In vitro electrochemical behaviour of Chitosan-PEG coatings obtained on Ti6Al4V by dip coating

Abstract

In the present study, coatings of Chitosan - Polyethylene Glycol was obtained by dip coating on Ti6Al4V from polymer mixtures (30-70, 50-50, 70-30). The aim of our study was analysed their ability to formation of apatite and their electrochemical behaviour in the presence of a simulated physiological fluid. The coating properties were evaluated by electrochemical impedance, atomic absorption, SEM and FTIR techniques. The results showed that surfaces coated with a 50-50 ratio of chitosan PEG stimulate the formation of calcium phosphates on the surface of the material. On the other hand, it was found that the number of layers generate a very significant effect on the resistance to the degradation of the alloy in the presence of SBF, generating an increase of up to 1 and 3 orders of magnitude in the impedance of the coating of 5 and 7 layers respectively compared to the Ti6Al4V alloy.