Investigation of composition and structure of tripoliphosphate coating on low carbon steel

Authors

  • Elena Vlasova SHEI «National Metallurgical Academy of Ukraine» Gagarina ave., 8, Dnipro, Ukraine, 49600, Ukraine https://orcid.org/0000-0002-6814-409X
  • Vadym Kovalenko SHEI «Ukrainian State University of Chemical Technology» Gagarina ave., 8, Dnipro, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovska 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, Dnipro, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovska str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0001-8879-7189
  • Sergey Vlasov SHEI «National Mining University» Yavornytskoho ave., 19, Dnipro, Ukraine, 49600 FSBEI HE «Vyatka State University» Moskovska str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-5537-6342
  • Irina Sknar SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnipro, Ukraine, 49005, Ukraine https://orcid.org/0000-0001-8433-1285
  • Anna Cheremysinova SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnipro, Ukraine, 49005, Ukraine https://orcid.org/0000-0002-7877-1257

DOI:

https://doi.org/10.15587/1729-4061.2017.96572

Keywords:

sodium tripolyphosphate, iron (III) tripolyphosphate, precipitate, coating, protective properties, matrix structure, chemical synthesis

Abstract

The hypothesis on the matrix (composite) structure of the iron (III) tripolyphosphate precipitate and polyphosphate coatings on the steel substrate has been justified experimentally. According to the hypothesis, that iron (III) tripolyphosphate acts as a matrix forming agent while water-soluble sodium tripolyphosphate corrosion inhibitor is a filler.

Be means of the chemical synthesis method, it has been demonstrated that the chemical basis of the coating formed on the steel surface in the STPP solution is iron (III) tripolyphosphate.

It has been established that the composite structure of tripolyphosphate coatings and precipitates is determined by the nature of iron (III) tripolyphosphate.

The conducted investigation on the composition of the iron (III) tripolyphosphate precipitate and tripolyphosphate coating on steel, using the gravimetric method with washing have proved the presence of STPP. The results of X-ray spectral analysis have revealed that STPP in the structure of composite coating is situated not only as a filler inside the matrix but also as an additional layer on its surface.

The chemical protection mechanism of the tripolyphosphate coating on steel in atmospheric conditions has been justified.

The acquired knowledge would expand the theoretical and practical concept of the structure and properties of tripolyphosphate coatings on the steel substrate and their protection mechanism in conditions of atmospheric corrosion. The application of new knowledge in researches aimed at the development of ecologically safe methods of tripolyphosphate coating deposition with estimated complex of properties, would increase their efficiency.

Author Biographies

Elena Vlasova, SHEI «National Metallurgical Academy of Ukraine» Gagarina ave., 8, Dnipro, Ukraine, 49600

PhD, Associate Professor

Department of coating, composite materials and metal protection from corrosion

Vadym Kovalenko, SHEI «Ukrainian State University of Chemical Technology» Gagarina ave., 8, Dnipro, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovska 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, Dnipro, Ukraine, 49005 FSBEI HE «Vyatka State University» Moskovska 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» Yavornytskoho ave., 19, Dnipro, Ukraine, 49600 FSBEI HE «Vyatka State University» Moskovska str., 36, Kirov, Russian Federation, 610000

Doctor of Technical Science, Professor

Department of underground mining

Department of building manufacture

Irina Sknar, SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processes, Devices and General Chemical Technology

Anna Cheremysinova, SHEI «Ukrainian State University of Chemical Technology» Gagarin ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

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Published

2017-04-25

How to Cite

Vlasova, E., Kovalenko, V., Kotok, V., Vlasov, S., Sknar, I., & Cheremysinova, A. (2017). Investigation of composition and structure of tripoliphosphate coating on low carbon steel. Eastern-European Journal of Enterprise Technologies, 2(6 (86), 4–10. https://doi.org/10.15587/1729-4061.2017.96572

Issue

Vol. 2 No. 6 (86) (2017): Technology organic and inorganic substances. Ecology

Section

Technology organic and inorganic substances

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Copyright (c) 2017 Elena Vlasova, Vadym Kovalenko, Valerii Kotok, Sergey Vlasov, Irina Sknar, Anna Cheremysinova

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