Gum Arabic modified fluorescent black phosphorus quantum dots corrosion inhibitor

Preparing compound reagents with multiple functions are the key technologies that are lacking in the application of corrosion inhibitors. In this work, we devoted to constructing a fluorescent and water-soluble black phosphorus quantum dots corrosion inhibitor based on the modification of Gum Arabic (GA-BPDs) and exploring its combined performance. Optical studies revealed GA-BPDs exhibited a fluorescence quantum yield (FQY) of 31.76 % and stable fluorescence characteristics, conferring the fluorescence tracing function and offering an accurate approach for determining the residual amount. Weight loss and electrochemistry studies demonstrated GA-BPDs exhibited an inhibition efficiency of 91.36 % for 100 mg/L in 0.5 M HCl solution at 25 °C. SEM, EDS, WCA, 3D-LSM, AFM, TOF-SIMS, and XPS analyses affirmed GA-BPDs adsorbed onto the surface of Q235 carbon steel, thereby forming a protective film with the metal surface via the coordination bond formed directly between the inherent lone pair electrons of P atoms and the empty three-dimensional orbitals of iron atoms, which would contribute to the enhanced corrosion protection. This work is anticipated to offer a theoretical foundation and technical support for applications of quantum dot in industrial circulating cooling water systems and promote the advancement of a new generation of fluorescent corrosion inhibitor technologies.