γ -氨丙基甲基二甲氧基硅烷改性环氧涂料的耐腐蚀性能研究

Study on Corrosion Resistance of γ-aminopropyl-methyl-dimethoxy Silane Modified Epoxy Coatings

采用γ-氨丙基甲基二甲氧基硅烷改性环氧涂料并用于马口铁片的防腐处理。考察了涂层的热稳定性和极化曲线,通过扫描电镜观察涂层表面形貌,并采用盐雾试验验证耐腐蚀性能,通过X射线光电子能谱解析结构信息。结果表明,经硅烷改性后环氧树脂涂层的热稳定性提高,综合腐蚀速率仅为未改性时的22%,表面平整,无明显缺陷,耐腐蚀性良好,且与基材结合较牢固,改性涂料中的硅烷与马口铁基材表面形成了Si—O—M。

Epoxy coating modified by γ -aminopropyl-methyl-dimethoxy was used for anticorrosive treatment on tinplate. The thermal stability and polarization curve of the coatings were investigated, and the surface morphology of the coating was observed by SEM, and the corrosion resistance of the coating was verified by the salt spray test. The structure information of the modified coating was analyzed by XPS. Results show that the thermal stability of the coatings is improved after modification, and the polarization curve shows that the corrosion rate of the modified coating is only 22% of the unmodified coating. SEM results show that both the coatings are flat and have no obvious defects. The results of salt spray test show that the modified coating has good corrosion resistance, bond well with the base material. XPS analysis shows that Si-O-M bond forms on the surface of the tinplate and silane in the modified coating.