Figure presents the corresponding OCP and Tafel curves for all the coated substrates including bare steel. In addition, Table shows the parameters of the corrosion rates (CR), the corrosion inhibition efficiency (η), the polarization resistance (R p ) as well the OCP, corrosion current density (I corr ), corrosion potential (E corr ), which were derived from the analysis of Tafel curves. According to Figure , the OCP values for the CMMC-coated samples (including Cu Ref ) are shifted towards more positive potentials compared to the Nicoated and bare steel samples. Similar behaviour is recorded from the potentiodynamic polarization curves (Figure ) for the E corr . Such a shift implements the tendency of the coated samples to be more stable in the corrosive environment. In addition, all coated samples show a decrease in I corr compared to bare substrate, with the largest decrease occurring for FGO-CMMCs. Due to this, FGO-CMMC exhibits the lowest corrosion rate of 1.9 μm yr -1 , reaching the highest protection efficiency of 94.2 %. Importantly, GO-CMMC also exhibits low CR, which is more than 2 times lower compared to Cu Ref and Ni cases, indicating the anti-corrosion potential of CMMC coatings.