Bingöl propolis self-assembled monolayer films: Preparation, characterization and application as corrosion inhibitors for copper protection in NaCl environment

Protective thin films prepared from natural products can be used as an economical, efficient and environmentally friendly method to mitigation corrosion. The aim of this study is to prepare self-assembled monolayer (SAM) films of Bingöl propolis (B-PP) sourced from the northern regions of Bingöl province (Adaklı, Kiğı, Yayladere, and Yedisu) under various experimental conditions for the protection of copper against corrosion in a 3.5 % NaCl environment. The B-PP/SAM films were prepared under various conditions including different solvents, film formation times, and B-PP concentrations. The protective performance of the B-PP/SAM films was evaluated using various electrochemical techniques and the films were characterized using various surface characterization techniques. It was found that highly adherent, dense and aesthetically pleasing B-PP/SAM films were homogenously prepared on the copper surface. The assembly conditions significantly influence both the appearance and electrochemical properties of the films. The most effective B-PP/SAM films for copper protection were prepared using ethanol as a solvent containing 1000 ppm B-PP after a 24 h film formation time. According to potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) results, the protection efficiencies were 95.3 %, 95.5 % and 96.8 %, respectively. [Display omitted] •Bingöl Propolis SAM films were assembled on copper in various solvents, concentrations and film formation times•Uniform, thin, dense and adherent Bingöl Propolis-SAM films were assembled on copper•The quality and appearance of the films as well as their corrosion protection abilities strictly dependends on preparation conditions•The best film was assembled in ethanol as a solvent containing 1000 ppm propolis after 24 h film formation time•The corrosion protection ability of the Bingöl Propolis-SAM films at optimum conditions reaches 96.8 %