Funct. Mater. 2022; 29 (3): 456-461.
Influence of electrical parameters of the micro-arc oxidation mode on the structure and properties of coatings
National Technical University "Kharkov Polytechnical Institute", 2 Kyrpychova Str., 61002 Kharkiv, Ukraine
The influence of different power sources of the micro-arc oxidation process on the peculiarities of structure formation and properties of coatings on aluminum alloy AB formed in alkali-silicate electrolyte in the anode-cathode mode is investigated. It is shown that the pulse technology and the anode-cathode mode make it possible to form coatings containing mainly oxides of the α-Al2O3 type (corundum) with a high growth rate. It has been established that with a small thickness of the oxide layer, the rate of heat removal both to the metal and to the electrolyte is high; this fact promotes the formation of alumina in the form of the γ-Al2O3 phase. The energy concentration in the thick oxidizing layer causes the formation of high-temperature modification of α-Al2O3. It is shown that the mechanism of α-Al2O3 formation is determined by two factors: the energy difference in the formation of γ-Al2O3 and α-Al2O3 phases, and the polymorphic high-temperature transformation of γ-Al2O3→α-Al2O3 in the high-temperature region of the arc discharge.
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