Abstract
Morphology and corrosion properties of electrodeposited iron manganese-graphene oxide (FeMn-GO) composite coatings was investigated as a function of the GO content. The composite coatings exhibited uniform and compact morphology for lower concentrations of GO in the coating. For higher GO concentrations, agglomeration of GO in the electrolyte bath resulted in non-uniform coating morphology with large surface defects. The influence of GO concentration and coating morphology on the corrosion properties of the coatings was studied by Tafel polarization and electrochemical impedance spectroscopic (EIS) techniques. The impermeability of GO to the corrosive media enhanced the corrosion properties of the composite coatings, with respect to pristine FeMn coating, up to the optimum GO concentration, after which the corrosion resistance behaviour of the composite coatings degraded due to defects and micro-pores present on the surface of the coatings.
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