Effects of pulsed current and H2O2 amount on the composition of electrodeposited calcium phosphate coatings

Drevet, Richard; Benhayoune, Hicham; Wortham, Laurence; Potiron, S.; Douglade, J.; Laurent-Maquin, Dominique

doi:10.1016/j.matchar.2010.04.016

Cited by 55 publications

(36 citation statements)

References 35 publications

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“…According to Gopi et al ., Benhayoune et al., and other, the pulsed electrodeposition retains the polarization and improves the adhesion properties of the coatings on the substrate surface by the disappearance of the holes and craters. Furthermore, the pulsed deposition gives deposits of smaller grain size and of more uniform morphology, as compared to the direct continuous current cases.…”

Section: Resultsmentioning

confidence: 97%

“…Following Benhayoune et al . and Eliaz and Sridhar, during pulsed electrodeposition in pulsed current mode, the application of a high current density leads to a greater cathodic potential, which increases the pH value on the substrate/electrolyte interface, and at a pH more than 12, the minority species is

{HPO}_{4}^{2 -}

and the predominant specie is

{PO}_{4}^{3 -}

. Therefore, from the reactions and , two phases of apatite kinds can be deposited, calcium‐deficient hydroxyapatite (Ca‐def HA; CDHA) according to the reaction :

false(10 - x false) {Ca}^{2 +} + false(6 - x false) {PO}_{4}^{-} + x {HPO}_{4}^{-} + false(2 - x false) {OH}^{-} ⟶ {Ca}_{10 - x} {({HPO}_{4})}_{x} {({PO}_{4})}_{6 - x} {(OH)}_{2 - x} with 0 ≺ x \leq 2,

and stoichiometric hydroxyapatite according to the following reaction :

10 {Ca}^{2 +} + 6 {PO}_{4}^{3 -} + 2 {OH}^{-} ⟶ {Ca}_{10} {({PO}_{4})}_{6} {(OH)}_{2} .

…”

Section: Resultsmentioning

confidence: 99%

“…To solve this problem, a pulsed current for electrodeposition coatings on sandblasted surfaces substrates associated with H 2 O 2 into electrolyte solution is employed. In fact, during the break time ( t off ) of the pulse cycle, the H 2 bubbles can leave the substrate surface and allow ions to diffuse from the solution to the cathode surface …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of HA/FHA Coatings on Smooth and Rough Implant Surface by Pulsed Electrodeposition

Bir

Khireddine

Ksouri

et al. 2015

Int J Applied Ceramic Tech

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In this work, hydroxyapatite (HA) and fluorohydroxyapatite (FHA) coatings have been successfully synthesized with an electrochemical deposition method, using pulsed current deposition mode on smooth and rough 316L stainless steel implant surfaces. The impact of the variation of the current density was also studied. The surface morphology and chemical composition of the coatings were characterized by scanning electron microscopy associated with energy-dispersive X-ray spectroscopy (SEM-EDX), and X-ray photoelectron spectroscopy (XPS). The structural characterization is carried out by X-ray diffraction (XRD) and Fourier-transformed infrared (FT-IR) spectroscopy. Furthermore, thickness, roughness, and wettability of the coating are determined. The experimental results showed that the electrodeposition on rough surface promotes deposition of dense and homogeneous layers. It also shows that uniform and smooth films were obtained at low current densities compared to high current densities. Potentiodynamic polarization results in simulated body fluid (SBF) indicate that the coatings thickness and the incorporation of the fluorine ions into hydroxyapatite crystals play an important role in improving the corrosion resistance of the substrate. Moreover, cyclic voltammetry studies clearly suggest that the addition of H 2 O 2 and F À ions into the electrolyte solution catalyses a reduction reactions and favorites fluorohydroxyapatite formation. *bir.fatima@yahoo.fr

