Inhibition properties of anticorrosion pigment based on a natural montmorillonite in epoxy coating on steel

Keywords

anti-corrosion pigment, montmorillonite, corrosion inhibition, epoxy coating, steel, electrochemical impedance spectroscopy.

Cite as

Danyliak M.-O. M., and Datsko B. M. Inhibition properties of anticorrosion pigment based on a natural montmorillonite in epoxy coating on steel. Physicochemical Mechanics of Materials. 2025. 61(1), 094–102.

DOI: https://doi.org/10.15407/pcmm2025.01.094

Abstract

Environmentally friendly anticorrosion pigments for paint coatings based on the natural montmorillonite mineral modified with zinc cations and phosphate anions were obtained by two-stage liquid phase ion exchange. It is established that the corrosion resistance of steel 20 increases in the acid rain environment with the addition of modified Zn/Р-montmorillonite using the potentiodynamic polarization method. The inhibiting efficiency of Zn/Р-montmorillonites depends on the modification, namely, the concentration of the Na₃PO₄ solution, and increases in the order: 0.005 M < 0.5 M < 0.05 M. The modified montmorillonite was introduced into an epoxy coating on steel. The 20 wt% content of Zn/Р-montmorillonite increases almost 6 times the protective properties of the coating, which is confirmed by the results of electrochemical impedance spectroscopy. This is associated with an improvement of barrier properties and the formation of a protective film based on zinc hydroxides and iron phosphates in defects of epoxy coating on steel surface.

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