigates the impact of financing risk on the performance of Sharia banks in Indonesia, a critical issue given the increasing complexity of risk management in the Islamic banking sector. Specifically, it examines how Non-Performing Financing (NPF) affects Return on Assets (ROA) and evaluates whether the Capital Adequacy Ratio (CAR) can moderate this relationship. A quantitative approach was employed using Moderated Regression Analysis (MRA), with secondary data drawn from Indonesian Sharia banks registered with the Financial Services Authority (OJK) and consistently publishing financial statements from 2016 to 2022. The results indicate that NPF has a negative and significant effect on ROA. Meanwhile, CAR not only has a direct positive and significant effect on ROA but also plays a moderating role by mitigating the adverse impact of NPF on bank performance.
Co-Authors Gunawan Gunawan M Fatchurrohman Mariam Binti Setapa Mutiani, Tika Qomarul Hadi Saputri, Pungky Lela