Corrosion And Friction Properties And Mechanism Of Polymer Composite Nano-coating In Seawater Environment

High-end equipment technologies such as modern ships and offshore platforms have developed rapidly in recent years.More and more moving structures directly used seawater as a lubricant to simplify the lubrication and sealing design of the moving mechanism and avoid water pollution caused by lubricant leakage.However,the corrosion,wear and the interaction of the materials in the seawater medium poses a serious challenge to the service life and reliability of the seawater lubrication mechanism.Due to its excellent properties such as self-lubrication,performance design and vibration and noise reduction,polymer-based nano-coatings have significant advantages in the design and preparation of water-lubricated parts,so they played an increasingly important role in anti-corrosion and tribology design of motion mechanisms.The role.People have accumulated years of research on the anti-corrosion or wear-resistant single function of polymer nano-coatings.However,there are few public reports on the anti-corrosion and wear-resistant integrated polymer nano-coatings.The research on the integration of wear-resisting and anti-corrosion of polymer nano-composite coatings is of great significance to the design and application of marine equipment motion mechanism.In this study,functionalized graphite oxide nanosheets?GO?,silicon carbide nanoparticles?Si C?,titanium dioxide nanoparticles?TiO₂?,polyaniline?PANi?,etc.were functional fillers for polymer composite coatings.The effects of different nanoparticles on the friction properties of polymer composite coatings under seawater lubrication conditions were studied.The anticorrosion properties of different polymer composite coatings in 3.5% Na Cl solution were tested.Different nanoparticle pairs were discussed.Surface analysis techniques such as SEM,TEM,FTIR,and RS are used to pass the metal surface corrosion morphology of the polymer coating and the micro/nano of the polymer coating-metal friction side surface transfer film.The structure was studied in depth,and the mechanism of the nanostructure of the transfer film and its lubricating properties under seawater lubrication conditions and the anticorrosion mechanism of the polymer coating were found.The main impurities obtained through experimental analysis are:The three fillers of GO,TiO₂ and PANi all have significant improvement on the anti-corrosion performance of the polymer coating.The incorporation of GO-IL nanosheets can significantly improve the coating's anti-corrosion properties.However,it has been found that 0.5wt% GO-IL and 0.5wt% PANi are co-doped into the coating,and the anti-corrosion performance of the polymer coating is the highest.The synergistic effect is the best,the impedance modulus reaches 1010 ?cm2;while the synergistic anticorrosive effect of 10wt% TiO₂ and 0.5wt% GO-IL combined with the coating is poor.The addition of 7.5 wt% reinforcing fiber?SCF?and 9 wt% solid lubricant?Gr?was added to the combination of 0.5 wt% GO-IL and 0.5 wt% PANi,and the corrosion protection of the polymer composite coating was found.The performance did not have a negative impact;on the basis of 0.5 wt% GO-IL and 0.5 wt% PANi,the addition of 3wt% Si C to the polymer coating reduced the corrosion resistance of the coating.Under seawater lubrication conditions,reinforcing fibers?SCF?and solid lubricants?Gr?can significantly improve the wear resistance of polymer materials;due to the shear properties and good dispersion of GO nanofillers,the friction properties and coating of friction pairs are significantly enhanced.The wear resistance of the layer;while the addition of 0.5wt% PANi and 0.5wt% GO-IL will reduce the wear resistance of the coating,but PANi has no negative effect on the friction performance of the polymer composite coating.The coatings with 7.5 wt% SCF,9 wt% Gr and 0.5 wt%GO-IL,and 0.5 wt% PANi were combined to have the best wear resistance and lubricating performance,which was one order of magnitude lower than the specific wear rate of pure epoxy.0.5wt% GO-IL/0.5wt% PAN/7.5wt% SCF/9wt% Gr/EP coating has high anti-corrosion performance and also has good wear resistance,ie anti-corrosion and wear-resistant integrated coating.At the same time,the addition of 0.5wt% GO-IL and 0.5wt% PANi coating has the best anti-corrosion effect.The main mechanism was that the good dispersion of GO-IL made the corrosion material penetration path more tortuous and PANi forms a passivation layer at the interface between the coating and the metal substrate.Synergies.The transfer film formed by the friction interface was found to be able to form a stable and uniform transfer film with lubricating properties on the surface of the friction pair,which can effectively improve the tribological properties of the polymer composite under the boundary and mixed lubrication conditions,and can inhibit the metal dual wear corrosion.