DEPOSITION OF CALCIUM-PHOSPHATE ON TITANIUM BY ELECTROCHEMICAL PROCESS IN SIMULATED BODY-FLUID

Calcium phosphate coatings were produced by an electrochemical process in a simulated body fluid. Granular precipitates were formed on the w orking electrode after loading a cathodic potential. The products were amorphous calcium phosphates containing magnesium, of which the compo sition was nearly the same as calcium-deficient carbonate apatites suc h as biological apatite. The amount of calcium and magnesium deposited on the electrode increased in direct proportion to the square root of loading time of cathodic potential. The diffusion process of ions aro und the cathode was found to be a rate-determining step in the electro chemical process of forming calcium phosphate.