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Section: Resultsmentioning

confidence: 97%

{HPO}_{4}^{2 -}

and the predominant specie is

{PO}_{4}^{3 -}

. Therefore, from the reactions and , two phases of apatite kinds can be deposited, calcium‐deficient hydroxyapatite (Ca‐def HA; CDHA) according to the reaction :

false(10 - x false) {Ca}^{2 +} + false(6 - x false) {PO}_{4}^{-} + x {HPO}_{4}^{-} + false(2 - x false) {OH}^{-} ⟶ {Ca}_{10 - x} {({HPO}_{4})}_{x} {({PO}_{4})}_{6 - x} {(OH)}_{2 - x} with 0 ≺ x \leq 2,

and stoichiometric hydroxyapatite according to the following reaction :

10 {Ca}^{2 +} + 6 {PO}_{4}^{3 -} + 2 {OH}^{-} ⟶ {Ca}_{10} {({PO}_{4})}_{6} {(OH)}_{2} .

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of HA/FHA Coatings on Smooth and Rough Implant Surface by Pulsed Electrodeposition

Bir

Khireddine

Ksouri

et al. 2015

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…The use of H 2 O 2 , stirring, pulsed time electric fields, or pressure has been employed to avoid the negative effects of H 2 gas and to improve the adherence and coating uniformity [83][84][85]. The use of H 2 O 2 , stirring, pulsed time electric fields, or pressure has been employed to avoid the negative effects of H 2 gas and to improve the adherence and coating uniformity [83][84][85].…”

Section: Biomimetics and Other Solution-based Processing Methodsmentioning

confidence: 99%

Bioceramic Coatings for Medical Implants

Cabañas

2014

Bio‐Ceramics With Clinical Applications

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“…The stoichiometric HAP coatings electrodeposition is performed with a three‐electrode system immersed in an electrolyte prepared by dissolving 0.042 M Ca(NO 3 ) 2 4H 2 O and 0.025 M NH 4 (H 2 PO 4 ) in ultra‐pure water in which hydrogen peroxide (9% in volume) is added as described in our previous work 27. The Ti6Al4V substrates are 10 mm × 10 mm × 0.6 mm in size.…”

Section: Methodsmentioning

confidence: 99%

Thermal Treatment Optimization of Electrodeposited Hydroxyapatite Coatings on Ti6Al4V Substrate

2012

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Thermal behavior of electrodeposited hydroxyapatite (HAP) coating on a titanium alloy (Ti6Al4V) is investigated in order to optimize the heat treatment conditions for this prosthetic material. The synthesized coatings are annealed in air atmosphere at 400, 600, 800, and 1000 °C, and then characterized by X‐ray diffraction (XRD) and selected area electron diffraction (SAED) for structure and phases analysis. Scanning and transmission electron microscopy associated to energy dispersive X‐ray microanalysis (SEM‐EDXS and STEM) are used for morphology and composition analysis. The results show that when the electrodeposited coating is annealed at temperatures greater than 600 °C, a well‐crystallized HAP is obtained with a notable change of its morphology. However, at these temperatures the surface of Ti6Al4V alloy (uncoated zones of the implant) is deteriorated by the formation of a thick surface oxide layer. Therefore, we limit the heat treatment temperature for the electrodeposited coatings on a Ti6Al4V alloy at 550 °C. At this optimized temperature it is demonstrated that the link between the coating and the substrate is improved and the crystallinity of the coating is controlled which make it well bioactive.

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Effects of pulsed current and H2O2 amount on the composition of electrodeposited calcium phosphate coatings

Cited by 55 publications

References 35 publications

Characterization of HA/FHA Coatings on Smooth and Rough Implant Surface by Pulsed Electrodeposition

Characterization of HA/FHA Coatings on Smooth and Rough Implant Surface by Pulsed Electrodeposition

Bioceramic Coatings for Medical Implants

Thermal Treatment Optimization of Electrodeposited Hydroxyapatite Coatings on Ti6Al4V Substrate

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