Study of the anticorrosion effect of polymer phosphates on steel at elevated temperatures

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.118346

Keywords:

sodium metaphosphate, sodium tripolyphosphate, mixed polyphosphates, an anticorrosive effect, scale

Abstract

Technological greases based on polyphosphates of alkali metals have great prospects for application at high-temperature machining of steel. An important task is to study the anti-corrosive effect of polyphosphates on steel at elevated temperatures. Temperature ranges, in which phase transformations of metaphosphate and sodium tripolyphosphate, as well as interaction with iron oxide, occur, were established using a thermogravimetric method. Composition of products of interaction between metaphosphate and sodium tripolyphosphate and scale is determined employing an X-ray phase analysis. It was established that in the region of temperatures of hot steel deformation the iron oxides, contained in scale, are dissolved in molten metaphosphate and sodium tripolyphosphate. As a result of interaction between sodium metaphosphate and iron oxide, the mixed polyphosphates Na3Fe2(PO4)3 and Na9Fe2(P3O10)3 are formed. It is shown that sodium tripolyphosphate almost does not participate in the interaction with the iron oxide of scale. Comparison of the results of corrosion test of the steel surface, treated in the presence of a polyphosphate lubrication and sodium chloride, testifies to the high anti-corrosive effect of polyphosphates. Thus, the time before the emergence of first signs of corrosion in the presence of polyphosphates increased fourfold, while the degree of corrosion damage was reduced by 40 times. It was established that at the deformation treatment of steel at a temperature of 800 °C in the presence of a polyphosphate lubricant, corrosion resistance is due to the formation of a barrier film at the steel surface, consisting of mixed polymer phosphates.

Author Biographies

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

Irina Sknar, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processes, Devices and General Chemical Technology

Kateryna Plyasovskaya, Оles Honchar Dnipro National University Gagarina ave., 72, Dnipro, Ukraine, 49010

PhD, Associate Professor

Department of Physical and Inorganic Chemistry

Olga Sverdlikovska, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processing polymers and photo-, nano -, and polygraphic materials

Oleksii Sigunov, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Chemical Technology of Astringent Materials

Oksana Demchyshyna, Kryvyi Rih National University Vitaliya Matusevycha str., 11, Kryvyi Rih, Ukraine, 50027

PhD, Assistant

Department of mineral processing and chemistry

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Published

2017-12-13

How to Cite

Cheremysinova, A., Sknar, I., Plyasovskaya, K., Sverdlikovska, O., Sigunov, O., & Demchyshyna, O. (2017). Study of the anticorrosion effect of polymer phosphates on steel at elevated temperatures. Eastern-European Journal of Enterprise Technologies, 6(12 (90), 52–57. https://doi.org/10.15587/1729-4061.2017.118346

Issue

Vol. 6 No. 12 (90) (2017): Materials Science

Section

Materials Science

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Copyright (c) 2017 Anna Cheremysinova, Irina Sknar, Kateryna Plyasovskaya, Olga Sverdlikovska, Oleksii Sigunov, Oksana Demchyshyna

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