Electrochemical Deposition of the Ca-P Coatings on the Porous Nanocrystalline Ti-6Al-4V Alloy

G. Adamek; Jarosław Jakubowicz

doi:10.4028/www.scientific.net/SSP.183.1

Paper Titles

Electrochemical Deposition of the Ca-P Coatings on the Porous Nanocrystalline Ti-6Al-4V Alloy
p.1

Study of Iron-Based Alloys in Solid Oxide Fuel Cell Temperature and Atmosphere Conditions, Effect of a Silver-Coating
p.9

FEM Analysis of Lower Premolar Root Canal Filling
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Effect of Cavitation on Absorption and Transport of Hydrogen in Iron
p.25

Prevention to Hydrogen Degradation of Steel
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Determination of Failure Causes of a Steam Turbine Casing
p.37

Effect of the Ceramic Dispersion in the Nickel Matrix Composite Coatings on Corrosion Properties after Plastic Working
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Iodine-Induced Stress Corrosion Cracking of Zircaloy-4: Identification of Critical Parameters Involved in Intergranular to Transgranular Crack Propagation
p.49

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Electrochemical Deposition of the Ca-P Coatings on the Porous Nanocrystalline Ti-6Al-4V Alloy

Abstract:

The formation mechanism of the Ca–P coating on the porous nanocrystalline Ti-6Al-4V alloy is presented. The Ca–P compounds were cathodically deposited at different potential (from –0.5 to –10 V vs. open circuit potential), using a solution mixture of Ca (NO₃)₂ + (NH₄)₂HPO₄ + HCl. Depending of the deposition potential, the atomic ratio of Ca/P in deposits is in the range from 0.25 to 1.71, which indicates that the coating composition corresponds in some cases to hydroxyapatite. The Ca–P particles penetrate preferentially the pores inside, which improve bonding of the bioceramic layer to the metallic substrate. Increasing the cathodic deposition potential results in changes of the Ca–P morphology from thin porous, through cracked up to thick 90 μm continous coating. The porosity of the Ca–P decreases with increasing cathodic deposition potential. It is proposed the electric field enhancement mechanism of the electrolytic ions flow and Ca–P growth on the surface irregularities, such as pores and surrounding hillocks.