Abstract
The properties of coatings formed on the MA8 magnesium alloy by the plasma electrolytic oxidation in electrolytes containing silicon carbide nanoparticles in concentrations of 2, 4 and 6 g/l have been investigated. It has been shown that coatings, which contain nanoparticles, have a significant advantage in microhardenss and adhesive strength in comparison with the surface layers obtained without their use.
Highlights
Magnesium alloys inspire a high interest due to such physical-mechanical properties of these materials as low density (1.35–1.85 g cm−3); high specific strength, stiffness, thermal conductivity and heat capacity; the ability to absorb the impact energy and reduce vibration
Influence of the electrolyte composition on the mode of plasma electrolytic oxidation is presented as a dependence of the current density and voltage on the PEO process time (Fig. 1)
This behavior can be explained by an increase in the https://doi.org/10.10 51/matecconf /202134602021 heterogeneity of the coating, which leads to an increase in conductivity and, as a consequence, to an increase in the current density
Summary
Magnesium alloys inspire a high interest due to such physical-mechanical properties of these materials as low density (1.35–1.85 g cm−3); high specific strength, stiffness, thermal conductivity and heat capacity; the ability to absorb the impact energy and reduce vibration. Note that major disadvantages of magnesium alloys can be eliminated by plasma electrolytic oxidation (PEO) This method allows obtaining protective coatings on different metals and alloys without thorough surface preparation before forming corrosion protective, wearproof PEO-layers with high adhesion to the substrate [1,2,3]. One of the directions of PEO’s development involves the use of nanoscale materials that have certain physicochemical properties in the electrolyte These properties allows improving the performance characteristics of the surface layers and expand the area of practical usage of coated samples [4,5,6,7,8]. Advantages of silicon carbide have been proved in various industrial areas due to its high hardness, durability and chemical resistivity It is actively used for formation abrasive materials, composites, and cutting equipment [9,10]. This paper is devoted to the study of the mechanical properties of PEO layers formed on the MA8 magnesium alloy in silicate-fluoride electrolyte with the addition of SiC nanoparticles
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