Preparation of hydroxyapatite coating by the use of a sacrificial Mg anode method

A sacrificial anode method was introduced into the preparation process of a hydroxyapatite (HAP) coating on a Ti alloy (TAMZ) surface. Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were applied to characterize the coatings. A CaHPO4radical dot2H2O layer formed on TAMZ at the initial stage, and later it was transformed into HAP through a steam treatment. According to SEM, the HAP coating was composed of needle-like, feather-like and sheet-like crystals.