Features of Coating Formation by Micro-Arc Oxidation on High-Silicon Aluminum Alloy.

Autor: Dudareva, N. Yu., Gallyamova, R. F., Deev, V. B., Kolomeichenko, A. V.
Zdroj: Journal of Surface Investigation: X-Ray, Synchrotron & Neutron Techniques; Dec2022, Vol. 16 Issue 6, p1301-1307, 7p
Abstrakt: The features of coating formation by micro-arc oxidation (MAO) on an aluminum alloy with a high content of silicon (>20 wt %) are studied. The processing of high-silicon aluminum alloys by the MAO method is very difficult, since the MAO process is unstable, and the coating is nonuniform and small in thickness. The hypothesis of this work suggests that a high-quality thick MAO coating on high-silicon aluminum alloys is formed at a high density of the anode current. We demonstrate the influence of electrical modes of the MAO process on the properties of coatings formed on an M244 aluminum alloy containing 23–26 wt % Si. The samples were processed using four modes with different densities of the anode current. The thickness, microhardness, and porosity of the coatings are studied. It is found that with an increase in the anode current density, the thickness of the MAO coating increases. The maximum thickness of the MAO coating is ~135 μm. An increase in the anode current density of more than 13 A/dm2 does not affect the MAO-coating thickness. It is found that the growth rate of the MAO coating varies in proportion to the anode current density. However, the microhardness and porosity of MAO coatings on all samples are independent of the current density. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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