Construction And Corrosion Resistance Of Superhydrophobic Surface Based On Metals

Today,with the rapid development of the national economy,the development and utilization of marine resources is of great strategic significance for the development of coastal economies.However,the phenomenon of metal corrosion existing in the marine environment is becoming more and more serious,and the traditional methods of anti-corrosion of metal materials are facing severe challenges.Therefore,it is of great significance to adopt appropriate anti-corrosion methods to slow down the corrosion of metals in the marine environment.Scientific research proves that superhydrophobic membrane technology has broad application prospects in metal surface anti-corrosion work.Inspired by the super-adhesive ability of marine mussels to secrete dopamine,this paper mainly uses polydopamine functional modification method to successfully construct superhydrophobic structure on the surface of metallic zinc material and super ferritic stainless steel B44660 and study it in the marine environment.Corrosion resistance.The experiment firstly optimizes the experimental conditions of the formation process of polydopamine film: roughness,temperature,etc.,and combines a new method of UV-zone technology to improve the bonding force between the film and the substrate,provides a stable basis for low surface energy modification of the material surface.In this paper,the superhydrophobic structure on the surface of the material was constructed by the combination of dopamine self-polymerization and the addition reaction with low surface energy materials.Two low surface energy materials were used to modify octadecylamine(ODA)and 1H,1H,2H,2H-perfluorodecanethiol(PFDT).According to the optimized conditions,successfully constructed a stable superhydrophobic structure.Meanwhile,compared and selected the superiority of aminated polydopamine film and fluorinated polydopamine film.Secondly,in order to consider the corrosion resistance of the superhydrophobic structure on the surface of the material,using electrochemical test(Polarization curve and electrochemical impedance spectroscopy)analysis,common immersion experiments,microscopic morphology analysis,anti-marine organism adhesion fouling performance research,adding corrosion inhibitors and water mist condensation experiments,combined WCA measurement,analysis the corrosion resistance of aminated polydopamine film and fluorinated polydopamine film on the surface of zinc and B44660.The results show that the surface of Zn/PDA/PFDT and Zn/PDA/ODA composite film on zinc material is stable and can reach superhydrophobic state.The surface of B44660 is Fe/PDA/PFDT and Fe/PDA/ODA.The film structure is stable,but Fe/PDA/PFDT is superhydrophobic,while Fe/PDA/ODA does not reach superhydrophobic state.Moreover,the hydrophobicity and corrosion resistance of the superhydrophobic films obtained by modifying the low surface energy modifiers of PFDT on both metal-based surfaces are better than ODA.At the same time,the addition of different concentrations of vitamin E inhibitor((+)-?-Tocopherol)in PFDT/ethanol solution can improve the corrosion resistance of metal-based/PDA/PFDT in 3.5wt.% Na Cl aqueous solution.Corrosion mechanism analysis shows that its excellent corrosion resistance is due to the existence of “micro-nano air valley” structure in the superhydrophobic structure on the surface of the material.The principle is that under the joint action of its micro-nano structure and low surface energy substances,the solid-liquid contact interface on the surface of the material retains a layer of “air valley”.This layer of "air valley" greatly hinders the separation of the diffusion and migration of strongly corrosive chloride ions between the solution and the solid interface.Corrosive media generally do not penetrate this layer of "air valley" to react with the metal substrate to make it have good corrosion resistance.The research in this paper can provide reference for improving the corrosion resistance of metal materials in the marine environment,and provide scientific basis for marine antiseptic work.