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Yudha Pratesa
Department of Metallurgical and Materials Engineering, Universitas Indonesia, Indonesia
Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Study of the Effect of Volume of Moringa Leaves and Purple Sweet Potato Extracts as a Green Corrosion Inhibitor on the Corrosion of API 5L Steel Metals in 0.2 M HCl Environments Kezia; Yudha Pratesa; Tio Angger Pertama; Johny Wahyuadi Soedarsono
Recent in Engineering Science and Technology Vol. 3 No. 4 (2025): RiESTech Vol. 3 No. 4 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i04.120

Abstract

This study aimed to investigate the corrosion inhibition mechanism of moringa leaves extract (Moringa oleifera) and purple sweet potato extract (Ipomoea batatas) extract as environmentally friendly inhibitors for low carbon API 5L steel in a 0.2 M HCl solution. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were conducted with varying concentrations and combinations of the two inhibitors to evaluate their corrosion inhibition performance. The results indicated that both inhibitors individually function effectively as green corrosion inhibitors. However, their combination did not offer adequate protection for API 5L steel in a 0.2 M HCl environment. FTIR analysis of the inhibitors confirmed the presence of flavonoid compounds in both extracts. Potentiodynamic polarization tests showed that increasing the concentration of moringa leaves extract resulted in a decrease in the corrosion rate and an increase in %IE, with the highest efficiency reaching 73.08%. Similarly, an increase in the volume of purple sweet potato extract also resulted in a reduced corrosion rate, with a maximum inhibition efficiency of 65.31%. However, the combination of both inhibitors led to an increase in the corrosion rate. The results of the EIS test demonstrated that both inhibitors protect the metal by forming a protective film layer on its surface. The adsorption behavior of the inhibitors corresponds to a physical adsorption process and aligns with the Langmuir adsorption isotherm model.
A Review on Strengthening Asset Integrity Management through Risk-Based Inspection In Hydrocarbon Piping Systems Edy Karina; Yudha Pratesa; Johny Wahyuadi Mudaryoto
Recent in Engineering Science and Technology Vol. 4 No. 3 (2026): Articles in Press
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v4i3.161

Abstract

Hydrocarbon piping systems are critical assets in oil and gas facilities because they operate under pressure, temperature, fluid variability, and corrosive environments that can accelerate material degradation. This study develops a risk-based integrity evaluation framework for hydrocarbon piping systems by integrating corrosion rate assessment, remaining life estimation, and Risk-Based Inspection (RBI) prioritization within an Asset Integrity Management (AIM) perspective. A quantitative case study was conducted using 2025 inspection data from hydrocarbon and utility piping systems at PT X. The evaluation followed the principles of API RP 580 and API RP 581 and used ultrasonic thickness measurement, actual wall thickness, minimum required thickness, corrosion rate, remaining life, Probability of Failure (PoF), Consequence of Failure (CoF), and risk ranking. The results show that most piping systems were categorized as Very Low Risk, while several lines remained in the Medium Risk category. Utility Water Piping had the highest corrosion rate of 0.253 mmpy and the shortest remaining life of 8 years. Hydrocarbon Gas Piping had a lower corrosion rate of 0.076 mmpy and a remaining life of 38 years. The proposed framework strengthens inspection prioritization, risk-based maintenance, and long-term AIM implementation.
Co-Authors Edy Karina Johny Wahyuadi Mudaryoto Johny Wahyuadi Soedarsono Kezia Tio Angger Pertama