Study On Graphene Improved Electrostatic Conductive And Anticorrosive Composite Coating

With the advancement of science and technology,Electrostatic anti-corrosion coating is developing a kind of functional coating,It requires both static conductivity and anti-corrosion performance,and it is widely used in many fields such as marine ships,petrochemical aerospace,electronic appliances and so on.However,the current anti-static anti-corrosive coatings in my country still have problems such as poor conductivity and anti-corrosion compatibility,high cost,and comprehensive performance is not ideal.Hence researching and improving its comprehensive performance is the key to develop such coatings technology.Graphene is a new type of nanomaterials with many special functions developed in recent years.Its excellent performance in electrical conductivity and anti-corrosion provides a new technical approach and direction for the development of new anti-static anti-corrosive coatings.Based on the above technical requirements,this paper focuses on the modification of coatings based on graphene,researches and prepares different types of static conductive anticorrosive epoxy composite coatings,and comprehensively uses macro and micro technical methods to modify the static conductive and Corrosion,mechanics and other properties have been comprehensively tested and characterized.The specific research contents and results are as follows:1.ATO epoxy composite coating was prepared using tin-antimony oxide(ATO),which mainly studied the effect of different content of antimony tin oxide on the electrostatic conductivity,mechanical and corrosion protection performance.The comprehensive performance test results show that the surface resistivity of the EP/ATO(15.4wt%)composite coating is reduced by 4-5 orders of magnitude compared with the EP/ATO coating of the same system,and it has good electrostatic conductivity and mechanical properties.At the same time,the corrosion resistance of the EP coating has been significantly improved.The results of the electrochemical impedance spectroscopy(EIS)test immersed in the 3.5 wt%NaCl solution for different times show that after 1 day of immersion,the low-frequency impedance value of the EP/ATO coating reaches 1.28 × 109 ?·cm2.After 80 days of immersion,it can still be maintained at above 107 ?· cm2,it shows good anti-corrosion performance.The improvement of the coating in terms of the above performance is due to the ATO sheet shape and the directional arrangement in the coating,forming a complete conductive network,effectively improving the physical shielding effect and electrostatic conductivity of the coating,and effectively inhibits the penetration and diffusion of corrosive substances into the coating.2.Graphene modified epoxy static conductive anticorrosive coating(EP/ATO/rGO)is prepared by adding graphene in order to improve the corrosion resistance,static conductivity and mechanical properties of the EP/ATO coating.The test results show that the corrosion resistance and electrostatic conductivity of the EP/ATO/rGO(0.3wt%)coating are better than similar systems of EP/ATO/rGO coating,and the surface resistivity reaches 2.0×106 ? cm.At the same time,the low-frequency impedalce value reached 4.53×108 ?·cm2 after 1 day of immersion,and the low-frequency impedance value remained stable at 9.8×107 ?·cm2 after 144 days of immersion.In addition,the adhesion and micro-morphology characterization test results show that the addition of rGO increases the adhesion of the coating.This is attributed to the effective physical shielding effect of rGO in the epoxy coating system,which gives the coating long-lasting corrosion resistance and it can also play an electrical connection role to improve the electrostatic conductivity of the coating.3.In order to further improve the electrostatic conductivity and anti-corrosion performance of the coating,the EP/ATO-SPANI,EP/ATO-SPANI-rGO doped epoxy coatings were prepared by comprehensively using the advantages of ATO,rGO,and SPANI.Compared with EP/ATO,EP/ATO-SPANI coating,EP/ATO-SPANI-rGO epoxy coating has good static conductivity,and it has the highest low-frequency impedance value(1.27 ×1010 ?·cm2).Even after soaking for 28 days,the low-frequency impedance value is still stable at 3.43 × 108 ?·cm2,indicating the best anti-corrosion effect.This is mainly because SPANI-rGO can effectively inhibit the penetration behavior of corrosive media.At the same time,the electrical activity of SPANI nanomaterials is used to further improve the corrosion protection performance of the coating,and the SPANI-rGO's pore suppression and physical shielding effects are exerted.