聚苯胺/氧化石墨烯水性环氧富锌涂料的制备及防腐性能研究

Study on Preparation and Anti-corrosion Properties of Polyaniline/Graphene Oxide Waterborne Epoxy Zinc-rich Coatings

以苯胺和氧化石墨烯(GO)为原料,采用原位聚合法,通过改变GO氧化程度制备了不同的聚苯胺/氧化石墨烯(PAGO)复合材料,再利用PAGO对水性环氧富锌涂料进行改性。通过傅立叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)、X光电子能谱仪(XPS)、扫描电镜(SEM)分析了GO与PAGO的结构和微观形貌;研究了涂层的耐盐雾性、电化学性能、耐冲击性、柔韧性、硬度,并探究了PAGO及锌粉含量对该涂层的耐腐蚀性和力学性能影响。结果表明:以2 g石墨与5 g高锰酸钾制得GO,再用GO制备的PAGO防腐性能最佳。添加PAGO能有效延缓钢材的腐蚀,当PAGO-3添加量为0.2%(质量分数,下同),锌粉含量80%时,制得的PAGO/水性环氧富锌涂料的综合性能最佳;此外,当PAGO-3掺量为0.2%,锌粉含量为60%时,PAGO可取代原水性环氧富锌涂层20%的锌粉,与含80%锌粉的原水性环氧富锌涂层的耐盐雾效果接近。

Polyaniline/graphene oxide(PAGO)composites were prepared through in-situ polymerization using aniline and GO as raw materials by changing the oxidation degree of GO,and waterborne epoxy zinc-rich coatings were modified with PAGO.The structure and microscopic morphology of GO and PAGO were analyzed by Fourier Transform Infrared spectrometer(FT-IR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM).The salt spray resistance,electrochemical properties,impact resistance,flexibility and hardness of the coating were studied,and the effects of PAGO and zinc powder content on the corrosion resistance and mechanical properties of the coating were also investigated.As the results shown,PAGO prepared from GO indicated excellent anti-corrosion performance,and the GO was prepared using 2 g graphite and 5 g KMnO4.The addition of PAGO could effectively delay the corrosion of steel.When the content of PAGO-3 was 0.2% (mass content,the same below)and the content of zinc powder was 80%,the synthesized PAGO/waterborne epoxy zinc-rich coating indicated the best comprehensive performance.In addition,when the content of PAGO-3 was 0.2% and the content of zinc powder was 60%,PAGO could replace 20% zinc powder of the water-based epoxy zinc-rich coating,and its salt spray resistance was similar to that of the water-based epoxy zinc-rich coating containing 80% zinc powder.