Abstract
Using a set of physicochemical (ellipsometry and contact angle measurements), electrochemical (electrochemical impedance spectroscopy and polarization measurements), and corrosion (periodic moisture condensation and salt fog tests) methods, the properties of adsorption films formed on copper by the chamber method from vapors of benzotriazol (BTA), 1H-1,2,4-triazole, tolyltriazole (TTA), 5-chloro-1,2,3-benzotriazole (CBTA), 3-amino-1H-1,2,4-triazole, and 4-amino-1H-1,2,4-triazole at a temperature of 100°C are studied. It is shown that 1-h chamber treatment of copper with vapors of these compounds leads to the formation of nanoscale hydrophobic adsorption films on it, which inhibits the thermal growth of oxides, but stabilizes the passive state of the metal and increases its corrosion resistance. Among these different triazole compounds tested as chamber corrosion inhibitors, BTA and its substituted derivatives are distinguished. After a 1-h chamber treatment of copper, the protective aftereffect of the adsorption films of triazole derivatives grows symbatically with their saturated vapor pressure at the chamber treatment temperature, i.e., in the following increasing order: CBTA < TTA < BTA. This may indicate that the equilibrium adsorption films do not have time to form at 100°С on the metal within this time period. After a prolonged (24 h or more) chamber treatment of copper with vapors of substituted benzotriazoles, equilibrium adsorption films of inhibitors are formed on it. In this case, the influence of the chamber inhibitor properties on their protective aftereffect alternates. Under such conditions, the least volatile and most hydrophobic substituted benzotriazole, i.e., CBTA, provide the best metal protection.
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Notes
P is the coefficient of distribution of a compound in the octanol–water two-phase system.
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Funding
This study was supported by grant no. 17-13-01413 “Fundamental Aspects of the Formation of Ultrathin Passivating Films of Organic Compounds on Metals for Protection from Atmospheric Corrosion” from the Russian Science Foundation.
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Goncharova, O.A., Luchkin, A.Y., Andreev, N.N. et al. Chamber Protection of Copper from Atmospheric Corrosion by Compounds of the Triazole Class. Prot Met Phys Chem Surf 56, 1276–1284 (2020). https://doi.org/10.1134/S2070205120070072
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DOI: https://doi.org/10.1134/S2070205120070072