Dispersibility of graphene in polymeric medium is the biggest challenge for coating formulator. A diverse research work is undertaken by many researchers to modify the graphene and its allotropes to alter the surface nature, so that it will boost the dispersibility of graphene particles in resin medium. Chang Peng et al. found diazonium compounds suitable for modification of graphene. Modification made by reacting with diazonium compounds considerably improved its dispersibility by successfully preventing reunion of graphene nanoparticles. For the first time, Author has employed phenyl carboxylic functionalized graphene and reacted it with phthalocyanine. The Author also revealed that dispersibility of graphene molecules is also improved as a result of functionalization of graphene particle . The graphene can be chemically modified by self-reducing at high temperature. Author has made a coating by varying the concentration graphene from 1 to 10% in resin medium. The prepared coating is further modified by adding a corrosion inhibitor as ferric nitrate. Well prepared coating is applied on carbon steel and evaluated for various performance properties using electron scanning microscopy (SEM), 3% NaCl solution. Author established the relation of noise and modules of impedance as the functions of chemically modified graphene and its concentration in coating . Seungwoo Son et al. developed a unique process to deposit monolayer of zinc oxide on graphene particles. The graphene like structure of the zinc oxide monolayer is deposited by the spontaneous redox reaction. The ultra-thin layer of zinc metal is directly deposited on graphene oxide particles. This deposition involved spontaneous redox reaction. The deposited thin layer is a two dimensional hetero-structure of graphene oxide and zinc oxide. Oxygen required to carry out necessary oxidation of zinc metal and its deposition is supplied from graphene oxide . M. Rajabi et al. prepared several coating compositions by varying the concentration of graphene in epoxy resin medium. The prepared coatings were evaluated with the help of electrochemical analysis. These analysis reveals that best corrosion resistance can be obtained by graphene concentration of 0.25% . Youtong Wu et al. prepared zinc phosphategraphene oxide hybrid compound to increase the zinc phosphate system's corrosion resistance. This research mainly conducted to study effect of graphene oxide, its concentration in coating composition against the corrosion protection of metal. This hybrid material is prepared using a one-step ultrasonic precipitation method. The prepared material were evaluated for its performance using several instruments such as transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy(SEM), X-ray diffraction (XRD), etc. . The deposition of graphene oxide-zinc phosphate is ensured with SEM images as shown in Fig . Qingsong Zhu et al. developed a coating formulation using zinc phosphate and functionalized graphene (ZGP). Graphene used here was modified with polypyrrole (PPy). This research mainly conducted to modify the surface nature graphene thereby improving its dispersibility in resin medium. This modification is carried out in situ on the surface of graphene. On revealing the data of electron impedance spectroscopy, the author confirms the functionalized graphene performed very well against the corrosion and this happened due to much complex lattice formed in the path of corrosive media . For modifying the properties of graphene against erosion and abrasion, the author have developed a coating comprises reduced graphene oxide and di-atomaceous earth modified with poly-dimethyl-siloxane. Super-hydrophobicity of the coating is further improved by addition of nano TiO2 particles in coating composition . A water based coating is prepared by M. Ajay Krishnan, et al. for copper surface. This research carried out by exfoliation of micro-graphite and graphene nanoparticles. Graphene synthesis herewith further modified with 3-amino propyl-tri-ethoxy-silane to insure the formation of covalent bonding with copper surface. Corrosion resistance of coating is tested using 3.5 % solution of NaCl salt. Author also reveals that use of 4% graphene (wt. basis) reduces the corrosion current by almost 20 % which results in dramatic protection of copper metal from the corrosion Yanjun Ma and his co researchers were inspired by the outstanding performance of the graphene coating and developed the coating based on functionalized graphene and PU acrylate. Prepared coating film is cured by using UV rays. This modification of graphene improved dispersibility of graphene in resin medium. Graphene nano-particles present in coating forms more dense structure of coating on curing, thus, porosity of the coating is reduced to great level. Formed dense structure of coating, improves the barrier properties of coating and enhance anti-corrosive properties of coating. Long-Cheng Tang and his co-researcher prepared a dispersion using graphene nano-particles. This research is carried out to study the effect of dispersion of graphene on the mechanical properties of coating. Dispersion of graphene nano-particles in epoxy resin medium is carried out in a ball mill. Applied shear stress is controlled by using balls of different diameters like 3, 6, 11 mm. After conducting several experiments and analysis of the prepared sample, the author observed that coating with high strength and high toughness is obtained with highly dispersed graphene-epoxy composite . Graphene were functionalized using 3-aminopropyl triethoxysilane (APTS). This hybrid of graphene with APTS greatly improved the dispersibility of graphene in the resin medium. Silane modification also facilitates better interfacial interactions in resin medium and graphene nano-particles. The reaction mechanism of graphene modification with APTS is best explained in Fig . L. Cao et al. reacted epoxy resin with renewable material like gallic acid. This bio-based modified resin medium is capable to get absorbed on graphene surface. Result also reveals that this modification also improved the properties like excellent thermal conductivity, electrical conductivity, mechanical properties etc. . To get the best performance of graphene based coating, it is mandatory to get graphene nanoparticles dispersed properly in resin solution. Sepideh Pourhashem et al. developed a solvent based coating using epoxy resin. Results of experiments reveals that barrier properties of graphene particles are improved to great extent and coating performance against the corrosion also amended to great level. Dispersibility of graphene particles were improved by modifying it with poly-etheramine. Author reveals that modification of graphene with ploy-etheramine improves the wettability of graphene nano particles in resin medium. This happened due to increase in interfacial interaction between epoxy resin solution and graphene nano particles . The Modification of graphene with 3amino-propyl tri-ethoxy-silane and 3-glysidyloxy-propyl tri-methoxy-silane also attempted to improve its dispersibility. Author also found the surface modification of graphene with silane compounds, improved the adhesion of epoxy base coating. This modification also improved the contact angle of coating which significantly helped to accelerate corrosion resistance of prepared coating . Saurav Ramesh Nayak et al. modified graphene surface by reacting it with 4nitroaniline. The coating was prepared using these functionalized nano graphene particles and epoxy resin as binder for coating. Corrosion resistance of the coating composition is checked on MS panels. Electron impedance spectroscopy (EIS) and potentio-dynamic studies are used to determine the corrosion resistance of coating. Experiment outcomes reveals that modification of result successfully upgraded the corrosion resistant properties of prepared coating matrix . The corrosion performance of lysine modified graphene particles is also evaluated using a 3.5 % NaCl salt spray test. After exposure to 500 hrs to salt spray solution the performance of the coating against corrosion are reveal from the Fig ; The effect of graphene and its concentration is examined by Patricia Azuka Okafor et al. Several coating compositions were prepared by varying concentration of graphene nano-particles. Homogenous coating is made using hybrid polymer as epoxy-ester-siloxane-urea. Author established a correlation between polarization resistance and mechanical behaviour of coatings . Unique study was made by G. Christopher et al. For the first time, the author and his co-worker compared the performance of the carbon black and graphene oxide for its performance against the corrosion. The prepared coating comprises water borne polyvinyl alcohol modified polyurethane resin, carbon black/ZnO (CB/ZnO) and modified GO/zinc oxide (GO/ZnO). The surface tension of the coating is measured with the help of angle of contact.