Electrodeposition of biomedical hydroxyapatite coatings on titanium alloy substrate
This work concerns the electrodeposition of highly pure brushite (CaHPO4Ö2H2O) on titanium alloy substrates and the transformation of the brushite to hydroxyapatite (HAp) Ca10(PO4)6(OH)2 as a coating for orthopaedic implants. Thus, the electrodeposition of electrolyte containing calcium nitrate and ammonium hydrogen phosphate was carried out. The influences of the substrate surface treatment, the electroplating conditions (bath composition, current density, pH value and temperature) and the hydrothermal post treatment conditions on the deposition rate, the throwing power, the adhesion, the morphology and the structure of the coating were evaluated. High adhesion bond strength (around 23?mPa) was achieved on a rough clean substrate, which is slightly higher than plasma sprayed HAp coating on titanium alloy.
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