COMBINED COATINGS AGAINST MECHANICAL WEAR AND CORROSION LOW CARBON STEEL

1 BROŽEK Vlastimil
Co-authors:
2 POKORNÝ Petr 2 KOLÍSKO Jiří 2 VOKÁČ Miroslav 3 MASTNÝ Libor 3 STOULIL Jan
Institutions:
1 Institute of Plasma Physics CAS v.v.i. Prague, Czech Republic, EU, brozek@ipp.cas.cz
2 Klokner Institute Prague, Czech Republic, EU, petr.pokorny@cvut.cz
3 University of Chemistry and Technology Prague, Czech Republic, EU, libor.mastny@vscht.cz
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1194-1199
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
50 views / 17 downloads
Abstract

In this study, special ceramic coatings were prepared on low carbon steel (1.0060 – EN 10027-2) via the plasma spraying technique using a WSP®-H plasma generator with output of up to 40 kg/h of aluminum oxide. Corundum coatings were deposited directly on the surface of steel plungers equipped with an anti-corrosion interlayer of zinc phosphate. Coating adhesion properties were tested using pin-off tests (modified ISO 4624) and reached a maximum value of 26 MPa. Corrosion resistance was evaluated by measurements of impedance spectra in the 100 kHz – 10 mHz range in a water solution of sodium sulfate. The capacity of electric double-layer varied depending on the porosity and thickness of the coating. Low-porosity coatings of >1.5 mm thickness had RCT 1.29·105 Ω·m2. The abrasive resistance of coatings was measured by rotary/machining test with SiC cutting knives, using a downforce of 50 kg·cm-2. Abrasion losses decreased with the quality of finish – starting at 0.00266 g cm-2 min-1 down to virtually zero losses after polishing the surface below Ra = 0.55 µm.

Keywords: Plasma spraying, steel phosphating, ceramic coatings, corrosion resistance, abrasion

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Scroll to Top