THE EFFECT OF A COMPOSITE CHITOSAN-SILVER(I) ION COATING ON THE CORROSION RESISTANCE OF THE COBALT-CHROMIUM-MOLYBDENUM ALLOY IN SALINE SOLUTION

We determined the in vitro corrosion resistance of the composite chitosan-silver(I) [Ag(I)] ion coating on the cobalt-chromium-molybdenum (CoCrMo) dental alloy in a 0.9% sodium chloride (NaCl) solution at 37 degrees C. We obtained the novel composite chitosan-Ag(I) ion coating by electrophoretic deposition at 20 V for 30 s at room temperature in a 2% (v/ v) aqueous solution of acetic acid with 1 g dm-3 chitosan and 10 g dm(-3) silver nitrate. We evaluated the chemical composition with energy dispersive spectroscopy and Fourier-transform infrared spectroscopy. We investigated surface topography and electronic properties with a scanning Kelvin probe. We determined the mechanism and kinetics of the electrochemical corrosion of the obtained coatings by electrochemical impedance spectroscopy. The Ag content in the composite chitosan-Ag(I) ion coating was 1.9 +/- 1 wt.%. The cataphoretic co-deposition of chitosan and Ag(I) ions in an aqueous solution can be used to modify the CoCrMo alloy surface to obtain new coatings with antibacterial properties.