Bingöl Pollen Self-Assembled Natural Thin Films: Fabrication, Characterization, and Corrosion Inhibition Performance for Copper Protection in a NaCl Environment

This study investigates the fabrication of Bingöl pollen (B-pollen) self-assembled films (B-pollen/SAM) on Cu and their corrosion protection performance in a 3.5% NaCl solution. The films were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle studies. Various electrochemical techniques were employed to examine the influence of some film preparation parameters, including solvent, film formation time, and B-pollen concentration, on film quality and corrosion inhibition efficiency. The characterization results showed that orange-brown films formed on the Cu surface, exhibiting strong adhesion to the metal, and had a highly homogeneous distribution. The films effectively reduced the corrosion rate of copper in a 3.5% NaCl solution. The quality and corrosion inhibition efficiency of the films depend on the preparation conditions. The optimal B-pollen/SAM film for inhibiting copper corrosion was prepared using a 1000 ppm B-pollen solution in water with an assembly time of 24 h. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and linear polarization resistance (LPR) data indicated that the protection efficiencies reached 98.45, 97.2, and 97.7%, respectively.