填料对无机硅酸锌涂层耐腐蚀性能的影响

利用正交试验方法确定锌粉、磷铁粉和高岭土在水性无机硅酸锌涂层中的加入量,在不同条件下评价涂层的耐腐蚀性能,通过扫描电镜(SEM)和X射线衍射仪(XRD)分析了腐蚀产物的形貌和微观结构,采用电化学方法测试了涂层的极化曲线。结果表明:添加填料的无机硅酸锌涂层具有良好的耐腐蚀性,涂层抗腐蚀介质渗透的能力提高。涂层最佳成分配比为纯锌粉加入量为固相部分总质量的70%、磷铁粉为10%、高岭土为18%和膨润土为2%。相比纯锌粉涂层,其成本降低了近30%。

School of Mechanical Electronic and Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083

The dosage of pure zinc,ferrophosphorus and kaolin in inorganic zincsilicate coating was determined by orthogonal test. The corrosion protective performance of coatings was evaluated under different conditions, the appearance and microstructure of coatings were analyzed by scanning electron microscopy (SEM) and Xray diffraction (XRD), and polarization curves of coatings were researched by electrochemical tests. The results show that the inorganic zincsilicate coating with filler has good corrosion protection performance and the capability of preventing corrosive medium penetrating is improved. The best component ratio of the coating is that pure zinc of solid phase is 70%, ferrophosphorus is 10%, kaolin is 18%, bentonite is 2%. Its cost is 30% lower than that of pure zinc coating.