Different Morphology of Hydroxyapatite Coatings on Titanium by Electrophoretic Deposition

2006 ◽  
Vol 309-311 ◽  
pp. 639-642 ◽  
Author(s):  
Xian Wei Meng ◽  
Tae Yub Kwon ◽  
Kyo Han Kim
Keyword(s):  
Electrophoretic Deposition ◽  
Hydroxyapatite Coating ◽  
Applied Potential ◽  
Experimental Conditions ◽  
Powder Concentration ◽  
Hydroxyapatite Coatings ◽  
Deposition Yield ◽  
Coating Morphology ◽  
Titanium Substrates

Commercial hydroxyapatite powders were electrophoretically deposited on titanium substrates. In this study, the effect of deposition durations and applied voltages on deposition yield was investigated. Green and sintered coatings were studied by SEM and XRD. It was observed that by applying low voltages and presedimentation, uniform and smooth hydroxyapatite coating can be prepared. In order to obtain roughened hydroxyapatite coatings, high voltages have to be applied. It was concluded that experimental conditions of powder concentration, applied potential, and presedimentation have a significant effect on the deposited coating morphology.

scholarly journals Effect of Hydroxyapatite Coatings on Corrosion Behavior for Biotype 316L SS Used in Orthopaedic Applications

2010 ◽  
Vol 7 (3) ◽  
pp. 1237-1243
Author(s):  
Baghdad Science Journal
Keyword(s):  
Open Circuit Potential ◽  
Sintering Temperature ◽  
Electrochemical Corrosion ◽  
Substrate Material ◽  
Open Circuit ◽  
Applied Potential ◽  
Experimental Conditions ◽  
Ringer’S Solution ◽  
Optimum Parameters ◽  
Hydroxyapatite Coatings

Electrochemical corrosion of hydroxyapatite (HAP) coated performance depends on various parameters like applied potential, time, thickness and sintering temperature. Thus, the optimum parameters required for the development of stable HAP coatings was found by using electrophoretic deposition (EPD) technique. This study discusses the results obtained from open circuit potential-time measurements (OCP-time), potentiodynamic polarisation and immersion tests for all alloy samples done under varying experimental conditions, so that the optimum coating parameters can be established. The ageing studies of the coated samples were carried out by immersing them in Ringer’s solution for a period of 30 days indicates the importance of stable HAP coatings to prevent corrosion on the substrate material, so that enhancement to the biocompatibility will be increased.

Electrocapillary discharge of a liquid

1968 ◽  
Vol 33 (3) ◽  
pp. 573-575 ◽  
Author(s):  
D. Michelson
Keyword(s):  
Sodium Chloride ◽  
Applied Potential ◽  
Experimental Conditions

The current I flowing in the steady electrocapillary discharge of saturated aqueous and alcohol solutions of sodium chloride was found to be proportional to e−α/V, where V is the applied potential and α is a constant under fixed experimental conditions.

scholarly journals Hydroxyapatite Coatings on Titanium Alloy TNTZ using Electrophoretic Deposition

2019 ◽  
Vol 602 ◽  
pp. 012071
Author(s):  
Gunawarman ◽  
N F Nuswantoro ◽  
D Juliadmi ◽  
H Fajri ◽  
A Budiman ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electrophoretic Deposition ◽  
Hydroxyapatite Coatings

Electrophoretic deposition of hydroxyapatite coating on biodegradable Mg–4Zn–4Sn–0.6Ca–0.5Mn alloy

2019 ◽  
Vol 36 (9) ◽  
pp. 908-918 ◽  
Author(s):  
Ahmad Saadati ◽  
Hamid Hesarikia ◽  
Mohammad Reza Nourani ◽  
Ramezan Ali Taheri
Keyword(s):  
Electrophoretic Deposition ◽  
Hydroxyapatite Coating

Analysis of corrosion behaviour and surface properties of plasma-sprayed composite coating of hydroxyapatite–tantalum on biodegradable Mg alloy ZK60

2019 ◽  
Vol 53 (19) ◽  
pp. 2661-2673 ◽  
Author(s):  
Balraj Singh ◽  
Gurpreet Singh ◽  
Buta Singh Sidhu
Keyword(s):  
Corrosion Resistance ◽  
Surface Properties ◽  
Corrosion Behaviour ◽  
Surface Hardness ◽  
Mg Alloy ◽  
Hydroxyapatite Coating ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed ◽  
Incremental Increase

Magnesium (Mg) and its alloys are promising candidates for biodegradable bio-implants. However, the excessive corrosion in the physiological environment and subsequent decline in the mechanical integrity of Mg and its alloys have limited their utility as biomaterials. In the present study, an attempt has been made to improve the corrosion resistance of Mg alloy ZK60 plasma sprayed with tantalum (Ta)-reinforced hydroxyapatite coating. The experiment was conducted with three varied levels, i.e. 10, 20 and 30 weight percent (wt%) of Ta-content in hydroxyapatite coating. The coatings were characterized and in vitro corrosion behaviour was investigated by electrochemical measurements in Ringer's solution along with the analysis of surface properties. The corrosion resistance of the Mg alloy increased with the incremental increase in Ta reinforcement in hydroxyapatite coating. An increase in the protection efficiency was analysed for the Ta-reinforced hydroxyapatite coatings (∼10%, 18% and 23% for hydroxyapatite-10Ta, hydroxyapatite-20Ta and hydroxyapatite-30Ta, respectively) as compared to the pure hydroxyapatite coating. The hydroxyapatite coating effectively increased the surface hardness of the Mg alloy and Ta reinforcement further enhanced it. Surface roughness decreased with the incremental increase in Ta-content in hydroxyapatite coating. Wettability analysis revealed the hydrophilic nature of pure hydroxyapatite and Ta-reinforced hydroxyapatite coatings. The results of the study suggest that the proposed Ta reinforcement in hydroxyapatite is potentially important for biodegradable Mg bio-implants.

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