Cucumber peel extract as an eco-friendly corrosion inhibitor for low-carbon steel in sulfuric acid

• N.H. Kurshed¹, A.A. Khadom², H.S. Ahmed³, M.K. Mohammed⁴, B.M.N. Jasam⁴, T.S. Gaaz⁵, L.M. Shaker⁶ and A.A.A. Alamiery^6,7

¹ College of Agriculture, University of Diyala, P.O. Box: 32001, Diyala, Iraq
² Department of Chemical Engineering, College of Engineering, University of Diyala, P.O. Box: 32001, Diyala, Iraq
³ Presidency of Diyala University, P.O. Box: 32001, Diyala, Iraq
⁴ Department of Chemistry, College of Education for pure science, University of Diyala, P.O. Box: 32001, Diyala, Iraq
⁵ Air Conditioning and Refrigeration Techniques Engineering Department, College of Engineering and Technologies, Al-Mustaqbal University, Babylon 51001, Iraq
⁶ Scientific Research Center, Al-Ayen University, Thi-Qar, Iraq
⁷ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia

Abstract: This study investigates the use of cucumber peel extract (CPE) as a sustainable and eco-friendly corrosion inhibitor for low-carbon steel in 0.5 M sulfuric acid (H₂SO₄). The research aims to address the environmental concerns associated with traditional corrosion inhibitors by exploring the potential of natural, biodegradable substances. The effects of temperature and inhibitor concentration on corrosion rates were examined using the weight loss method, providing a quantitative measure of the corrosion process. Results demonstrate that CPE significantly reduces the corrosion rate of low-carbon steel in acidic environments, making it a promising alternative to synthetic inhibitors. The inhibition efficiency of CPE was found to increase with higher inhibitor concentrations but decrease with rising temperatures. The highest inhibition efficiency recorded was 87.4% at 30°C with a CPE concentration of 10 mL/L, indicating substantial protection under optimal conditions. Adsorption studies revealed that CPE’s behavior adheres to the Langmuir adsorption isotherm model, suggesting monolayer adsorption on the steel surface. This study highlights the potential of cucumber peel extract as an effective and environmentally friendly corrosion inhibitor, encouraging further exploration and application of natural extracts in corrosion prevention. The findings provide a basis for the development of green corrosion inhibitors that can contribute to sustainable industrial practices.

Keywords: friendly inhibitor, weight loss, adsorption, FTIR, acid corrosion

Int. J. Corros. Scale Inhib., 2024, 13, no. 3, 1687-1701
doi: 10.17675/2305-6894-2024-13-3-19

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