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:
20 views / 4 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
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