Effect of temperature on electrochemical deposition of calcium phosphate coatings in a simulated body fluid

Calcium phosphate coatings were electrochemically deposited on titanium from the aqueous solution of Ca(NO3)2 and NH4H2PO4 with the current density of 10 mA cm-2 for deposition time of 15 min. The obtained brushite coatings, (CaHPO4?2H2O), were converted to hydroxyapatite (HA) by soaking in simulated body fluid (SBF) for 2, 7 and 14 days. The brushite and hydroxyapatite coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). It was shown that the increase in soaking time increases the porosity, roughness and crystallite domain size of HA coatings and decreases the unit cell parameters and unit cell volume, while does not affect the HA mean pore area. The calcium and phosphorus ions concentrations in SBF were determined by atomic absorption spectroscopy (AAS) and UV-Vis spectroscopy, respectively and the mechanism of HA growth based on dissolution-precipitation was proposed.

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Bioactivity of calcium phosphate coatings prepared by electrodeposition in a modified simulated body fluid

Materials Letters ◽

10.1016/j.matlet.2005.07.091 ◽

2006 ◽

Vol 60 (21-22) ◽

pp. 2573-2577 ◽

Cited By ~ 57

Author(s):

Ji-Ho Park ◽

Doug-Youn Lee ◽

Keun-Taek Oh ◽

Yong-Keun Lee ◽

Kwang-Mahn Kim ◽

...

Keyword(s):

Calcium Phosphate ◽

Simulated Body Fluid ◽

Body Fluid ◽

Phosphate Coatings ◽

Calcium Phosphate Coatings

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In Vitro Degradation Behaviors of Manganese-Calcium Phosphate Coatings on an Mg-Ca-Zn Alloy

Scanning ◽

10.1155/2018/6268579 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Yichang Su ◽

Yingchao Su ◽

Wei Zai ◽

Guangyu Li ◽

Cuie Wen

Keyword(s):

Calcium Phosphate ◽

Simulated Body Fluid ◽

Body Fluid ◽

Electrochemical Corrosion ◽

Hydrogen Release ◽

Phosphate Coatings ◽

Degradation Behaviors ◽

Calcium Phosphate Coatings ◽

Zn Alloy

In order to decrease the degradation rate of magnesium (Mg) alloys for the potential orthopedic applications, manganese-calcium phosphate coatings were prepared on an Mg-Ca-Zn alloy in calcium phosphating solutions with different addition of Mn2+. Influence of Mn content on degradation behaviors of phosphate coatings in the simulated body fluid was investigated to obtain the optimum coating. With the increasing Mn addition, the corrosion resistance of the manganese-calcium phosphate coatings was gradually improved. The optimum coating prepared in solution containing 0.05 mol/L Mn2+ had a uniform and compact microstructure and was composed of MnHPO4·3H2O, CaHPO4·2H2O, and Ca3(PO4)2. The electrochemical corrosion test in simulated body fluid revealed that polarization resistance of the optimum coating is 36273 Ωcm2, which is about 11 times higher than that of phosphate coating without Mn addition. The optimum coating also showed the most stable surface structure and lowest hydrogen release in the immersion test in simulated body fluid.

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