Characterization for Different Temperatures to Achieve Sustainable Protection by Using an Eco-Friendly Corrosion Inhibitor (SiO₂-NPs) Synthesized in the Lab

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This study evaluates the effect of temperature variations on the corrosion rates of A106 Grade B steel using dynamic polarization and weight-loss methods. Carbon steel samples were immersed in a 1-molecular-concentration hydrochloric acid electrolyte solution at different temperatures ranging from 25 to 55°C, with or without inhibitors at different concentrations, for a specified period. In this study, nano silica was synthesized in the laboratory using a Sol-gel process to serve as an environmentally friendly corrosion inhibitor derived from natural sand (Najaf, Iraq). The results demonstrate the effectiveness of the inhibitor, producing favorable corrosion rates even at high temperatures in its presence, while corrosion rates decreased in the absence of added inhibitor concentrations (400–1000 ppm). The results and statistical data were analyzed using Tafel and CR plots, Arrhenius analysis (ln (CR) vs. 1/T), and percentage inhibition ratios. Corrosion rates, current densities, and Tafel constants (CR, icorr., βc, βa) were determined during polarization, while the weights of the inhibitor-treated and non-inhibited samples were evaluated during weight loss studies. Tests (XRD, FTIR, AFM, TGA/TDS, and SEM) demonstrated the achievement of the work goal of developing a protective silicate layer of silica (SiO2) nanoparticles, which provided effective and durable protection of the target metal surface samples from corrosion, especially under temperature fluctuations.

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Materials Science Forum (Volume 1189)

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109-125

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May 2026

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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