Chamber corrosion inhibitor of zinc plated steel IFKhAN-154

• A.Yu. Luchkin¹, O.S. Byvsheva^1,2, O.A. Goncharova¹, N.N. Andreev¹ and S.S. Vesely¹

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
² D. Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, 125047 Moscow, Russian Federation

Abstract: A combination of methods (voltammetry, electrochemical impedance spectroscopy, and salt fog chamber) was used to study the corrosion and electrochemical behavior of zinc plated steel treated in the vapors of the IFKhAN-154 inhibitor. It was found that IFKhAN-154 efficiently inhibited corrosion by slowing down the anodic dissolution of zinc and stabilizing its passive state. The optimum temperature of chamber treatment (CT) with IFHAN-154 is 100°C. Chamber treatment at lower or higher temperatures decreases the protective aftereffect of the adsorption films formed by the inhibitor. IFKhAN-154 was shown to be an inhibitor with mixed activation-blocking action. The surface films formed during the chamber treatment of zinc plated steel have a self-organization capability. Exposure of samples in air after chamber treatment results in an increase in the protective ability of the surface layers. The data obtained allow us to assume the following general picture of the chamber protection of zinc plated steel. During its chamber treatment, the inhibitor is physically adsorbed on the sample surface. As a liquid acid, IFKhAN-154 begins to react with the surface oxide and with zinc itself. This process results in poorly soluble salts that ensure metal protection. The reaction continues when the samples are kept in air after the completion of the CT. It is accompanied by changes in the thickness and uniformity of the coating, as well as an increase in the protective properties of the surface films. In about a day, IFKhAN-154 present on the surface is exhausted, and the protective effect of the surface layers ceases to grow.

Keywords: zinc plated steel, corrosion, chamber treatment, corrosion inhibitors, IFKhAN-154, adsorption films, self-organization

Int. J. Corros. Scale Inhib., 2021, 10, no. 2, 662-675 PDF (527 K)
doi: 10.17675/2305-6894-2021-10-2-12

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