In the article, the chamber protection of steel with octadecylamine, benzotriazole and binary inhibitors based on them was studied by corrosion and electrochemical methods. It is demonstrated that antagonism of protective action of octadecylamine and benzotriazole in the case of their introduction into the chamber in the form of homogenised mixture is primarily associated mainly with interaction of components in the inhibitor portion. From the perspective of practical utility, the discrete introduction of octadecylamine and benzotriazole into the chamber is more advantageous than the use of a homogenised mixture. The optimal method for protecting carbon steel is the introduction of equal amounts of octadecylamine and benzotriazole into the chamber by weight. The mechanism of action of the binary inhibitor can be defined as a blocking action. The protective effect of the aforementioned chamber inhibitors is associated with the stabilisation of the passive state of steel.