Effect of azole group inhibitors on the anticorrosion efficiency of coatings formed on aluminum alloy

Authors

  • Andrey S. Gnedenkov Institute of Chemistry, FEB RAS, Vladivostok, Russia
  • Yana I. Kononenko Institute of Chemistry, FEB RAS, Vladivostok, Russia
  • Sergey L. Sinebryukhov Institute of Chemistry, FEB RAS, Vladivostok, Russia
  • Valeriya S. Filonina Institute of Chemistry, FEB RAS, Vladivostok, Russia
  • Igor E. Vyaliy Institute of Chemistry, FEB RAS, Vladivostok, Russia
  • Sergey V. Gnedenkov Institute of Chemistry, FEB RAS, Vladivostok, Russia

Keywords:

composite protective coatings, aluminum alloy, plasma electrolytic oxidation, corrosion inhibitors, azoles, electrochemical impedance spectroscopy

Abstract

As a result of this work, it was found that composite coatings formed by plasma electrolytic oxidation (PEO) and impregnated with corrosion inhibitors of the azole group (in concentration of 0.05 M and 0.1 M) significantly improve the corrosion performance of the AlMg3 aluminum alloy. In order to reveal the dependence of the protective properties of coatings on concentration of incorporated inhibitors, the morphological and electrochemical properties of composite coatings were studied. Using the methods of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) it was found that the PEO-coating composed of aluminium oxide is characterized by a self-organized microtubular structure (with microtube diameter varying from 300 to 500 nm, and a tube height of 9–10 μm). The study of anticorrosion characteristics of coatings by electrochemical impedance spectroscopy (EIS) showed that all samples with coatings showed better anticorrosion properties, in comparison with bare aluminum alloy. Increase in the concentration of corrosion inhibitors up to 0.1 M results in decrease of the protective properties of such coatings, which may be due to the formation of compounds with a higher solubility compared to the PEO-layer.

Author Biographies

Andrey S. Gnedenkov, Institute of Chemistry, FEB RAS, Vladivostok, Russia

Professor of RAS, Doctor of Sciences in Chemistry Leading Researcher

http://orcid.org/0000-0002-9822-7849

Yana I. Kononenko, Institute of Chemistry, FEB RAS, Vladivostok, Russia

Junior Researcher, Postgraduate student 

 http://orcid.org/0000-0002-2299-9009

Sergey L. Sinebryukhov, Institute of Chemistry, FEB RAS, Vladivostok, Russia

Corresponding Member of RAS, Doctor of Sciences in Chemistry,

Associate Professor, Deputy Director

http://orcid.org/0000-0002-0963-0557

Valeriya S. Filonina, Institute of Chemistry, FEB RAS, Vladivostok, Russia

Junior Researcher, Postgraduate student

http://orcid.org/0000-0002-9544-3597

Igor E. Vyaliy, Institute of Chemistry, FEB RAS, Vladivostok, Russia

Candidate of Sciences in Chemistry, Researcher

http://orcid.org/0000-0003-3806-1709

Sergey V. Gnedenkov, Institute of Chemistry, FEB RAS, Vladivostok, Russia

Corresponding Member of RAS, Doctor of Sciences in Chemistry, Professor, Director 

http://orcid.org/0000-0003-1576-8680

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Published

2022-12-07

How to Cite

Gnedenkov А. С., Kononenko Я. И., Sinebryukhov С. Л., Filonina В. С., Vyaliy И. Е., & Gnedenkov С. В. (2022). Effect of azole group inhibitors on the anticorrosion efficiency of coatings formed on aluminum alloy. Vestnik of the Far East Branch of the Russian Academy of Sciences, (6), 57–65. Retrieved from http://vestnikdvo.ru/index.php/vestnikdvo/article/view/1021

Issue

No. 6 (2022)

Section

Physicochemistry of surface and nanosized systems