环境友好型自愈合涂层的防腐性能研究

Anticorrosion Performance of Environmental Friendly Self-healing Coatings

采用层层自组装技术将天然聚电解质壳聚糖、海藻酸钠和环保型缓蚀剂聚天冬氨酸交替沉积在纳米SiO_2表面,成功制备出智能纳米容器,将智能纳米容器分散到环氧涂层中构建仿生自愈合涂层。通过扫描电子显微镜(SEM)和傅立叶转换红外线光谱仪(FTIR)对智能纳米容器进行了表征,利用电化学阻抗技术研究了涂层/Q235钢体系在3.5%NaCl溶液中的腐蚀行为。结果表明,自愈合涂层的防腐性能较普通环氧涂层显著提高,且涂层受损后能够自愈合。

Nanocontainers were prepared through layer by layer（LbL） self-assembly technology with nano-sized SiO2 as a core and natural polyelectrolyte chitosan, sodium alginate and polyaspartic acid inhibitor as shell materials, which were further characterized by menas of Fourier transform infrared spectroscopy（FTIR） and scanning electron microscope（SEM）. Then bionic self-healing epoxy coatings were prepared by blending the nanocontainers with epoxy resin. The corrosion performance of coating/Q235 steel in 3.5% NaCl solution was investigated by electrochemical impendence spectroscopy（EIS）.Results show that the corrosion resistance of self-healing epoxy coatings is better than that of blank coatings, which have the ability of self-healing after damaging.