الملخص

Abstract : Bioactive coating on composite implants facilitates biological fixation between the prosthesis and the hard tissue, and increases the long-term stability and integrity of the implants. It produces an intermediate region between bone and implant. Hydroxyapatite coating Ca10 (PO4)6(OH)2 was carried out on stainless steel 321 AISI substrate by chemical method, this coating can forms strong chemical bonds with bone in vivo because it has the same mineral component of bone. The x-ray diffraction (XRD) technique were employed to investigate formed phases on the specimen surface. The coating formed is pure hydroxyapatite free from other phases like tri- or tetra calcium phosphate. Electrochemical study involving cyclic polarization experiment was carried out to assess the corrosion resistance behaviour of Hydroxyapatite coated 321 SS comparing with uncoated specimen in Ringer's solution. The results of cyclic polarization have indicated the efficiency of coated specimen which showed high stability Compared with the uncoated specimen.