Calcium phosphate coating on titanium induced by phosphating

The phosphatization has been used in anti-corrosion treatment for metals for many years. In this work, the calcium phosphate ceramic coatings (Ca-P coatings) based on titanium were prepared by phosphating titanium and then soaking in a supersaturated calcium phosphate solution. The effect of phosphatization of titanium on the formation of Ca-P coating was investigated. The analysis with a scanning electron microscopy showed microporous surfaces of titanium after phosphatization. The spectra of X-ray photoelectron spectroscopy indicated that the surfaces contained PO43-, HPO42- and H2PO-. The induced couple plasma atomic emission spectroscopy suggested that precipitation of P be prior to Ca during immersion in the supersaturated calcium phosphate solution.