Metals are inevitably and spontaneously degraded through corrosion, which occurs when they interact physically, chemically, and biologically with their surroundings. Metallic corrosion is extremely destructive and has a negative influence on both the environment and human life. Mild steel (MS) holds a key position in the structural materials and has emerged as the top choice for engineering applications due to its good mechanical qualities and affordable cost.
Due to their low cost, great chemical stability, strong water solubility, and benign qualities, carbon dots (CDs), primarily heteroatom-doped CDs, have gained recognition as effective environmentally friendly corrosion inhibitors. In the current research, two nitrogen-doped eco-friendly CDs (CD1 and CD2) were synthesized employing a one-step hydrothermal approach, and their anticorrosion performance for mild steel (MS) in a 15 % HCl solution was examined. Briefly, for the synthesis of CD1, an equimolar mixture of glucose and arginine was dissolved in 30 mL double distilled water and sonicated for 60 s. for complete dissolution. The resulting solution was carefully poured into an autoclave and placed in an oven for 8 h at 180 °C. After the completion of reaction, the autoclave was cooled at room temperature and the product was filtered.
Various methods like Electrochemical impedance spectroscopy (EIS), potentiodynamic tests, and weight loss have been used to examine the anticorrosion effectiveness of CD1 and CD2, and it recently was discovered that the results are consistent at all concentrations. Both inhibitors' effectiveness at preventing corrosion rises with concentration, reaching 96.8% (CD1) and 94.7 % (CD2) after 6 hours of immersion at 150 ppm concentration. Inhibitors CD1 and CD2 adhered to the physical adsorption process and Langmuir adsorption isotherm while adhering to MS. According to a Potentiodynamic polarization research, CD1 and CD2 simultaneously change the rates of the cathodic hydrogen evaluation reaction and anodic dissolution of MS. This suggests that they function as mixed type inhibitors. The atomic force microscopy (AFM), XPS, and field emission scanning electron microscopy (FESEM) experiments all supported the production of protective film of inhibitor molecules at the MS surface.
Thus, The Carbon dots CD1 & CD2 offers corrosion inhibition efficiency of 96.8 % and 94.7 %, respectively, at 303 K and 150 ppm concentration. The inhibitor CD1 is better inhibitor than CD2 due to presence of more active sites and planner structure.
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