Inhibitory properties of an ion-exchange anti-corrosion pigment based on the natural montmorillonite for paint coatings

Environment-friendly anti-corrosion pigments for paint coatings based on the natural montmorillonite mineral modified with zinc cations were obtained by the liquid phase ion exchange method. It was established by the methods of potentiodynamic polarization and electrochemical impedance spectroscopy that the corrosion resistance of aluminum alloy increased in the acid rain environment with the obtained pigment. The surface morphology of the AA2024 aluminum alloy after exposure to inhibited environments and the protective mechanism of modified montmorillonite in acid rain were studied using scanning electron microscopy. It was established that the protection degree in such an environment with Zn-montmorillonite for aluminum alloy is above 90%. The obtained modified montmorillonite can be a promising anti-corrosion pigment for protective paint coatings.