CHITOSAN AS A GREEN CORROSION INHIBITOR FOR CARBON STEEL: PHYSICAL-CHEMICAL AND ELECTROCHEMICAL CHARACTERIZATION

• DOI: https://doi.org/10.22533/at.ed.3174252421103

• Palavras-chave: Chitosan, green corrosion inhibitor, corrosion, carbon steel

• Keywords: Chitosan, green corrosion inhibitor, corrosion, carbon steel

• Abstract: Some natural polymers, such as chitosan, have emerged as promising corrosion inhibitors for metals due to their ability to form complexes with metal ions and create a protective barrier on metal surfaces. In this study, a commercial chitosan was characterized using techniques such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA), and its performance as a corrosion inhibitor was evaluated using potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS). The physicochemical characterization revealed mineral impurities and thermal degradation above 280°C, which could limit its use in certain industrial systems. Electrochemical tests showed that as the chitosan concentration increased, the corrosion potential (Ecorr) shifted to a more noble value and the charge transfer resistance also increased. Chitosan effectively inhibited carbon steel corrosion in an acidic sodium chloride solution, achieving an inhibition efficiency of over 70% at 800 ppm, highlighting its potential as a sustainable solution for mitigating corrosion.