Adsorption and passivation behavior of copper alloy by phthalocyanine complexes in an aqueous chloride solution
https://doi.org/10.61852/2949-3412-2023-1-4-89-100
Abstract
The adsorption and protective properties of teraphthal, the sodium salt of 4.5-octacarboxyphthalocyanine, on the surface of the copper alloy MNZh5-1 in a neutral borate buffer solution were studied. Teraphthal suppresses active anodic dissolution of the MNZh5-1 alloy in 0.01 M chloride buffer pH 7.40. The protective effect increases at Сinh = 1.2 µmol/l from 0.18 V to 0.35 V at 25 µmol/l. The adsorption energy (-Δ𝐺0𝑎,𝑚𝑎𝑥) of teraphthal on the surface of the MNZh5-1 alloy at E = 0.0 V is 78.8 kJ/mol. This value indicates chemisorption of the inhibitor on the electrode surface, which occurs due to the oxygen atoms of carboxyl groups. The thickness of the adsorbed layer, determined by ellipsometry methods, is ≈ 0.3 nm, which indicates a flat arrangement of teraphthal on the surface.
About the Authors
N. P. Andreeva
Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences
Russian Federation
Russian Federation
119071
Leninsky prospect, 31, bldg. 4
Moscow
M. O. Agafonkina
Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences
Russian Federation
Russian Federation
119071
Leninsky prospect, 31, bldg. 4
Moscow
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For citations:
Andreeva N.P., Agafonkina M.O. Adsorption and passivation behavior of copper alloy by phthalocyanine complexes in an aqueous chloride solution. Title in english. 2023;(4):89-100. (In Russ.) https://doi.org/10.61852/2949-3412-2023-1-4-89-100
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