Electrochemical corrosion of Ti6Al4V, Ti and AISI 316L SS after immersed in concentrated simulated body fluid

Abstract

The biomimetic method is used to obtain hydroxyapatite (HAP) coatings on Ti6Al4V, Ti and AISI 316L SS substrates. These substrates with different pretreatment surface operations (HNO 3 , anodic polarization, base-acid) were immersed in concentrated simulated body fluids (SBF) for different days at physiologic conditions of 37°C, initial pH of 7.4. Then the corrosion behaviours of substrates after immersion in concentrated SBF were examined by electrochemical methods in Ringer's and 0.9 wt% NaCl solutions at a temperature of 37°C. Ions concentrations and pH analyses were carried out after incubation in concentrated SBF. After immersion in SBF for different days, the surface morphology remains almost unchanged and no apatite formation is observed. Corrosion currents of substrates increased after immersion. Ions concentrations and pH values were shown variability according to soaking time and pretreatment surface operations.

Corrosion Behavior of Cathodic Electrodeposition Coatings on Micro-Arc Oxidized Titanium Alloy in Simulated Body Fluid

“…The two curves represented the bare Ti alloy and MAO substrate are included in this figure . It can be determined that the OCP of Ti alloy exhibits a continuously downward trend, which may be ascribed to a slight dissolution of Ti alloy in SBF. 48 For the MAO substrate, the OCP decreases rapidly in the early stage of immersion, and then declined more slowly. The rapid decrease of OCP may be related to the process of electric potential stabilization due to the porous surface of MAO layer.…”