Investigation of zirconia tetragonal phase coatings formed by plasma electrolytic oxidation

Савушкина, С. В.; Ашмарин, А. А.; Apelfeld, A. V.; Борисов, А. М.; Виноградов, А. В.; Polyansky, M. N.; Богдашкина, Н. Л.

doi:10.1088/1742-6596/857/1/012037

Cited by 9 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The outermost oxide layer was highly porous (the porosity increased with the voltage) and thick, while the barrier layer resided at the oxide-metal interface. Such an arrangement is typical for the PEO oxide films [ 36 , 42 , 45 , 50 , 51 , 66 ]. The EDX mapping in Figure 6 g–i indicate that mostly all elements are uniformly spread across the coatings’ thickness.…”

Section: Resultsmentioning

confidence: 99%

“…However, since 2007, many reports of PEO of Zircaloys [ 32 , 33 ] and other Zr alloys [ 34 , 35 , 36 ], as well as pure zirconium [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ], were to be found. Most of the studies were mainly concerned with the surface characterization of the coatings that were obtained in the silicate-based electrolytes [ 34 , 35 , 36 , 41 , 44 , 49 , 50 , 51 , 52 ]. Among the groups that were working on the synthesis of bioactive PEO films on Zr, only a few papers can be found on the treatments that were conducted in the electrolytes other than calcium acetate + calcium β-glycerophosphate systems [ 41 , 43 , 46 , 53 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of DC Plasma Electrolytic Oxidation on Surface Characteristics and Corrosion Resistance of Zirconium

Sowa

Simka

2018

Materials

View full text Add to dashboard Cite

Zr is a valve metal, the biocompatibility of which is at least on par with Ti. Recently, numerous attempts of the formation of bioactive coatings on Zr by plasma electrolytic oxidation (PEO) in solutions that were based on calcium acetate and calcium β-glycerophosphate were made. In this study, the direct current (DC) PEO of commercially pure zirconium in the solutions that contained Ca(H2PO2)2, Ca(HCOO)2, and Mg(CH3COO)2 was investigated. The treatment was conducted at 75 mA/cm2 up to 200, 300, or 400 V. Five process stages were discerned. The treatment at higher voltages resulted in the formation of oxide layers that had Ca/P or (Mg+Ca)/P ratios that were close to that of hydroxyapatite (Ca/P = 1.67), determined by SEM/EDX. The corrosion resistance studies were performed using electrochemical impedance spectroscopy (EIS) and DC polarization methods. R(Q[R(QR)]) circuit model was used to fit the EIS data. In general, the coatings that were obtained at 200 V were the most corrosion resistant, however, they lacked the porous structure, which is typical for PEO coatings, and is sought after in the biomedical applications. The treatment at 400 V resulted in the formation of the coatings that were more corrosion resistant than those that were obtained at 300 V. This was determined mainly by the prevailing plasma regime at the given process voltage. The pitting resistance of Zr was also improved by the treatment, regardless of the applied process conditions.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of DC Plasma Electrolytic Oxidation on Surface Characteristics and Corrosion Resistance of Zirconium

Sowa

Simka

2018

Materials

View full text Add to dashboard Cite

show abstract

“…PEO process is impacted by different parameters such as nature of substrate material, electrolyte constituents, the density of the current, type of current, voltage, frequency, duty cycle, additives, particles incorporated, coating time, and operational temperature [ 3 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. Although this process has been widely used for materials such as aluminum and its alloys [ 50 , 52 , 53 , 54 , 55 ], and magnesium and its alloys [ 56 , 57 , 58 , 59 , 60 ], the focus of more recent research on PEO coatings are oriented towards other valve metals like titanium [ 61 , 62 , 63 , 64 , 65 ], tantalum [ 66 , 67 , 68 , 69 , 70 ], zirconium [ 71 , 72 , 73 , 74 , 75 ], and niobium and all their different alloys [ 76 , 77 , 78 , 79 , 80 ]. Moreover, there has also been considerable work reported on zinc modification by the PEO process [ 81 , 82 ,…”

Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

et al. 2021

View full text Add to dashboard Cite

Plasma electrolytic oxidation (PEO) is a novel surface treatment process to produce thick, dense metal oxide coatings, especially on light metals, primarily to improve their wear and corrosion resistance. The coating manufactured from the PEO process is relatively superior to normal anodic oxidation. It is widely employed in the fields of mechanical, petrochemical, and biomedical industries, to name a few. Several investigations have been carried out to study the coating performance developed through the PEO process in the past. This review attempts to summarize and explain some of the fundamental aspects of the PEO process, mechanism of coating formation, the processing conditions that impact the process, the main characteristics of the process, the microstructures evolved in the coating, the mechanical and tribological properties of the coating, and the influence of environmental conditions on the coating process. Recently, the PEO process has also been employed to produce nanocomposite coatings by incorporating nanoparticles in the electrolyte. This review also narrates some of the recent developments in the field of nanocomposite coatings with examples and their applications. Additionally, some of the applications of the PEO coatings have been demonstrated. Moreover, the significance of the PEO process, its current trends, and its scope of future work are highlighted.

show abstract

“…In recent years, a significant number of papers devoted to improving the characteristics of coatings on zirconium and its alloys by incorporating fine particles into their structure from slurry electrolytes during PEO treatment have been published [33][34][35][36]. So, additions to the alkaline electrolyte of such oxides nanoparticles as Al 2 O 3 , ZrO 2 , and CeO 2 during the formation of PEO coatings on zirconium promote increasing in their corrosion-protective ability in 3.5% NaCl.…”

Section: Introductionmentioning

confidence: 99%

“…The PEO coating formed in the electrolyte without additives reduced the corrosion current by two orders of magnitude in comparison with untreated zirconium. In [35,36], the possibility of zirconia high-temperature phases (tetragonal t-ZrO 2 and cubic c-ZrO 2 ) stabilizing in PEO coatings by introducing additives of yttria nanoparticles in electrolytes was investigated. In [37,38], high thermal shock resistance and good thermal barrier properties of PEO coatings on zirconium and its alloys were noted.…”

Section: Introductionmentioning

confidence: 99%

Study of Coatings Formed on Zirconium Alloy by Plasma Electrolytic Oxidation in Electrolyte with Submicron Yttria Powder Additives

Савушкина

Герасимов

Apelfeld

et al. 2021

Metals

View full text Add to dashboard Cite

Coatings with thickness 40 to 150 μm were formed by plasma electrolytic oxidation (PEO) on the zirconium alloy Zr-1Nb (Zr-1% Nb) in the slurry electrolyte containing 9 g/L Na2SiO3 5H2O, 5 g/L Na(PH2O2) and 6 g/L submicron Y2O3 yttria powder during 60 min under the AC electrical mode at current densities 20; 30 and 40 A/dm2. The surface morphology, structure, composition, and corrosion-protective ability of the formed coatings have been analyzed. At PEO current density 30 A/dm2, a predominantly tetragonal phase of zirconia was formed in coatings. Increasing the PEO current density up to 40 A/dm2 promoted the formation of the coating surface layer containing submicron yttria particles. Electrochemical polarization studies in 0.5% LiOH solution showed that PEO coatings demonstrated high corrosion-protective ability. The dependence of the polarization currents on the PEO current density was found to be inconsequential.

show abstract

Investigation of zirconia tetragonal phase coatings formed by plasma electrolytic oxidation

Cited by 9 publications

References 10 publications

Effect of DC Plasma Electrolytic Oxidation on Surface Characteristics and Corrosion Resistance of Zirconium

Effect of DC Plasma Electrolytic Oxidation on Surface Characteristics and Corrosion Resistance of Zirconium

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

Study of Coatings Formed on Zirconium Alloy by Plasma Electrolytic Oxidation in Electrolyte with Submicron Yttria Powder Additives

Contact Info

Product

Resources

About