Microarc oxidation discharge types and bio properties of the coating synthesized on zirconium

Cengiz, Sezgin; Azakli, Yunus; Tarakçı, Mehmet; Stanciu, Lia; Gençer, Yücel

doi:10.1016/j.msec.2017.03.230

Cited by 37 publications

(13 citation statements)

References 53 publications

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“…Furthermore, the observations of the plasma events on the treated surfaces were also similar. There is little data on the DC PEO U vs. t curves of zirconium or its alloys in the literature [ 32 , 38 ] apart from that belonging to the pulsed variant of the process [ 41 , 45 , 48 , 49 ]. The curve for the latter type of the treatment differs significantly in its shape and surface plasma events from the pure DC regime.…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…Initially, apart from the Zr-containing Ti alloys [ 8 , 30 , 31 ], relatively small interest was devoted to the research concerning PEO of Zr-based materials. 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 ].…”

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: Resultsmentioning

confidence: 99%

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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“…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

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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.

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“…The HAp coatings were grown on Ta samples by PEO at the potential in a range of 350 to 500 V, and treatment time from 60 to 600 s [163]. The formation of crystalline HAp was detected for samples treated over 180 s at 500 V. In [164], the coating was obtained by PEO on Zr in for process duration of 2 to 30 min. The increasing oxidation resulted in thicker and rougher coatings.…”

Section: Plasma Electrochemical Oxidation (Peo)mentioning

confidence: 99%

Electrodeposited Biocoatings, Their Properties and Fabrication Technologies: A Review

Zieliński¹,

Bartmański²

2020

Coatings

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Coatings deposited under an electric field are applied for the surface modification of biomaterials. This review is aimed to characterize the state-of-art in this area with an emphasis on the advantages and disadvantages of used methods, process determinants, and properties of coatings. Over 170 articles, published mainly during the last ten years, were chosen, and reviewed as the most representative. The most recent developments of metallic, ceramic, polymer, and composite electrodeposited coatings are described focusing on their microstructure and properties. The direct cathodic electrodeposition, pulse cathodic deposition, electrophoretic deposition, plasma electrochemical oxidation in electrolytes rich in phosphates and calcium ions, electro-spark, and electro-discharge methods are characterized. The effects of electrolyte composition, potential and current, pH, and temperature are discussed. The review demonstrates that the most popular are direct and pulse cathodic electrodeposition and electrophoretic deposition. The research is mainly aimed to introduce new coatings rather than to investigate the effects of process parameters on the properties of deposits. So far tests aim to enhance bioactivity, mechanical strength and adhesion, antibacterial efficiency, and to a lesser extent the corrosion resistance.

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Microarc oxidation discharge types and bio properties of the coating synthesized on zirconium

Cited by 37 publications

References 53 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

Electrodeposited Biocoatings, Their Properties and Fabrication Technologies: A Review

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