Study on the corrosion inhibition of biomass carbon quantum dot self- aggregation on Q235 steel in hydrochloric acid

At present, the development of efficient green corrosion inhibitors has become one of the important directions of metal corrosion protection. In this paper, biomass carbon quantum dots (BCQDs) were prepared by hydrothermal reaction using biomass precursors. The optical properties and structural composition of the synthesized BCQDs were characterized in detail. After that, the corrosion inhibition performance of BCQDs was evaluated by EIS, Tafel, SEM and TEM. The elec-trochemistry and surface tests demonstrate that the aggregates can effectively prevent Q235 steel from corrosion in 1 M HCl medium at 298 K-328 K, with the maximum inhibition efficiency of 94.1 % at the concentration of 200 mg/L at 308 K. Finally, the corrosion inhibition mechanism was analyzed by FTIR, CA and XPS on the surface of the corroded carbon steel samples. The inhi-bition mechanism suggests that BCQDs can inhibit metal corrosion by self-aggregation and adsorp-tion on metal surface. This is owing to its small size effect and functional groups containing heteroatoms, easily forming dense protective film.(c) 2023 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This study prepared biomass carbon quantum dots (BCQDs) through hydrothermal reaction using biomass precursors and characterized their optical properties and structural composition in detail. The corrosion inhibition performance of BCQDs was evaluated using EIS, Tafel, SEM, and TEM. The results showed that BCQDs can effectively prevent Q235 steel from corrosion in 1 M HCl medium, with the maximum inhibition efficiency of 94.1% at a concentration of 200 mg/L at 308 K. The inhibition mechanism was analyzed by FTIR, CA, and XPS, suggesting that BCQDs can inhibit metal corrosion by self-aggregation and adsorption on the metal surface due to their small size effect and functional groups containing heteroatoms, easily forming a dense protective film.