Lauric acid, octadecylamine, benzotriazole and its derivatives, as well as mixtures of these compounds as chamber corrosion inhibitors of steel

Abstract

The protective effect of chamber steel corrosion inhibitors based on lauric acid has been studied by electrochemical and corrosion methods. It has been established that its protective effect can be enhanced by additives of octadecylamine, as well as octadecylamine and benzotriazole or its derivatives-tolyltriazole and chlorobenzotriazole. The mechanism of action of all studied compositions and their components is blocking-activating, with a predominance of activation. The protective effect of the studied mixture inhibitors considerably exceeds the protective effect of the components. Nevertheless, an analysis of the mutual influence of the components indicates the absence of their synergistic interactions. It was shown by ellipsometric methods that adsorption of the studied inhibitors inhibits or prevents oxide growth on steel during chamber treatment. During chamber treatment of steel with the studied inhibitors nanosized adsorption films are formed on its surface. There is no unambiguous correlation between their thickness and the protective effect of chamber inhibitors, but the most effective compositions are characterized by the thickness of the adsorption layers of 10 nanometers or more.