石墨烯富锌涂料的制备及其防腐蚀性能

将石墨烯加入到富锌涂料中能增强锌粉对基体铁板的"阴极保护"效应,但目前关于氧化石墨烯还原程度对涂料性能的影响研究不多。以通用的hummers法制备氧化石墨烯(GO),通过控制还原时间,得到不同还原程度的还原-氧化石墨烯(r GO)。以拉曼光谱、X射线衍射等表征手段测定r GO的还原程度。结果显示:还原12 h之后还原程度基本不变。将几组不同还原程度的r GO用于改性环氧富锌涂料得到r GO改性富锌涂料并制备涂层,通过盐雾试验、铁离子浓度测定、Tafel极化曲线测试等研究了r GO还原程度对防腐蚀涂料涂层防腐蚀性能的影响,并与未加石墨烯的环氧富锌涂料对比。结果表明:加入少量还原程度较低的r GO能提高含锌量86%传统富锌涂料涂层的防腐蚀性能;还原6 h即还原程度为58%的r GO改性富锌涂料涂层的防腐蚀性能最佳。

Preparation and Corrosion Resistance of Graphene Zinc-Rich Coatings

The graphene oxide( GO) was prepared by the common hummers method and a series of reduction-graphene oxide( r GO) with different reduction degrees was obtained by controlling the reduction time. Raman spectroscopy,X-ray diffractometer and other characterization methods were used to determine the reduction degree of graphene. Results showed that after reduction for 12 hours,the reduction degree was almost stable. Epoxy zinc-rich coating was then modified by several groups of r GO with different reduction degrees. The corrosion resistance of various anticorrosive coatings was systematically studied by means of salt spray test,iron ion concentration test,Tafel polarization curve test and so on. Results showed that the rich-zinc( 86%) coating modified by the r GO with the reduction time of 6 h( the reduction degree was58%) had the best corrosion resistance.