Preparation of water-dispersible corrosion inhibitors for composite lacquer coatings with excellent properties

Corrosion resistant coatings based on eco-friendly and low-volatile organic compounds have received attention in recent years. In this work, the water-dispersible corrosion inhibitors were prepared from lignin, aniline, and 4-fluoroaniline. We achieved different polymer inhibitors with excellent optimum synergistic effects, and the resulting was shown that the excellent dispersion of inhibitors in deionized water were stable for 3 h, compared to polyaniline (PANI) after 10 min of storage. Then, those inhibitors subsequently composited into the natural lacquer to generate anti-corrosion coatings. As revealed by electrochemical measurements, including Tafel polarization curves and electrochemical impedance spectroscopy (EIS), the composite coatings were exhibited outstanding chemical properties in different corrosive medium. The resulting showed that the corrosion performance of composite lacquer coatings were remarkably improved compared with pure lacquer coating, especially L/PF-73-10 coating.