Facile and eco-friendly synthesis of CdS quantum dots for enhancing corrosion inhibition of Zn metal plate in various environments

In this work, cadmium sulfide quantum dots (CdS QDs) has been synthesized via sonochemical green synthetic protocol with Delonix elata leaves water extract act as a capping and stabilizing agents. The phase, crystalline nature, structural arrangement, optical absorbance and electrical responses of the CdS QDs were studied using XRD, FESEM, HRTEM, UV-Vis analysis. The corrosion inhibition performance of CdS QDs corrosion inhibitor was tested in the presence of electrolyte mediums namely 1M HCl, 6M KOH, and 3.5% NaCl. The Tafel polarization curve shows that the corrosion rate of the zinc (Zn) plate is reduced when the plate were coated with CdS QDs under all aqueous electrolytes, particularly at a 3.5% NaCl medium.