Inhibition Effect of Gold Nanoparticles Embedded in Gloss Paint on Corrosion of Mild Steel in HNO3 Solution
DOI:
https://doi.org/10.63746/njtd.v22i1.3379Keywords:
Corrosion, gasometric analysis, gravimetric analysis, gold nanoparticles, paint coating, Embedded SystemsAbstract
Corrosion is a common and inevitable process in engineering materials, particularly metals. This study investigated the effectiveness of gold nanoparticles (AuNp) as a corrosion inhibitor for mild steel in a 2 M HNO₃ environment. Mixtures of AuNp with gloss paint were prepared at concentrations of 0, 5, 10, 15, and 20 µg/ml to coat the surface of mild steel. The corrosion behaviour was evaluated using gravimetric and gasometric analyses. Weight loss and inhibition efficiency were measured after exposing the samples to the corrosive environment for 24, 48, 72, 96, and 120 hours, while hydrogen evolution was recorded at 10-minute intervals over 0 to 160 minutes of exposure. The findings indicated that the corrosion rate increased with exposure time but decreased as the concentration of AuNp increased. The inhibition efficiency of AuNp decreased over time but increased with higher concentrations, with the 20 µg/ml sample showing the highest inhibition efficiency of 90% at 20 hours. The gasometric analysis further confirmed that higher AuNp concentrations led to reduced hydrogen evolution, demonstrating the potential of AuNp as a corrosion inhibitor for mild steel in HNO₃ solutions. Gravimetric and gasometric analysis showed the inhibitory effect of AuNp in mild steel corrosion in HNO3, which can be applied in several engineering industries to inhibit corrosion.
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