Chamber inhibitors of steel corrosion based on lauric acid, octadecylamine, and their mixtures

• A.Yu. Luchkin, I.V. Tsvetkova, I.A. Kuznetsov, O.S. Makarova, O.A. Goncharova, N.N. Andreev and S.S. Vesely

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation

Abstract: The protective effect of chamber corrosion inhibitors of steel based on lauric acid has been studied by electrochemical and corrosion methods. It has been found that its protective action can be enhanced by addition of octadecylamine or combinations of octadecylamine with benzotriazole or derivatives of the latter such as tolyltriazole and chlorobenzotriazole. All the formulations studied and their components have a blocking-activating mechanism of action, with predominance of the activation mechanism. The protective effect of the mixed inhibitors studied significantly exceeds that of their components. However, analysis of the mutual effects of the components indicates the lack of their synergistic interactions. Ellipsometric methods show that adsorption of the inhibitors studied hinders or prevents the growth of oxide on steel during the chamber treatment (CT). Nanoscale adsorption films are formed on the steel surface during the CT of steel with the inhibitors studied. There is no unambiguous relationship between their thickness and the protective aftereffect of chamber inhibitors, but the most efficient inhibitors form adsorption layers with a thickness of 10 nanometers or more.

Keywords: atmospheric corrosion, chamber inhibitors, lauric acid, vapor-phase protection of steel

Int. J. Corros. Scale Inhib., 2022, 11, no. 4, 1734-1748
doi: 10.17675/2305-6894-2022-11-4-21

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