Chamber protection of galvanized steel. 2. IFKhAN-121, IFKhAN-154 and some mixed inhibitors

• O.S. Makarova¹, A.Yu. Luchkin¹, O.A. Goncharova¹, S.S. Vesely¹ and N.N. Andreev^1,2

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
² Federal State-Funded Educational Institution of Higher Education “D. Mendeleev University of Chemical Technology of Russia”, Miusskaya sq. 9, 125047 Moscow, Russian Federation

Abstract: Electrochemical and corrosion methods were used to study the capability of carboxylic acids (IFKhAN-121 and IFKhAN-154), their mixtures with polyamine A and octadecylamine, and a mixture of oleic acid with polyamine A to provide chamber protection of galvanized steel and steel items with a zinc coating that is either partially removed or defective. It was shown that the corrosion-electrochemical behavior of galvanized steel with a low-defective coating is determined by the properties of the zinc coating. In this case, the protective effect of the chamber inhibitors (CIN) studied is due to suppression of active zinc dissolution and stabilization of its passive state. It has been found that ranking of the CIN based on voltammetric methods, EIS, and corrosion experiments results in different series of increasing efficiency. The reasons for the differences in the results of potentiodynamic and EIS tests are due to the weakness of electric fields formed during impedance measurements near E₀, which do not intensify film destruction. The presence of chlorides in the model electrolytes used in the electrochemical tests and their absence in the corrosion experiments may be the reason for the differences in the results of these experiments. It has been found that chamber protection of galvanized items with low-defective coatings should preferably be performed using IFKhAN-121 that is the best inhibitor according to the results of corrosion tests and one of the three leaders according to the of voltammetry and EIS data. In the chamber protection of galvanized products with defective coatings, preference should be given to mixtures of IFKhAN-154 with PA and IFKhAN-121 with ODA that provide efficient protection of both the zinc coating and the steel substrate.

Keywords: galvanized steel, corrosion, chamber inhibitors, voltammetry, electrochemical impedance spectroscopy

Int. J. Corros. Scale Inhib., 2022, 11, no. 2, 762-773
doi: 10.17675/2305-6894-2022-11-2-21

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