Study the variation of surface topography & corrosion resistance of Cr-GO nanocomposite coatings by addition of GO nanoparticles
Delaram Mahmoudi, Arvin Taghizadeh Tabrizi, Hossein Aghajani
Abstract
Abstract The chromium-graphene oxide nanocomposite coating was synthesized successfully by the electroplating method in this investigation. The influence of the addition of GO on surface topography, microhardness and the corrosion behavior of chromium coatings was studied by polarization and electrochemical impedance microscopy methods. The maximum surface microhardness value was measured at a sample with 10 wt% of GO particle equals to 766 HV. The results of surface analysis (Atomic Force Microscopy and microhardness) reveals that the combination of two main factors of GO particle addition and coating thickness has more effect on the surface microhardness than the grain size of topographies. Corrosion results show the addition of the GO particles reduces the corrosion resistance of chromium coating but layer with 5 wt% of GO particles has better corrosion resistance than other composite coatings. Also, results show that corrosion resistance has a meaningful relationship with Sa/Sp ratio.