Investigation of electrochemical properties of inhibited chromate-free conversion coatings on AMg3 aluminum alloy during exposure in a humidity chamber
https://doi.org/10.61852/2949-3412-2025-3-3-94-105
Abstract
Aluminum alloys of Al-Mg system have a high corrosion resistance, but scientific researches show that they are characterized by pitting corrosion even under atmospheric conditions. Therefore, various coatings for their protection are used, including coatings obtained by chemical oxidation method. In this paper, studies of chromate-free inhibited IFKhANAL-3 conversion coatings were carried out in the G-4 humidity chamber in combination with electrochemical impedance spectroscopy, conductometric analysis and X-ray spectral microanalysis. This made it possible to identify the factors of the beginning of the corrosion process and, in particular, to show the absence of corrosion inhibitor desorption during testing. It was shown that the addition of 1,2,3-benzotriazole into the converting solution contributes to both an increase in the active resistance (Rf) of the oxide film and a later appearance of the first corrosion damage on the coating in comparison with unmodified coatings. According to the conductometric analysis data, it has been shown that a decrease in the porosity of the coatings is observed during the G-4 humidity chamber tests.
About the Authors
Yu. A. Kuzenkov
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences
Russian Federation
Russian Federation
D. O. Chugunov
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences
Russian Federation
Russian Federation
N. G. Anufriev
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences
Russian Federation
Russian Federation
S. Yu. Rybakov
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences
Russian Federation
Russian Federation
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Review
For citations:
Kuzenkov Yu.A., Chugunov D.O., Anufriev N.G., Rybakov S.Yu. Investigation of electrochemical properties of inhibited chromate-free conversion coatings on AMg3 aluminum alloy during exposure in a humidity chamber. Title in english. 2025;(3):94-105. (In Russ.) https://doi.org/10.61852/2949-3412-2025-3-3-94-105
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