Study On Corrosion Protection Performance Of Plate-like Active Filler Reinforced Coating

Metal materials are widely used in construction,transportation,industry,ocean,aviation and other fields due to their excellent physical and chemical properties.But,metal materials are susceptible to corrosion due to the influence of the surrounding environment in service.At present,coating protection is a kind of popular,effective and economical protective strategy.However,the existence of inherent pores and defects in the coating can accelerate the failure of coating,thereby limiting the application and development of coating protection technology.Therefore,how to enhance the protective performance of coatings has become a hot research topic in recent years.In this paper,the synergetic protection system was constructed through the multifunctional design of the filler,and the role of the versatility of the filler in synergetic enhancement of the protective performance of the coating was explored in depth.Firstly,partially dehydrated basic zinc sulfate microsheets was synthesized by chemical bath deposition together with subsequent heat dehydration technology,and the multifunctional synergistic protective effects of physical barrier and chemical barrier were also investigated.It turns out that the microsheets?10 wt%?embedded fluorocarbon coating still remained at high coating resistance value(R_c>10¹¹?·cm²)and low coating capacitance(C_eff<10^-10 F·cm²)after being immersed in 3.5 wt%NaCl solution for 150 d.It is not only due to the fact that the microsheets effectively extend the diffusion path of corrosive media such as water,oxygen and ions in the coating,but also to their efficient water,ion trapping and swelling properties.When the corrosive media such as water,oxygen or ions penetrates into the coating/filler interface,the microsheets can capture water and ions?Cl^-and Na⁺?in the coating matrix by means of crystal phase transformation,thereby the water and ions?Cl^-and Na⁺?,which are free to migrate in the coating matrix,are locked in their own lamellar structure,so as to impart active barrier property to coating.Secondly,strontium-8-hydroxyquinoline microsheets was synthesized by chemical bath deposition,and the multifunctional synergetic protective effect of physical barrier and self-repair of the filler was explored.The results show that the microsheets?20 wt%?can significantly improve the coating impedance of the fluorocarbon coating,and can quickly repair the coating damage.When the coating is subjected to accidental damage,the microsheets dispersed near the damaged area will dissolve and release the inhibitor ion of HQ^-,which can accelerate the formation of more stable and compact film on the surface of exposed metal substrate through active chemical etching,so as to achieve rapid self-repair of the damaged coating and protect the metal substrate from corrosion.In conclusion,the multi-functional design of the filler can effectively construct the synergistic protection system and effectively extend the service life of the coating.This strategy provides a new idea and theoretical basis for the research and development of efficient,intelligent and long-life anti-corrosion materials.