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Abstract

Magnesium-based alloys are widely used in the construction, automotive, aviation and medical industries. There are many parameters that can be modified during their synthesis in order to obtain an alloy with the desired microstructure and advantageous properties. Modifications to the chemical composition and parameters of the synthesis process are of key importance. In this work, an Mg-based alloy with a rare-earth element addition was synthesized by means of mechanical alloying (MA). The aim of this work was to study the effect of milling times on the Mg-based alloy with a rare-earth addition on its structure and microhardness. A powder mixture of pure elements was milled in a SPEX 8000D high energy shaker ball mill under an argon atmosphere using a stainless steel container and balls. The sample was mechanically alloyed at the following milling times: 3, 5, 8 and 13 h, with 0.5 h interruptions. The microstructure and hardness of samples were investigated. The Mg-based powder alloy was examined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and using a Vickers microhardness test. The results showed that microhardness of the sample milled for 13 h was higher than that of those with milling time of 3, 5 and 8 h.
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Authors and Affiliations

Sabina Lesz
1
ORCID: ORCID
Bartłomiej Hrapkowicz
1
ORCID: ORCID
Klaudiusz Gołombek
1
ORCID: ORCID
Małgorzata Karolus
2
ORCID: ORCID
Patrycja Janiak
1

  1. Department of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18A, 44-100, Gliwice, Poland
  2. Institute of Materials Engineering, University of Silesia, ul. 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
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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
1
ORCID: ORCID
Leszek Łatka
2
ORCID: ORCID
Artur Maciej
3
Marcin Godzierz
4
Klaudiusz Gołombek
5
ORCID: ORCID
Andrzej Radziszewski
6

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

In order to investigate the effect of the milling time on the corrosion resistance of the Mg65Zn30Ca4Pr1 alloy, powders of the alloy were prepared and milled for 13, 20, and 70 hours, respectively. The samples were sintered using spark plasma sintering (SPS) technology at 350◦C and pressure of 50 MPa. The samples were subjected to potentiodynamic immersion tests in Ringer’s solution at 37◦C. The obtained values of Ecorr were –1.36, –1.35, and –1.39 V, with polarization resistance Rp = 144, 189, and 101 Ω for samples milled for 13, 20 and 70 h, respectively. The samples morphology showed cracks and pits, thus signaling pitting corrosion.
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Authors and Affiliations

Bartłomiej Hrapkowicz
1
ORCID: ORCID
Sabina Lesz
1
ORCID: ORCID
Aleksandra Drygała
1
ORCID: ORCID
Małgorzata Karolus
2
ORCID: ORCID
Klaudiusz Gołombek
3
ORCID: ORCID
Rafał Babilas
1
ORCID: ORCID
Julia Popis
1
ORCID: ORCID
Adrian Gabryś
1
ORCID: ORCID
Katarzyna Młynarek-Żak
1
ORCID: ORCID
Dariusz Garbiec
4

  1. Department of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18A, 44-100 Gliwice, Poland
  2. Institute of Materials Engineering, University of Silesia, ul. Pułku Piechoty 75 1a, 41-500 Chorzow, Poland
  3. Materials Research Laboratory, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland
  4. Łukasiewicz Research Network – Poznan Institute of Technology, ul. Ewarysta Estkowskiego 6, 61-755 Poznan, Poland

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