Effect of electrolysis regimes on the structure and properties of coatings on aluminum alloys formed by anodecathode micro arc oxidation
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 1, Issue 12
Abstract
<p>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-Al<sub>2</sub>O<sub>3</sub> 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-Al<sub>2</sub>O<sub>3</sub> phase. The energy concentration in a thick oxide layer causes the formation of a high-temperature modification of α-Al<sub>2</sub>O<sub>3</sub>. It has been shown that the mechanism for the formation of α-Al<sub>2</sub>O<sub>3 </sub>is determined by the action of two facts: the difference in the energies of the γ-Al<sub>2</sub>O<sub>3</sub> and α-Al<sub>2</sub>O<sub>3</sub> phases as well as the polymorphic high-temperature transformation of γ-Al<sub>2</sub>O<sub>3</sub>→α-Al<sub>2</sub>O<sub>3</sub> in the high-temperature region of a micro arc discharge.</p>The coatings obtained by microplasma oxidation in the pulsed current mode have high hardness (23 GPa) and electrical strength (20 V/μm)
Authors and Affiliations
Valery Belozerov, Oleg Sоbоl, Anna Mahatilova, Valeria Subbotinа, Taha A. Tabaza, Ubeidulla F. Al-Qawabeha, Safwan M. Al-Qawabah
Keywords
Related Articles
- EP ID EP527837
- DOI 10.15587/1729-4061.2018.121744
- Views 85
- Downloads 0
Determining the electromagnetic field parameters to kill flies at livestock facilities
<p>We have considered the electromagnetic method to kill the larvae of flies ‒ agricultural pests. To address the task, a problem on the distribution of electromagnetic fields in their body was solved. The solution is ba...
Determining the dynamic loading on an open-top wagon with a two-pipe girder beam
<p>To ensure the structural strength of open-top wagons, it has been proposed to introduce the concept of a traction device that could be implemented in open-top wagons with bearing elements made of round pipes. Feature...
The use of heat circulator for flammability in mesoscale combustor
<p>The mesoscale combustor is a part of the micropower electric generator. The function of the mesoscale combustor is to convert hydrocarbon to become thermal energy through combustion reaction. It is difficult to mainta...
Development of an intelligent agent for analysis of nonfunctional characteristics in specifications of software requirements
<p>One of the urgent present-day tasks consists in ensuring an automated analysis of specifications of software requirements for sufficiency of information on nonfunctional component characteristics of software quality....
Analysis of the effect of ultraviolet irradiation on varroa mite
<p>We presented theoretical and experimental material on the influence of UV irradiation on a Varroa mite in the range of UVB and UVC in the study. We obtained mathematical expressions that simulate dependencies of elect...