CAJ | 학술논문

通过物理混合将自制的石墨烯分散液与双组分水性环氧树脂制备成石墨烯环氧树脂。用扫描电镜(SEM)考察了石墨烯在水溶液中的分散情况。通过极化曲线、交流阻抗谱和中性盐雾试验探讨了含0.5%石墨烯的E44水性环氧涂层(0.5%G-E44)在模拟海水溶液中的隔水和耐腐蚀性能并与纯环氧涂层 E44进行比较。结果表明：石墨烯在水溶液中分散良好，其在水性环氧树脂中层层叠加，形成了致密的物理隔绝层，减缓了水分子在涂层中的扩散速率，拥有较好的隔水性能。E44和0.5%G-E44涂层在浸泡初期的Fick扩散系数分别为5.56×10?9 cm2/s和1.61×10?11 cm2/s。添加石墨烯明显提高了水性环氧树脂涂层的防护效果，自腐蚀电流密度减小，涂层电阻和电荷转移电阻增大，200 h中性盐雾试验后涂膜平整，无明显腐蚀。
통과물리혼합장자제적석묵희분산액여쌍조분수성배양수지제비성석묵희배양수지。용소묘전경(SEM)고찰료석묵희재수용액중적분산정황。통과겁화곡선、교류조항보화중성염무시험탐토료함0.5%석묵희적E44수성배양도층(0.5%G-E44)재모의해수용액중적격수화내부식성능병여순배양도층 E44진행비교。결과표명：석묵희재수용액중분산량호，기재수성배양수지중층층첩가，형성료치밀적물리격절층，감완료수분자재도층중적확산속솔，옹유교호적격수성능。E44화0.5%G-E44도층재침포초기적Fick확산계수분별위5.56×10?9 cm2/s화1.61×10?11 cm2/s。첨가석묵희명현제고료수성배양수지도층적방호효과，자부식전류밀도감소，도층전조화전하전이전조증대，200 h중성염무시험후도막평정，무명현부식。
A graphene–epoxy resin was prepared by physical blending home-made aqueous dispersion of graphene and two-component waterborne epoxy resin. The dispersed graphene in aqueous solution was analyzed by scanning electron microscopy. The water isolation and corrosion resistance of the waterborne epoxy coating doped with 0.5%graphene (0.5%G-E44) in simulated seawater were studied by polarization curve measurement, electrochemical impedance spectroscopy (EIS), and neutral salt spray (NSS) test, and compared with that of untreated E44 epoxy coating. The results indicated that graphene is dispersed well in the solution and presents good water-isolating performance, which is overlapped layer by layer in the waterborne epoxy resin, forming a dense physical isolation layer and thus slowing down the diffusion rate of water molecules in the coating. Fick diffusion coefficients of E44 and 0.5%G-E44 immersed in simulated seawater at early stage are 5.56 × 10?9 cm2/s and 1.61 × 10?11 cm2/s, respectively. The protection performance of waterborne epoxy coating is obviously improved by adding grapheme, as shown by the decreasing of self-corrosion current density and the increasing of coating resistance and charge transfer resistance. The coating features a level and smooth surface after 200 h NSS test without distinct corrosion.