Electrophoretic deposition of nano-zirconia coating on AZ91D magnesium alloy for bio-corrosion control purposes

Amiri, Hamed; Mohammadi, Iman; Afshar, Abdollah

doi:10.1016/j.surfcoat.2016.12.103

Cited by 54 publications

(25 citation statements)

References 36 publications

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“…Atomic-force microscopy (AFM) was used to investigate the surface morphology and roughness of the uncoated and coated samples. Coating bonding measurements were carried out by a pull-off test using a portable adhesion tester according to standard test method ASTM D4541 [48,49].…”

Section: Preparation Of the Powder Samples Of Uncoated Mgo-coated Anmentioning

confidence: 99%

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

et al. 2017

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Abstract:In the field of orthopedics, magnesium (Mg) and magnesium-based composites as biodegradable materials have attracted fundamental research. However, the medical applications of magnesium implants have been restricted owing to their poor corrosion resistance, especially in the physiological environment. To improve the corrosion resistance of Mg/HA/TiO 2 nanocomposites, monolayer MgO and double-layer Si/MgO coatings were fabricated layer-by-layer on the surface of a nanocomposite using a powder metallurgy route. Then, coating thickness, surface morphology, and chemical composition were determined, and the corrosion behavior of the uncoated and coated samples was evaluated. Field-emission scanning electron microscopy (FE-SEM) micrographs show that an inner MgO layer with a porous microstructure and thickness of around 34 µm is generated on the Mg/HA/TiO 2 nanocomposite substrate, and that the outer Si layer thickness is obtained at around 23 µm for the double-layered coated sample. Electrochemical corrosion tests and immersion corrosion tests were carried out on the uncoated and coated samples and the Si/MgO-coated nanocomposite showed significantly improved corrosion resistance compared with uncoated Mg/HA/TiO 2 in simulated body fluid (SBF). Corrosion products comprising Mg(OH) 2 , HA, Ca 3 (PO 4 ) 2 , and amorphous CaP components were precipitated on the immersed samples. Improved cytocompatibility was observed with coating as the cell viability ranged from 73% in uncoated to 88% for Si/MgO-coated Mg/HA/TiO 2 nanocomposite after nine days of incubation.

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Section: Preparation Of the Powder Samples Of Uncoated Mgo-coated Anmentioning

confidence: 99%

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

et al. 2017

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“…The parameter time was also varied from 10 to 30 minutes for the deposition. [12][13][14][15] A stainless steel sheet with a working area of 100 × 50 mm 2 was used as the anode. Alumina crucible samples were used as a working electrode (cathode).…”

Section: Methodsmentioning

confidence: 99%

Electrophoretic Deposition of Zirconia on Alumina for Molten Salt Applications

Mideen¹,

Venkatasubramanian²,

Sridhar³

et al. 2020

RJC

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Electrophoretic deposition of zirconia on alumina crucibles was carried out at constant voltage conditions from zirconia suspension prepared with isopropyl alcohol. The phase purity and surface morphology of coated samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray analysis. The maximum deposit yield was obtained with a direct current potential of 125 V. The substrates pretreated with acid-base and subjected for sintering temperature 1100°C for one hour showed excellent adhesion on both sides. The X-ray diffraction results showed the monoclinic phase is the major component and the average crystallite sizes of coated deposits were found as ~4.1μ. The absorption bands observed at 463 cm -1 , 743 cm -1 and at 486 cm -1 confirm the presence of ZrO 2 phases. The intensity of bands observed at 3415 cm -1 and 1634 cm -1 were gradually decreased due to sintering confirm the stretching and deformation of the O-H bond. The surface analysis showed that the zirconia particles are of uniform size and there is a considerable agglomeration of the particles on alumina substrates. The energy dispersive analysis indicated the presence of elemental Zr and O and sintering causes the penetration of agglomerated zirconia particles into the micropores present on alumina substrates and is responsible for excellent adhesion.

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“…Prosthesis 2020, 1, FOR PEER REVIEW 7 In the case of pure magnesium, an active dissolution could be seen in the anodic area, while the coated samples had a clear protective effect up to a specific breakthrough potential [30]. This is the same for zein and zein/BG and is represented by the kink at −1.2 V. The cathodic current density is reduced for the coated magnesium compared to the pure substrate [31].…”

Section: In Vitro Bioactivitymentioning

confidence: 96%

Zein/Bioactive Glass Coatings with Controlled Degradation of Magnesium under Physiological Conditions: Designed for Orthopedic Implants

Rehman

2020

Prosthesis

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Magnesium and its alloys are widely considered as temporary bio-implants owing to their mechanical properties and biocompatibility. However, the high corrosion rates and degradation in the physiological environment restrict the practical application of Mg as a biomedical device. Therefore, in this study, Zein/45S5 bioactive glass (BG) coatings were deposited via electrophoretic deposition (EPD) on pretreated pure magnesium (Mg) substrates, which controls the rapid degradation of magnesium. The set of EPD parameters was first optimized on stainless steel (SS) and then the optimum EPD parameters were applied to obtain zein/BG composite coatings on Mg substrates. The morphology of the obtained coatings was studied by scanning electron microscopy (SEM). SEM results showed that both zein and BG were successfully deposited on the surface of the Mg substrate. Electrochemical measurements consisting of open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization confirmed that the corrosion resistance of Mg improved after the deposition of zein/BG coatings. The in-vitro bioactivity study was carried out by immersing the zein/BG coatings in simulated body fluid for 3, 7, and 21 days. SEM, energy dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy results elucidated that the hydroxyapatite layer developed after 21 days of immersion in SBF, which confirmed the bone binding ability of the coatings.

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Electrophoretic deposition of nano-zirconia coating on AZ91D magnesium alloy for bio-corrosion control purposes

Cited by 54 publications

References 36 publications

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

Electrophoretic Deposition of Zirconia on Alumina for Molten Salt Applications

Zein/Bioactive Glass Coatings with Controlled Degradation of Magnesium under Physiological Conditions: Designed for Orthopedic Implants

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