Investigation of physical and chemical properties and structure of tripolyphosphate coatings on zinc plated steel

Authors

  • Olena Vlasova National Metallurgical Academy of Ukraine Gagarina ave., 8, Dnipro, Ukraine, 49005, Ukraine https://orcid.org/0000-0002-6814-409X
  • Vadym Kovalenko Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-8012-6732
  • Valerii Kotok Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0001-8879-7189
  • Sergey Vlasov National Mining University V. Yavornitsky ave., 19, Dnipro, Ukraine, 49600 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-5537-6342
  • Anna Cheremysinova Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005, Ukraine https://orcid.org/0000-0002-7877-1257

DOI:

https://doi.org/10.15587/1729-4061.2017.103151

Keywords:

composition, coat structure, zinc-plated steel, protective properties, sodium tripolyphosphate, aqueous solution

Abstract

The results of complex studies on the influence of the concentration of aqueous sodium tripolyphosphate solution on the physicochemical properties and structure of the coats on zinc-plated steel are presented. The coats were chemically deposited from 2–14 % aqueous sodium tripolyphosphate (STPP) solutions, heated to 70 ºС. It has been established that increasing concentration of aqueous STPP solution leads to an increase of the specific mass and crystallinity of the coats and decrease of protective properties. Metallographic studies have shown that the amorphous structure of the coats deposited from 2 % aqueous STPP solution changes to a structure with large sizes of crystallites for the coats prepared from aqueous STPP solutions with higher concentrations. The results of the X-ray diffraction (XRD) analysis have revealed that the coats with low protective properties, in addition to anhydrous zinc phosphates, also contain hydrated species. By means of raster electron microscopy, it has been established that the coats with the lowest protective properties, prepared from 12–14 % aqueous STPP solutions, are formed as thick, spongy layers with the presence of microcracks. Such structure leads to the accumulation and containment of moisture, which promotes corrosion under atmospheric conditions. 

Author Biographies

Olena Vlasova, National Metallurgical Academy of Ukraine Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of coating, composite materials and metal protection from corrosion

Vadym Kovalenko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 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, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 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, National Mining University V. Yavornitsky ave., 19, Dnipro, Ukraine, 49600 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000

Doctor of Technical Sciences, Professor

Department of underground mining

Department of building manufacture

Anna Cheremysinova, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

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Published

2017-06-19

How to Cite

Vlasova, O., Kovalenko, V., Kotok, V., Vlasov, S., & Cheremysinova, A. (2017). Investigation of physical and chemical properties and structure of tripolyphosphate coatings on zinc plated steel. Eastern-European Journal of Enterprise Technologies, 3(12 (87), 4–8. https://doi.org/10.15587/1729-4061.2017.103151

Issue

Vol. 3 No. 12 (87) (2017): Materials Science

Section

Materials Science

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Copyright (c) 2017 Olena Vlasova, Vadym Kovalenko, Valerii Kotok, Sergey Vlasov, Anna Cheremysinova

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