CHARACTERIZATION OF ELECTROLYTICALLY DEPOSITED CALCIUM PHOSPHATES

Abstract

Electrolytic calcium phosphate depositions on stainless steel were carried out by electrolyzing 0.21 mol/dm³ Ca (H₂PO₄)₂. H₂O solutions added with and without NaNO₃ at a cathode current of mainly 6mA/cm² at 20-90°C. CaHPO₄ 2H₂ O formed below 30±5°C and CaHPO₄ above the temperature. Both plate-like crystals were deposited nearly parallel to the stainless steel cathode face, and changed to fine grains with increasing current. By further increasing current or decreasing calcium phosphate concentration the formation of apatite became possible.