Formation of zirconia tetragonal phase by plasma electrolytic oxidation of zirconium alloy in electrolyte comprising additives of yttria nanopowder

Apelfeld, A. V.; Ашмарин, А. А.; Борисов, А. М.; Виноградов, А. В.; Савушкина, С. В.; Shmytkova, E. A.

doi:10.1016/j.surfcoat.2016.09.071

Cited by 29 publications

(16 citation statements)

References 24 publications

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“…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%

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

Sowa

Simka

2018

Materials

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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.

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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

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“…However, plasma electrolytic oxidation (PEO) coatings attracted attention in the last decade regarding the improvement of wear and corrosion resistance of zirconium nuclear alloys by growing ZrO 2 protective layers during electrochemical oxidation of metal surfaces [11,12]. Additionally, taking into account the limited available literature on PEO-treated Zr alloys, including Zy-2 [13,14], Zy-4 [15,16], Zr-1%Nb [17,18] and Zr-2.5%Nb [19,20], further work will be required to optimize and improve the coating layers in the approach of material-coolant interaction.…”

Section: Sodium Silicatementioning

confidence: 99%

Plasma Electrolytic Oxidation Treatment of Zr-2.5%Nb Alloy for Corrosion Resistance Enhancement

Coaca¹,

Marin²,

Rusu³

et al. 2019

Rev. Chim.

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Anticorrosion layers were prepared on commercial Zr-2.5%Nb alloy by employing plasma electrolytic oxidation (PEO) process in aqueous electrolyte solutions. Microstructure and electrochemical behavior were evaluated using X-ray diffraction (XRD), optical metallography and potentiodynamic polarization measurements. The obtained coatings are uneven, presenting a dominant monoclinic crystallographic phase of ZrO2. Enhanced corrosion resistance was attributed to the PEO-treated samples compared to the commercial black oxide coating.

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“…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%

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

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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.

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Formation of zirconia tetragonal phase by plasma electrolytic oxidation of zirconium alloy in electrolyte comprising additives of yttria nanopowder

Cited by 29 publications

References 24 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 Treatment of Zr-2.5%Nb Alloy for Corrosion Resistance Enhancement

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

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