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Effect of spray distance on the microstructure and corrosion resistance of WC - based coatings sprayed by HVOF

Ewa Jonda Leszek Łatka Artur Maciej Marcin Godzierz Klaudiusz Gołombek Andrzej Radziszewski

Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 2 | e144610 | DOI: 10.24425/bpasts.2023.144610

Keywords WC-based powders AZ31 magnesium alloy High Velocity Oxy Fuel microstructure corrosion resistance

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Abstract

Cermet coatings provide protection against aggressive operating environment of machine and device elements, such as corrosion, wear or high-temperature conditions. Currently WC-based cermet coatings are frequently used in the different industry branches. In this work, conventional WC-based powders (WC-Co and WC-Co-Cr) were sprayed with High Velocity Oxy Fuel (HVOF) onto AZ31 magnesium alloy with different spray distances (320 and 400 mm). The aim of the research was to investigate the effect of the spray distance on the microstructure of the coatings, phase composition and electrochemical corrosion resistance. Results revealed that higher spray distance results in greater porosity, 1.9% and 2.3% for 320 mm and 2.8% and 3.1% for 400 mm in case of WC-Co and WC-Co-Cr coatings, respectively. Also the influence has been observed for coatings microhardness, c.a. 1300 HV0.3 for shorter spray distance, whereas for longer one it was less than 1100 HV0.3. The corrosion resistance estimated in potentiodynamic polarization measurements was the best for WC-Co-Cr coating deposited from the shorter spray distance, corrosion current density was equal to 2.9 µA·cm-2 and polarization resistance was equal to 8424 Ω∙cm2.

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Authors and Affiliations

Ewa Jonda

e-mail:

ORCID:

Leszek Łatka

e-mail:

ORCID:

Artur Maciej

Marcin Godzierz

Klaudiusz Gołombek

e-mail:

ORCID:

Andrzej Radziszewski

Silesian University of Technology, Faculty of Mechanical Engineering, Department of Engineering Materials and Biomaterials, ul. Konarskiego 18a, 44-100 Gliwice, Poland
Wroclaw University of Science and Technology, Faculty of Mechanical Engineering, Department of Metal Forming, Welding and Metrology, ul. Łukasiewicza 5, 50-371 Wroclaw, Poland
Silesian University of Technology, Faculty of Chemistry, Department of Inorganic and Analytical Chemistry and Electrochemistry, ul. Krzywoustego 6B, 44-100 Gliwice, Poland
Polish Academy of Sciences, Centre of Polymer and Carbon Materials, ul. M. Curie-Skłodowskiej 34, 41-819 Zabrze, Poland
Silesian University of Technology, Laboratory of the Testy Materials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland
“RESURS” Company, A. Radziszewski, ul. Czarodzieja 12, 03-116 Warszawa, Poland

Effect of TiO₂ on the microstructure and phase composition of Al₂O₃ and Al₂O₃–TiO₂ APS sprayed coatings

Monika Michalak Leszek Łatka Paweł Sokołowski Rolando T. Candidato Jr. Andrzej Ambroziak

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 2 | e136735 | DOI: 10.24425/bpasts.2021.136735

Keywords coating atmospheric plasma spraying Al₂O₃ TiO₂

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Abstract

Plasma sprayed ceramic coatings serve as protective layers and are frequently exposed to aggressive wear, corrosion, or high-temperature environment. Currently, alumina and alumina-titania are some of the most popular protective ceramic composite coatings used in the industry. The present work deals with the investigation of the influence of TiO₂ content in the feedstock powder on the resulting microstructure and properties of Al₂O₃, Al₂O₃ + 3 wt% TiO₂, Al₂O₃ + 13 wt% TiO₂ and Al₂O₃ + 40 wt% TiO₂ coatings developed via atmospheric plasma spraying (APS). Specifically, the phase composition, morphology, and microstructure, as well as the mechanical and tribological performance of the coatings were examined. Results revealed that higher content of TiO₂ induced the transformation of phases, leading to the formation of intermediary Al₂TiO₅ and Al₂- xTi₁- xO₅ phases. Also, the dominant α–Al₂O₃ to γ–Al₂O₃ transformation confirmed the formulation of well-melted lamellas within the coating structure. It was also shown that the increase in TiO₂ content decreased the micro-hardness of the coatings due to the formation of the intermediary phases as mentioned above and thus, affected their tribological performance. The lowest volumetric wear, equal to 7.2×10⁻⁵ mm³/(N ∙ m), was reported for Al₂O₃ + 13 wt% TiO₂ coating.

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Authors and Affiliations

Monika Michalak

e-mail:

ORCID:

Leszek Łatka

e-mail:

ORCID:

Paweł Sokołowski

e-mail:

ORCID:

Rolando T. Candidato Jr.

e-mail:

ORCID:

Andrzej Ambroziak

e-mail:

ORCID:

Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
Physics Department, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, A. Bonifacio Avenue, Tibanga, 9200, Iligan, City, Philippines

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Effect of spray distance on the microstructure and corrosion resistance of WC - based coatings sprayed by HVOF

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Effect of TiO₂ on the microstructure and phase composition of Al₂O₃ and Al₂O₃–TiO₂ APS sprayed coatings

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Authors and Affiliations