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Terleeva, O. P.; Belevantsev, V. I.; Slonova, A. I.

doi:10.1023/a:1021943224896

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…A voltage transition has been previously observed [20,21] during AC PEO of aluminium and it was assigned to changes in the effective conductivity of discharges [20]. It is not intended here to differentiate between sparks, microarcs, arcs and glow discharges, since, to the authors' knowledge, their identification during PEO is complex [22,23]. The time dependence of the instantaneous current in the cell revealed changes in the initially set square current waveform ( Fig.…”

Section: Voltage-and Current-time Responsesmentioning

confidence: 73%

Characterization of AC PEO coatings on magnesium alloys

Arrabal

Matykina

Hashimoto

et al. 2009

Surface and Coatings Technology

328

154

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Section: Voltage-and Current-time Responsesmentioning

confidence: 73%

Characterization of AC PEO coatings on magnesium alloys

Arrabal

Matykina

Hashimoto

et al. 2009

Surface and Coatings Technology

328

154

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“…A study of microdischarge characteristics, especially their time dependence and thermal effects on the surface layers formed (in particular under AC regimes of PEO), remains therefore of great interest. Unfortunately, this issue was not properly addressed in any of the more recent works on AC PEO process characterization [17][18][19][20][21]. In this study, we shall, therefore, discuss a correlation between the oxide ceramic layer formation process and the spatial characteristics of microdischarges appearing at the surface of an Al alloy during AC PEO, and, also, estimate electrical parameters of the microdischarges and their thermal effect on the surface layer.…”

Section: Introductionmentioning

confidence: 97%

Discharge characterization in plasma electrolytic oxidation of aluminium

Yerokhin

Snizhko

Gurevina

et al. 2003

J. Phys. D: Appl. Phys.

430

199

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Digital video imaging of the plasma electrolytic oxidation (PEO) of aluminium has been performed, which allowed evaluation of both dimensional characteristics of individual microdischarges appearing at the oxide–electrolyte interface and their collective behaviour throughout the oxidation process. It has been shown that the microdischarge cross-sectional dimensions vary within the range 0.01–1.35 mm2. In the course of PEO processing, small localized events (<0.03 mm3) always dominate in the microdischarge spatial distribution and the relative proportion of medium-sized to very large microdischarges is gradually redistributed in favour of the latter. Temporal dependences have been found for the fraction of surface area instantaneously experiencing the discharge, as well as for the spatial and current densities of the microdischarge. Discharge mechanisms occurring during PEO are discussed and a model of microdischarge formation is suggested, assuming the possibility of free-electron generation and glow discharge ignition in the gaseous media developed at the oxide–electrolyte interface. First approximation evaluations of thermal processes in the oxide layer under the discharge conditions have been considered. The estimated ranges of the microdischarge current density (50–18 kA m−2) and duration (0.25–3.5 ms) sufficient for initiating phase transitions (e.g. γ–α transformation and melting) in the surface oxide layer are shown to be in good agreement with experimental data.

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“…The effect of pH in borate electrolytes on the microplasma process was studied by complex analysis of discharges [13,20] appearing on the sample surface, the behavior of the anode (Ua) and cathode (U) voltages, the stages of the process [10,20], and the characteristics of the coatings produced. The variation in the pH value of the electrolyte leads to a series of qualitative and quantitative changes in the parameters of the process and the characteristics of the coatings formed.…”

Section: Resultsmentioning

confidence: 99%

Microplasma synthesis of Fe-containing coatings on aluminum in homogeneous electrolytes

Rogov

Terleeva

Миронов

et al. 2012

Prot Met Phys Chem Surf

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In this work, we suggest a method for microplasma synthesis of multicomponent iron containing oxide coatings on the surface of aluminum alloys. For producing the coatings, we use a homogeneous elec trolyte that contains iron in the form of its complexes with EDTA 4-and has a pH value of 9-10. The dynam ics of the decrease in the pH value of the electrolyte is studied during microplasma formation of the coatings. The content of iron in the coatings is determined. The morphology, microstructure, and phase composition of the coatings obtained are studied by optical microscopy and X ray powder diffraction analysis.

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Cited by 14 publications

References 4 publications

Characterization of AC PEO coatings on magnesium alloys

Characterization of AC PEO coatings on magnesium alloys

Discharge characterization in plasma electrolytic oxidation of aluminium

Microplasma synthesis of Fe-containing coatings on aluminum in homogeneous electrolytes

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