Research of the mechanism of formation and properties of tripolyphosphate coating on the steel basis

Authors

  • Elena Vlasova SHEI «National Metallurgical Academy of Ukraine» Gagarina ave., 8, Dnepr, Ukraine, 49005, Ukraine https://orcid.org/0000-0002-6814-409X
  • Vadym Кovalenko SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnepr, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-8012-6732
  • Valerii Kotok SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnepr, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0001-8879-7189
  • Sergey Vlasov SHEI «National Mining University» Yavornitsky ave., 19, Dnepr, Ukraine, 49600 FSBEI HE «Vyatka State University» Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-5537-6342

DOI:

https://doi.org/10.15587/1729-4061.2016.79559

Keywords:

sodium tripolyphosphate, anodic curve, passivation coat, protective properties, formation mechanism

Abstract

The mechanism, protective properties, microstructure, phase composition of coats on steel have been investigated. According to the developed method, the coats were deposited potentiodynamically and potentiostatically in an aqueous solution of sodium tripolyphosphate. Based on the results of electrochemical studies, it has been established, that on potentiodynamic curves, characterizing the corrosion behavior of low-carbon steel in an aqueous sodium TPP solution, up to three passivation plateaus can be observed. The multi-stage formation mechanism of tripolyphosphate coat has been proposed. The mechanism includes three stages: at the start the adsorptive film is formed, that afterwards is modified two times, accompanied by a change of properties and composition. By using the methods of optical and scanning electron microscopy, X-ray diffraction, it has been established that the coat formed in an aqueous Na TPP solution by the potentiodynamic method under conditions of complete passivation, is composed of two layers: first – thin, compact layer, that contains a crystalline phase of phosphate nature, and second – thick hydrophilic layer, capable of drying. Such coat possesses the best protective properties in 0.1 N Na2SO4 solution, that models conditions of atmospheric corrosion.

The nature of the electrochemical formation mechanism of tripolyphosphate coats and features of their structural and phase composition have been established.

The further studies will be directed at the development of effective deposition methods of tripolyphosphate coats with estimated set of properties for the protection of metal goods from atmospheric and high-temperature gas corrosion.

Author Biographies

Elena Vlasova, SHEI «National Metallurgical Academy of Ukraine» Gagarina ave., 8, Dnepr, Ukraine, 49005

PhD, Associate Professor

Department of coating, composite materials and metal protection from corrosion. 

Vadym Кovalenko, SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnepr, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Analytical Chemistry and Food Additives and Cosmetics

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing

Valerii Kotok, SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnepr, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing

Sergey Vlasov, SHEI «National Mining University» Yavornitsky ave., 19, Dnepr, Ukraine, 49600 FSBEI HE «Vyatka State University» Moskovskaya str., 36, Kirov, Russian Federation, 610000

Doctor of technical science, Professor

Department of underground mining

Doctor of technical science, Professor

Department of building manufacture

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Published

2016-10-30

How to Cite

Vlasova, E., Кovalenko V., Kotok, V., & Vlasov, S. (2016). Research of the mechanism of formation and properties of tripolyphosphate coating on the steel basis. Eastern-European Journal of Enterprise Technologies, 5(5 (83), 33–39. https://doi.org/10.15587/1729-4061.2016.79559

Issue

Vol. 5 No. 5 (83) (2016): Applied physics. Materials Science

Section

Materials Science

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Copyright (c) 2016 Elena Vlasova, Vadym Кovalenko, Valerii Kotok, Sergey Vlasov

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