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Effect of electrolysis regimes on the structure and properties of coatings on aluminum alloys formed by anode­cathode micro arc oxidation

机译：电解制度对Anodecathode微弧氧化形成铝合金涂层结构和性能的影响

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The study provides research findings on the effect of current regimes in microplasma oxidation on the phase composition and the properties of oxide coatings on an aluminum alloy. To obtain oxide coatings, micro arc (microplasma) oxidation is carried out in an alkaline-silicate electrolyte with an alternating sinusoidal current and in a pulsed current mode. It has been shown that an increased density of microdischarges in the case of the pulse technology increases the total energy released in them. This produces an increase in the growth rate of the oxide coating and the probability of formation of the α-Al2O3 phase. A linear dependence of the thickness of the coating on the duration of the process time and, accordingly, on the amount of transmitted electricity has been established. It has been found that for a small thickness of the oxide layer, the high rate of heat transfer both to the metal and to the electrolyte promotes the formation of aluminum oxide in the form of the γ-Al2O3 phase. The energy concentration in a thick oxide layer causes the formation of a high-temperature modification of α-Al2O3. It has been shown that the mechanism for the formation of α-Al2O3 is determined by the action of two facts: the difference in the energies of the γ-Al2O3 and α-Al2O3 phases as well as the polymorphic high-temperature transformation of γ-Al2O3→α-Al2O3 in the high-temperature region of a micro arc discharge.The coatings obtained by microplasma oxidation in the pulsed current mode have high hardness (23 GPa) and electrical strength (20 V/μm)
机译：该研究提供了关于电流制度在铝合金上氧化相对相的影响的研究发现及氧化物涂料的性质。为了获得氧化物涂层，微弧（导管）氧化在具有交替正弦电流和脉冲电流模式的碱性硅酸盐电解质中进行。已经表明，在脉冲技术的情况下，微水稻的密度增加增加了它们的总能量。这产生了氧化物涂层的生长速率和α-Al2O3相的概率的增加。建立了在处理时间的持续时间内的涂层厚度的线性依赖性，因此已经建立了透射电量。已经发现，对于氧化物层的小厚度，对金属和电解质的高热量传递速率促进了γ-Al2O3相的形式的氧化铝的形成。厚氧化物层中的能量浓度导致形成α-Al2O3的高温修饰。已经表明，形成α-Al2O3的机制由两个事实的作用决定：γ-Al2O3和α-Al2O3相的能量差异以及γ-的多态性高温变换在微电弧放电的高温区域中的Al2O3→α-Al2O3。通过脉冲电流模式的显微氧化获得的涂层具有高硬度（23GPa）和电力强度（20V /μm）

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