article · International Journal of Electrochemical Science
This research evaluates two newly synthesised chemical inhibitors derived from quinoline structures, named MPQ and AAQ, for protecting mild steel against corrosion. Iron and its alloys face degradation in harsh environments, especially under acidic and chloride-rich settings such as hydrochloric acid. Through electrochemical analysis, the compounds demonstrated marked corrosion inhibition efficiencies, reaching 92.37 percent for MPQ and 84.13 percent for AAQ. Surface analyses using scanning electron microscopy, energy dispersive X-ray analysis, atomic force microscopy, and contact angle measurements confirmed that the substances create a protective barrier film on the steel surface to slow degradation. Computational calculations further clarified the adsorption behaviour and protective mechanisms involved in how these compounds adhere to mild steel surfaces.
Iron and steel are essential materials across industrial infrastructure, but they rapidly degrade when exposed to harsh acids and salts. Finding effective chemical additives that coat and shield metal surfaces helps prolong the working lifespan of critical equipment, decrease costly maintenance, and prevent structural failures caused by corrosive environmental exposure.
The findings point towards applications in industries and infrastructure that require corrosion protection for mild steel in acidic environments. Potential users include chemical processing facilities and asset managers maintaining steel infrastructure exposed to hydrochloric acid. The research is currently at an early, laboratory-based stage, having demonstrated effectiveness through experimental electrochemistry, surface imaging, and theoretical modelling.
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Corrosion poses a significant threat to the integrity and longevity of iron and its alloys, which are crucial materials for modern industry and infrastructure. This study investigates the effectiveness of two recently synthesized inhibitors based on quinoline structures: MPQ ( 2-methyl-5-(propoxymethyl) quinolin-8-ol ) and AAQ (((( 2-aminoethyl)amino)methyl)-2-methylquinolin-8-ol ) in protecting steel against environmental degradation, particularly in acidic and chloride-rich conditions such as hydrochloric acid. The inhibitors exhibited significant corrosion inhibition efficiencies of 92.37 % for MPQ and 84.13 % for AAQ, as demonstrated through electrochemical analysis. Surface characterization techniques, including SEM-EDX(Scanning Electron Microscopy with Energy Dispersive X-ray analysis), AFM (Atomic Force Microscopy), and contact angle measurements, revealed the formation of a protective barrier film that reduces the corrosion rate. Additionally, theoretical calculations using the Gaussian package provided insights into the adsorption behaviors and protective mechanisms of the inhibitors on mild steel surfaces. The findings contribute to the ongoing search for viable corrosion inhibitors, offering prospects for application in industries and critical infrastructures to enhance corrosion protection and durability.
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DOI: 10.1016/j.ijoes.2024.100772
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