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Abstract

Plasma oxidation, similarly to anodic oxidation (anodizing), are classified as electrochemical surface treatment of metals such as Al, Mg, Ti and their alloys. This type of treatment is used to make surface of castings, plastically processed products, shaped with incremental methods to suitable for certain requirements. The most important role of the micro plasma coating is to protect the metal surface against corrosion. It is well known that coating of aluminium alloys containing silicon using anodic oxidation causes significant difficulties. They are linked to the eutectic nature of this alloy and result in a lack of coverage in silicon-related areas. The coating structure in these areas is discontinuous. In order to eliminate this phenomenon, it is required to apply oxidation coatings using the PEO (Plasma Electrolytic Oxidation) method. It allows a consistent, crystalline coating to be formed. This study presents the mechanical properties of the coatings applied to Al-Si alloy using the PEO method. As part of the testing, the coating thickness, microhardness and scratch resistance were determined. On the basis of the results obtained, it was concluded that the thickness of the coatings complies with the requirements of conventional anodizing. Additionally, microhardness values exceeded the results obtained with standard methods.
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Bibliography

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Authors and Affiliations

P. Długosz
1
ORCID: ORCID
A. Garbacz-Klempka
2
ORCID: ORCID
J. Piwowońska
1
P. Darłak
3
ORCID: ORCID
M. Młynarczyk
3

  1. Lukasiewicz Research Network - Krakow Institute of Technology, 73 Zakopiańska Str. 30-418 Cracow, Poland
  2. AGH University of Science and Technology, Faculty of Foundry Engineering, Reymonta 23 Str., 30-059 Kraków, Poland
  3. AGH University of Science and Technology, Faculty of Foundry Engineering, 23 Reymonta Str., 30-059 Kraków, Poland
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Abstract

Currently, due to the economic and ecological aspects, light alloys are increasingly important construction material, in particular in the transport industry. One of the popular foundry magnesium alloys is the alloy AZ91, which among others due to mechanical properties and technological features, is used, for example, for light structural parts.
The paper presents the results of research on modification of the AZ91 alloy surface layer in the plasma electrolytic oxidation process. The change of usable properties of the produced coatings was obtained by introducing additions of silicon carbide or boron nitride. The thickness and hardness of the protective layers produced, resistance to scratches and corrosion resistance were determined. Moreover, the friction coefficient of the coating-steel pair was investigated. The quality of the connections made between the coating and the substrate, i.e. the magnesium alloy, was also evaluated. The results obtained for coatings with silicon carbide or boron nitride additives were always compared to the results obtained for unmodified samples.
On the basis of the obtained results, it was shown that the introduction of boron nitride additive to the AZ91 alloy coating produced in the plasma electrolytic oxidation process significantly improves the resistance to: (i) corrosion and (ii) abrasive wear of the coating.
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Authors and Affiliations

D. Pelczar
1
P. Długosz
2
ORCID: ORCID
P. Darłak
2
ORCID: ORCID
A. Szewczyk-Nykiel
1
ORCID: ORCID
M. Nykiel
1
ORCID: ORCID
M. Hebda
1
ORCID: ORCID

  1. Cracow University of Technology, Faculty of Materials Engineering and Physics, Department of Materials Engineering, 24 Warszawska St r., 31-155 Krakow, Poland
  2. Centre of Casting Technology, Research Network Lukasiewicz-Krakow Institute of Technology, Zakopiańska 73, 30-418 Krakow, Poland

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