表面技术2025，Vol.54Issue(4)：110-121,12.DOI:10.16490/j.cnki.issn.1001-3660.2025.04.008
仿生多巴胺原位聚合改性氟化石墨烯对水性环氧树脂涂层耐腐蚀性能的影响
Effects of Biomimetic Dopamine In Situ Polymerization Modified Fluorinated Graphenee on Corrosion Resistance of Waterborne Epoxy Resin Coatings
摘要
Abstract
Fluorinated graphene,a novel member of the graphene family,retains the characteristic two-dimensional layered structure of graphene and exhibits distinctive properties such as hydrophobicity,wear resistance,and electrical insulation.These attributes make it an excellent candidate for enhancing the corrosion and wear resistance of organic coatings.However,improving its dispersibility within resin matrices poses a significant challenge,given that fluorinated graphene often exhibits poor dispersion and a propensity to agglomerate and stack in organic matrices.Achieving a uniform and stable dispersion is crucial for maximizing its anticorrosion effectiveness. Inspired by the adhesion mechanisms of mussel proteins,the dopamine has been leveraged as a modifying monomer to initiate in situ polymerization,successfully yielding polydopamine(PDA)nanoparticles on the surface of fluorinated graphene flakes.By this innovative approach,a polydopamine-modified fluorinated graphene(FG@PDA)composite material has been prepared,significantly enhancing the dispersibility and consequently boosting the corrosion resistance of coatings. The chemical composition,crystal structure,and micromorphology of FG@PDA were characterized with a range of analytical techniques,including Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),and high-resolution scanning electron microscopy(SEM).The FG@PDA/WEP composite coatings were formulated by incorporating FG@PDA as a nanofiller into aqueous waterborne epoxy resin(WEP).The dispersion of FG@PDA within the coatings was assessed with scanning electron microscopy.The anticorrosion performance of the composite coatings was evaluated through polarization curves(Tafel),electrochemical impedance spectroscopy(EIS)and neutral salt spray test(NSST)supplemented by an analysis of the underlying corrosion protection mechanisms. The results showed that dopamine molecules uniformly adhered to the surface of fluorinated graphene flakes,forming polydopamine(PDA)nanoparticles through self-polymerization.The presence of oxygen functional groups,such as catechol,amine,and imine,on the surface of FG@PDA interacted with the epoxy groups of the epoxy resin,thereby enhancing its dispersibility.Following a 10-day immersion test,the corrosion current density(Jcorr)of the FG@PDA/WEP composite coatings,with the incorporation of 0.5wt.%-1wt.%FG@PDA,was reduced by nearly two orders of magnitude compared to that of the unmodified WEP coatings.Notably,the coating with 1.0wt.%FG@PDA exhibited the lowest Jcorr,amounting to 5.80×10-10 A/cm2.Furthermore,the low-frequency impedance modulus(|Z|0.01 Hz)of the FG@PDA/WEP composite coatings,as determined by EIS,consistently remained above 108 Ω·cm2,significantly exceeding that of the unmodified WEP coatings.This highlighted the superior anticorrosion performance of the composite material. The significant enhancement in performance is primarily attributed to the strong adsorption of dopamine molecules(DA)onto the surface of fluorinated graphene through π-π stacking,which is followed by the formation of polydopamine(PDA)nanoparticles via self-polymerization.This process effectively prevents the aggregation of fluorinated graphene flakes.Moreover,the PDA layer,enriched with oxygen functional groups such as catechol,amine and imine,interacts with the epoxy groups of the epoxy resin.This interaction significantly enhances the interfacial compatibility between FG@PDA and the resin matrix,thereby increasing the coating density and impeding the penetration of corrosive agents.It also complicates their diffusion pathways and substantially extends the protective lifespan of coatings.关键词
聚多巴胺/氟化石墨烯/分散/水性环氧涂层/防腐Key words
polydopamine/fluorinated graphene/dispersibility/waterborne epoxy coating/corrosion resistance分类
矿业与冶金引用本文复制引用
朱建康,李茂东,王良旺,张双红,翟伟,李爽,熊磊,王维科..仿生多巴胺原位聚合改性氟化石墨烯对水性环氧树脂涂层耐腐蚀性能的影响[J].表面技术,2025,54(4):110-121,12.基金项目
国家市场监督管理总局科技计划项目(2023MK147) （2023MK147）
广东省市场监督管理局科技项目(2021CT05,2022CT08) （2021CT05,2022CT08）
广州市市场监督管理局科技项目(2023KJ11,2024KJ23,2024KJ16) National Market Supervision Administration Science and Technolog Project(2023MK147) （2023KJ11,2024KJ23,2024KJ16）
Guangdong Provincial Market Supervision Administration Science and Technology Project(2021CT05,2022CT08) （2021CT05,2022CT08）
Guangzhou Municipal Market Supervision Administration Science and Technology Project(2023KJ11,2024KJ23,2024KJ16) （2023KJ11,2024KJ23,2024KJ16）
