低成本制备铁基金属表面防腐蚀无机涂层

Low Cost Fabrication of Anti-Corrosive Coatings on Metal Surfaces

研究了碱(水玻璃)激发高纯度的偏高岭土作为金属表面的防腐蚀水性涂层的可行性,初步确定了水玻璃的模数、总固含量、适用环境以及固定剂和增强剂的种类。当水玻璃的模数n=1.5,固定剂为ZnO,总固含量在67%～71%时,涂膜在适宜养护环境下养护5d后的硬度可达8H铅笔硬度,用划格法测量粘着力可达1级。在自来水、海水、稀酸、稀碱和硫酸钠溶液中存放40d没有明显腐蚀。用SEM观察涂膜,发现涂膜中有硅铝酸网状结构的产物组成,外加剂分散在网格中,形成了致密的膜。

It is possible to use alkali-activated metakaolin as protective coatings for metal surface from corrosion under the optimized modulus of the water-glass, the amount of the solids and the sort of curing agents and additives. The coating of 8H pencil hardness and the adhesion of 1 grade was obtained in use of the water glass of modulus 1.5, ZnO as the additives and the solid content of 67%～71%. No corrosion occurred to immerse the coated materials into tap water, seawater, diluents acid and alkali for 40 days. SEM analysis showed the formation of netlike structure of silicate and aluminates in the coating. The additives dispersed in the coating matrix and formed compact network.