The influence of the conditions of microplasma processing (microarc oxidation in anode­cathode regime) of aluminum alloys on their phase composition

Belozerov, Valery; Sоbоl, O. V.; Mahatilova, Anna; Subbotinа, Valeria; Tabaza, Taha A.; Al-Qawabeha, Ubeidulla F.; Al-Qawabah, Safwan M.

doi:10.15587/1729-4061.2017.112065

Cited by 10 publications

(19 citation statements)

References 29 publications

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“…Therefore, to achieve high hardness and wear resistance of MAO coatings on aluminum alloys, it is necessary to provide a large percentage of the a-A1 2 O 3 (corundum) phase. Moreover, as was established in [31,35], phase formation during the MAO treatment of aluminum alloys in the microarc discharge mode begins with the γ-А1 2 О 3 phase, which undergoes the γ→a transition as the coating forms.…”

Section: Literature Review and Problem Statementmentioning

confidence: 77%

“…The latter was determined by an increase in luminosity. It is known that the properties of MAO coatings (base layer) are primarily determined by their phase composition [31,35].…”

Section: Results Of the Study Of The Influence Of Mao Treatment Regimmentioning

confidence: 99%

“…The presence of direct contact between the metal and the breakdown region allows expecting a large effect of the chemical composition of the aluminum alloy on the properties of coatings [45]. Preliminary studies have shown that the phase composition of coatings on different grades of aluminum alloys is different, which is apparently due to the partial completion of the transformation of the low-temperature modification of γ-A1 2 O 3 alumina into the stable modification a-A1 2 O 3 [31,35].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…This is due to the fact that industrial alloys with multi-element alloying are mainly studied, which makes it practically impossible to establish the laws of the influence of elemental composition on the mechanism and kinetics of structural transformations. Since the influence of different elements (making up the alloy) can have not only different kinetics, but also lead to opposite effects (as assumed, for example, from the results of [31]). Because of this, there are currently insufficient data to understand the nature of the influence of the chemical composition of the aluminum alloy and electrolysis conditions (in particular, electrolyte composition) on the mechanism and kinetics of both the main γ→a transformation and other types of transformations.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…These microdischarges have a thermal and plasmochemical effect on the coating itself and electrolyte [28,29]. As a result, the hardness and strength of materials increase [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Subbotinа¹,

Al-Qawabeha²,

Belozerov³

et al. 2019

EEJET

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Методом мікродугового оксидування технічно чистого алюмінію і алюмінію легованого міддю і цинком в лужно-силикатном електроліті при щільності струму ~20 А/дм 2 одержані покриття товщиною близько 100 мкм. Наведено результати дослідження морфології поверхні, фазового складу і твердості МДО-покриттів. Параметрами зміни служили склад електроліту і концентрація легуючих (Cu і Zn) елементів. Це дослідження проведено тому, що наявних в даний час даних не достатньо для уявлення про характер впливу хімічного складу алюмінієвого сплаву і умов електролізу (зокрема, складу електроліту) на механізм і кінетику перетворення γ→a. А без розуміння цього спрямована зміна структурного стану і властивостей МДО покриттів стає неможливою. В результаті досліджень було встановлено, що при мікродуговом оксидуванні алюмінієвих сплавів в лужному електроліті з додаванням рідкого скла (Na 2 SiO 3) різної концентрації зміцнений шар складається з оксидів a-А1 2 О 3 , γ-А1 2 О 3 і муллита 3Al 2 O 3 • 2SiO 2. Дані рентгеноструктурного аналізу покриттів свідчать про кристалічну будову покриттів. Встановлено, що легування алюмінію міддю і цинком істотно впливає на фазовий склад покриття, змінюючи кількісне співвідношення фаз нелінійним чином. Найбільший вміст a-А1 2 О 3 фази (до 60 об. %) досягається при легуванні Cu. При цьому найбільш висока твердість МДО покриттів досягається при використанні електроліту складу 1 г/л KOH і 6 г/л Na 2 SiO 3 в алюмінієвих сплавах при вмісті міді більше 3 %, а цинку-2-3 %. Встановлено, що механізм формування фазового складу слід пов'язати зі стабілізацією і дестабілізацією фази γ-А1 2 О 3. З цього для досягнення високої твердості слід вибирати ті легуючі елементи, які впливають на дестабілізацію γ-А1 2 О 3 , що забезпечує утворення фази a-А1 2 О 3 (корунд). У зв'язку з цим виявлено, що катіони Cu 2+ сприяють дестабілізації фази γ-А1 2 О 3 , а катіони Zn 2+ призводять до стабілізації фази γ-А1 2 О 3 при утриманні Zn>3 % Ключові слова: мікродугове оксидування, анодно-катодний режим, склад електроліту, легування, фазовий склад, корунд

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Section: Literature Review and Problem Statementmentioning

confidence: 77%

“…The latter was determined by an increase in luminosity. It is known that the properties of MAO coatings (base layer) are primarily determined by their phase composition [31,35].…”

Section: Results Of the Study Of The Influence Of Mao Treatment Regimmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…These microdischarges have a thermal and plasmochemical effect on the coating itself and electrolyte [28,29]. As a result, the hardness and strength of materials increase [30,31].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Subbotinа¹,

Al-Qawabeha²,

Belozerov³

et al. 2019

EEJET

Self Cite

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Study of optical characteristics of microdischarges in the micro-arc oxidation process

Pecherskaya,

Konovalov,

Golubkov

et al. 2024

Vacuum

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The effect of electrolysis conditions during microarc oxidation on the phase-structural state, hardness and corrosion resistance of magnesium alloys

Subbotinа

Belozerov

2020

Phys. Chem. Solid St.

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By the method of microarc oxidation for different types of electrolytes (which include KOH, Na2SiO3, Н2О2, NaOH, NaAlO2, Na5P3O10, NaF) and electrolysis conditions, multifunctional ceramic coatings on a magnesium alloy were obtained. The phase composition of the coating includes magnesium oxide (MgO), spinel MgAl2O4, Mg2SiO4 and Мg3(РО4)2 compounds. The phase composition of the coatings is determined by the composition of the electrolyte. The obtained MAO coatings provide high hardness, which is 1500 to 7300 MPa, as well as high corrosion resistance. The results obtained make it possible to recommend MAO coatings on magnesium alloys both as an external (functional) layer and for the formation of an underlayer for the subsequent application of protective coatings (varnishes, polymers, polytetrafluoroethylene, in particular).

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The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

Cited by 10 publications

References 29 publications

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Study of optical characteristics of microdischarges in the micro-arc oxidation process

The effect of electrolysis conditions during microarc oxidation on the phase-structural state, hardness and corrosion resistance of magnesium alloys

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The influence of the conditions of microplasma processing (microarc oxidation in anode­cathode regime) of aluminum alloys on their phase composition

Cited by 10 publications

References 29 publications

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Study of optical characteristics of microdischarges in the micro-arc oxidation process

The effect of electrolysis conditions during microarc oxidation on the phase-structural state, hardness and corrosion resistance of magnesium alloys

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The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition