| Based on the practical requirements of anti-pollution,anti-corrosive and anti-micro-crack propagation of protective coatings,the paper first put forward the innovative ideas of“micro-structure design and self-repairing mechanism of bionic nanocomposite coatings for bridge steel members”.(1)The nanoparticles Zn O?Ti O2?Al2O3(whiskers)were blended with epoxy coatings and pre-treated with multicomponent surfactant BS-12?SDBS to avoid the phenomenon of“agglomeration”.the“fluff”and“wax”of lotus leaf mastoid were imitated by multi-scale,multi-dimensional and multi-grade system to enhance the rolling self-cleaning and decontamination ability of lotus leaf.The experimental results show that the self-cleaning performance is excellent,the corrosion rate is one order of magnitude lower than that of the original coating,and the fitting impedance mode value is about twice that of the ordinary nanocomposite epoxy coating.(2)The“gecko imitation”design was carried out with magnetic?-Fe2O3,and BS-12,blend epoxy resin coating with surfactant.Test results of mechanical properties indicate that the bond strength is increased by21%,and the anti-stripping ability and deformation synergy are improved simultaneously.(3)The self-repairing function is realized by using the reversible double bond,which is unique to chiral molecular structure,so that when the crack is formed,the double bond can be opened and bridged spontaneously,and the micro-crack can be self-repaired by using the quasi-fluid characteristic of small-scale nanoparticles.The results show that the self-cleaning and corrosion resistance of nano-self-repair coatings are better than that of ordinary nano-reply coatings.immersed in 5%saline,the repair rate was about 70%after 24 h,and 84% after 48 h,which intuitively verified its self-repair function. |
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