Abstract
Calcium phosphate coatings were produced by an electrochemical process in a simulated body fluid. Granular precipitates were formed on the working electrode after loading a cathodic potential. The products were amorphous calcium phosphates containing magnesium, of which the composition was nearly the same as calcium-deficient carbonate apatites such 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 around the cathode was found to be a rate-determining step in the electrochemical process of forming calcium phosphate.