Co-Deposition of HA/TiO2 Over Electrolytic Plasma Nitrocarburised 316L Stainless Steel and Study of Corrosion Behavior of Treated Steel

Titanium dioxide and Hydroxyapatite were simultaneously added to plasma electrolyte nitrocarburizing bath of 316L stainless steel in order to improve the corrosion behavior of steel. Then the samples were placed in the electrolyte and biased with a negative voltage of 145 volt. Cross section and surface morphology were studied using a scanning electron microscope (SEM). The results of EDX and XRD analysis reveal the presence of Titanium، Calcium، Phosphorus، Nitrogen and Carbon. Corrosion behavior of the coating was investigated by tafel polarization tests in Ringer solution. The composite coating exhibits an improvement in corrosion behavior.