| The ubiquitous metal corrosion has caused enormous economic costs and damage to modern industrial societies and even posed a serious threat to human health and the environment.The traditional anticorrosive paints are not long-lasting due to the easy permeation of corrosive ions to the coating/metal interface.Recently superamphiphobic（super-repellent）surfaces are arousing increasing interest owing to their wide range of industrial applications,such as self-cleaning,anti-icing,and anticorrosion.In this paper,based on the wettability of material surface and the biomimetic principle,we prepared new coatings with epoxy resin and fluoropolymer as basal,introduced nanoparticles to build hierarchical rough structure,employed low surface energy materials to improve the coating superamphiphobicity and combined electroactive polyaniline to enhance the coating anticorrosion property.It is believed that this research will pave a new simple spraying way to design the multifunctional coatings for anticorrosion applications especially under mechanically erosive/abrasive environment.The main contents can be summarized as the following:（1）Superamphiphobic and electroactive composite coating on aluminum substrate was successfully fabricated by integrating epoxy（EP）,polyaniline（PANI）,fluorinated ethylene propylene（FEP）,carbon nanotubes（CNTs）and SiO2 nanoparticles into a two-layer coating configuration with nano/micro hierarchical surface structure.The composite coating with 4.5wt% PANI possesses superamphiphobic property,with contact angles of 157° and 154°toward water and glycerol,respectively.The composite coating demonstrates strong adhesion（grade 1 according to the GB/T 9286）and the WCA can be maintianed 149° after 10000 times abrasion.The electrochemical tests demonstrates significantly enhanced anticorrosion performance by surface barrier effect of the superamphiphobic coating and redox catalytic capability of embedded electroactive PANI.The multifunctional coatings will promise a wider engineering applications in petroleum related industries.（2）Core-shell structured polyaniline/functionalized carbon nanotubes（PANI/fCNTs）composite and nanosized silica were synergistically integrated into ethylene tetrafluoroethylene（ETFE）matrix to construct lotus-leaf-like structures,and 1H,1H,2H,2Hperfluorooctyltriethoxysilane（POTS）was used to decrease the surface energy.The compositecoating with 6 wt% PANI/fCNTs possesses superamphiphobic property,with contact angles of 167°,163°,and 159° toward water,glycerol,and ethylene glycol,respectively.This coating demonstrates stable nonwetting performance over a wide temperature range（<400 °C）,as well as outstanding self-cleaning ability to prevent contamination by sludge,concentrated H2SO4,and ethylene glycol.Superamphiphobic surface property can be maintained even after45000 times abrasion or bending test for 30 times.The coating displays strong adhesive ability（grade 1 according to the GB/T9286）on the etched aluminum plate.It should be noted that this coating reveals significantly improved anticorrosion performance as compared to the bare ETFE coating and ETFE composite coating without PANI/fCNTs,remains extremely lower corrosion rate（0.004 μm/year）and higher protection performance（99.997%）after 90 d immersion 3.5 wt% NaCl solutions.（3）Al2O3 nanoparticles were chemically grafted onto montmorillonite（MMT）nanosheets via coupling effect of NH2-C3H6-Si（OC2H5）3（KH-550）and modified by low surface energy material polydimethylsiloxane（PDMS）.The Al2O3/MMT-PDMS nanocomposite and POTS were embedded into ETFE matrix to develop well-designed nano/micro structure and decrease the surface energy,respectively.The composite coating with 25 wt% MMT/Al2O3-PDMS possesses superamphiphobicity with high contact angles towards water（164°）,glycerol（158°）and ethylene glycol（155°）.This coating demonstrates outstanding self-cleaning ability to prevent contamination from graphite powder and strong adhesive ability（grade 1 according to the GB/T9286）on the etched aluminum substrate.The superhydrophobicity can be maintained after 8000 times abrasion under 100 kPa or annealing treatment for 2 h under 350 °C.It should be noted that this superamphiphobic coating reveals excellent long-term corrosion protection with extremely lower corrosion rate（4.3×10-3μm/year）and higher protection performance（99.999%）after 30 d immersion 3.5 wt% NaCl solutions based on a series of standard electrochemical corrosion measurements. |
