Influence of EDTA-2Na on the hydroxyapatite coating deposited by hydrothermal-electrochemical method on Ti6Al4V surface

Abstract

The influences of the Ethylenediamine Tetraacetic Acid Disodium salt (EDTA-2Na) on the hydroxyapatite (HA) coating deposited by hydrothermal-electrochemical methods on the Ti6Al4V surface were investigated. The morphology of the HA crystals of the first layer changed from needle- or rod-like to flowerlike. The HA crystal became wider and the first layer became denser gradually, whereas the second layer became sparser. The thickness of the HA coating gradually decreased with the increase of EDTA-2Na concentration in the electrolyte. The bonding strength between coating and substrate reached the maximum of 16.8 MPa when the EDTA-2Na concentration was 7.5 × 10−4 mol/L. Cell-culture test indicated that the HA coating with 7.5 × 10−4 mol/L EDTA-2Na benefits the adhesion of cell onto the HA surface.