TY - JOUR ID - 39214 TI - Marine Octocoral Phyllogorgia dilatata: Identification of Sesquiterpenes and Activity as a Natural and Renewable Corrosion Inhibitor JO - Analytical and Bioanalytical Electrochemistry JA - ABEC LA - en SN - - AU - Fernandes, Caio Machado AU - S. F. Fagundes, Thayssa da AU - E. dos Santos, Nazir AU - do Amaral, Bruno Sergio AU - B. Cass, Quezia AU - L. Valverde, Alessandra AU - M. Silva, Júlio César AU - C. Alves, Odivaldo AU - A. Ponzio, Eduardo AD - Materials Laboratory, Chemistry Institute, Federal Fluminense University, Niterói, Rio de Janeiro, 24020-141, Brazil AD - Natural Products Laboratory, Chemistry Institute, Federal Fluminense University, Niterói, Rio de Janeiro, 24020-141, Brazil AD - Separare - Chromatography Research Center, Chemistry Department, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil AD - Federal Institute of Education, Science and Technology of São Paulo - Campus Pirituba, São Paulo, São Paulo, 05110-000, Brazil Y1 - 2020 PY - 2020 VL - 12 IS - 4 SP - 437 EP - 457 KW - Phyllogorgia dilatata KW - Natural corrosion inhibitor KW - Mild steel KW - Acidic medium Electrochemical measurements KW - Surface characterization DO - N2 - In the context of highly efficient, non-toxic and natural organic corrosion inhibitors, Phyllogorgia dilatata was studied as an anticorrosive for mild steel in acid medium. The marine octocoral crude extract (PDCE) was characterized and analyzed by LC-HRMS, revealing the presence of 16 different organic molecules. The corrosion inhibition was evaluated via weight loss study and electrochemical techniques. The obtained polarization curves showed that PDCE acts as a mixed-type inhibitor and gravimetric, Electrochemical Impedance Spectroscopy and Linear Polarization Resistance analyses reached an average maximum anticorrosive efficiency of 93.4% at 1 g L-1. The data crossing between gravimetric and electrochemical measurements indicated that the protection mechanism is due to adsorption, blocking electro-active sites. The adsorption data followed the Freundlich theory and SEM/EDX images confirmed the formation of a protective multilayer film. UR - https://www.abechem.com/article_39214.html L1 - https://www.abechem.com/article_39214_e2013789725ff2961e0bdb3b342aaf73.pdf ER -