IPTEK The Journal of Engineering
Vol 11, No 2 (2025)

Effect of Inhibitor Addition, pH, and Current Density on the Corrosion Rate of Fe Metals

Aulia, Anisa Fatma (Institut Teknologi Sepuluh Nopember)
Faizah, Nurul (Institut Teknologi Sepuluh Nopember)
Arifin, Rizal (Institut Teknologi Sepuluh Nopember)
Kaloka, Ardista Izdhihar (Institut Teknologi Sepuluh Nopember)
Thufailah, Gladys Sukma (Institut Teknologi Sepuluh Nopember)



Article Info

Publish Date
31 Aug 2025

Abstract

Corrosion significantly impacts public safety and the economy, causing substantial financial losses, infrastructure damage, and hazardous incidents across various industries. Researchers investigated the effects of pH, current density, and corrosion inhibitors (potassium chromate and potassium nitrate) on iron corrosion by measuring weight loss of iron samples immersed in sulfuric acid over time. The addition of inhibitors showed that KNO₃ was more effective in reducing the corrosion rate, with values of 4.992068, 3.744051, 2.736034, 1.728017, and 0.608008 mpy, compared to K₂CrO₄, which resulted in 9.728132, 7.296099, 5.472066, 3.648033, and 1.216017 mpy. Corrosion rate increased as pH decreased, with Fe showing corrosion at pH 6.21, 5.18, 4.26, 3.85, and 3.22. The relationship between current density and corrosion rate was found to be proportional, with voltage values of 1.31, 2.24, 3.16, 5.11, and 7.1 A/m². This study confirms that inhibitor type, acidity (pH), and current density significantly influence corrosion behavior, where increasing pH and current density can accelerate corrosion, and potassium nitrate (KNO3) demonstrates superior corrosion inhibition compared to potassium chromate (K2CrO4).

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Journal Info

Abbrev

joe

Publisher

Subject

Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Mechanical Engineering

Description

IPTEK The Journal of Engineering (E-ISSN: 2337-8557) is an academic journal on the issued related to engineering and technology. IPTEK The Journal of Engineering published first time in August 2014. From 2014-2018 (Volume 1-4) IPTEK The Journal of Engineering publish three issues (numbers) annually ...