Octadecylamine, 1,2,3-benzotriazole and a mixture thereof as chamber inhibitors of steel corrosion

Abstract

It has been shown that it is possible to create a technology for efficient protection of steel items by short-term treatment in vapors of low-volatile corrosion inhibitors in specialized chambers at elevated temperatures. It is suggested to call this technology based on the protection after-effect of adsorbed inhibitor films as "chamber treatment" and the compounds used therein as "chamber inhibitors". A number of methods (accelerated and field corrosion tests, potentiodynamic polarization measurements, ellipsometry, surface wetting angle measurement) were used to study the formation of adsorption films of 1,2,3benzotriazole (BTA), octadecylamine (ODA), and a mixture thereof on steel from a gas phase. It has been found that the temperature plots of the protection after-effect of the inhibitors studied have a maximum at 120°C. The adsorption films that stabilize the passive state of steel (both in the absence of chloride and in chloride-containing electrolytes) and noticeably hydrophobize the surface are already formed within one hour of chamber treatment. The adsorption films of ODA and its mixtures with BTA hinder steel corrosion initiation under conditions of recurrent moisture condensation more than 100-fold and have significantly better protective properties than the adsorption films of BTA. It has been found that adsorption of inhibitors hinders the thermal oxidation of steel. The total thickness of the surface layers on steel (oxide film and adsorbed inhibitor) responsible for the protection after-effect depends on the inhibitor nature but does not exceed 15 nm. It has been shown that treatment in vapors of ODA or its mixture with BTA markedly increases the corrosion resistance of low-carbon steel under weathering conditions and can be used for the interoperational protection of metal items.

Triazole derivatives as chamber inhibitors of copper corrosion

“…It has been shown [8][9][10][11][12][13][14] that films created on metal surfaces upon chamber treatment (CT) can ensure long-term protection from atmospheric corrosion even under drastic conditions. In this case:…”

Dendrimers as novel class of polymeric corrosion inhibitors: A review

“…The polar functional groups along with the non-bonding electrons of heteroatoms and pi-electrons of the multiple bonds behave as adsorption centres during interactions between inhibitor and metal surface. The interactions of inhibitors with metal result into their adsorption on the surface which is behaves as barrier for corrosion process [21][22][23][24][25][26][27].…”

Thin Benzotriazole Films for Inhibition of Carbon Steel Corrosion in Neutral Electrolytes

“…Among the perspective inhibitors, organic heterocyclic compounds capable of forming stable complexes with cations of the metallic substrate are extremely important [6][7][8][9][10][11][12][13][14][15][16][17]. The resulting ultrathin (several nm thick) protective films are often formed, which are resistant to the impact of the corrosive environment (humid and polluted atmosphere, aqueous electrolytes of soil) [6,16]. The interest to heterocyclic compounds as corrosion inhibitors for ferrous and nonferrous metals has remained high due to their relatively low working concentrations, high reactivity, and protective efficiency [8][9][10][11][12].…”

“…Benzotriazole (BTA) ( Figure 1) is a well-known corrosion inhibitor for copper and copper alloys that is most effective from heterocyclic compounds. Numerous works [6][7][8][9]17] have studied the corrosion copper alloys that is most effective from heterocyclic compounds. Numerous works [6][7][8][9]17] have studied the corrosion protective properties of BTA as well as its ability to form sparingly soluble compounds with cations of many metals (Ag, Cu, Zn, Fe, Ni, Co, and Pb ) [15,17].…”