pH Distribution Around the Electrode During Electrochemical Deposition Process for Producing Bioactive Apatite

The pH distribution of an electrolyte around a cathode during the electrochemical deposition of calcium phosphate was examined using a pH imaging microscope and discussed from an electrochemical point of view. From the plot of the weight gain due to the deposits against square root of the loading time, the critical time for deposition was determined at four levels of current densities. OH - concentration around the cathode during the electrochemical deposition was found to be pH 9.6 using the Sand equation on the basis of the critical time and other constants. The pH distribution around the cathode was quite different for the electrolytes with and without pH buffer.