Inhibition behavior of N-doped carbon quantum dots derived from Camellia oleifera shell for carbon steel in HCl

摘要

Carbon quantum dots (CQD), one of the most common zero -dimensional carbon nanomaterial, show great applied pote ntial in the field of corrosion inhibition, owing to the advantages of wide sources, low price and environmental friendliness. In this work, a novel N -doped carbon quantum dots (N -CQD) were synthetized using a hydrothermal method with Camellia oleifera shells (COSE) as the raw materials. The chemical compositions of the as-prepared N-CQD were comprehensively analyzed by transmission electron microscopy (TEM), X -ray photoelectron spectroscopy (XPS), and infrared absorption spectroscopy (FTIR). The correspond ing corrosion inhibition effect of N-CQD for carbon steel in 1.0 M HCl solution was systematically studied by weight loss method, electrochemical impedance spectroscopy, and potentiodynamic polarization tests. Moreover, the protective effect and also hydro phobic properties of carbon steel modulated by N -CQD in HCl were further investigated by atomic force microscopy (AFM), contact angle tests, and also other techniques. Scanning electron microscopy (SEM) and X -ray photoelectron spectroscopy (XPS) were emplo yed to inspect the morphology and compositions of carbon steel influenced by N-CQD in 1.0 M HCl solution. All these above -mentioned results show that the novel green N -CQD prepared by COSE can effectively restrain the corrosion of carbon steel in 1.0 M HCl, which can always afford the inhibition efficiency of >87% within 20 -30 C. The deep analysis of electrochemical test results reveals that the N -CQD can inhibit both the cathodic and anodic reactions, thus leading to excellent anti-corrosion performance.