石墨烯对水性环氧富锌涂料中锌粉的取代能力研究

针对水性重防腐涂层体系中水性环氧富锌底漆高锌粉含量所带来的生产成本高、不易贮存、环境污染大等问题，采用在涂料中添加少量石墨烯以取代部分锌粉的改进方法。通过动电位极化曲线、电化学阻抗谱等方法研究了锌粉含量以及石墨烯添加量对环氧富锌涂料性能的影响，结果表明：涂层的耐腐蚀性随着锌粉含量增加而提高，锌粉占锌粉与硫酸钡总质量的 80%时，腐蚀速率为 0. 002 03毫米 /年（ mm/y），当涂层中锌粉占锌粉与硫酸钡的总质量的 20%时，随着石墨烯添加量从占锌粉、硫酸钡与石墨烯总质量的 0增加至 0. 8%，腐蚀速率先上升后下降，当石墨烯含量达到 0. 6%时，腐蚀速率为 0. 0 038 mm/y，涂层的耐腐蚀性达到最大值。

The Study on the Corrosion Resistant Property of Graphene Modified Waterbonre Zinc-Rich Epoxy Coatings

Regarding the problems of high production cost,difficult storage and environmental pollution caused by the high zinc content in waterborne epoxy zinc-rich primer in the waterborne heavy-duty coating system,an improvement method of adding a small amount of graphene material to the coatings to replace part of the zinc powder was adopted.The effects of zinc powder content and graphene addition on the performance of epoxy zincrich coatings were investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy. It was shown that the corrosion resistance of the coatings increased with the increase of zinc powder content and when the content of zinc powder reach 80 wt%,the corrosion rate was 0. 00 203 mm/y. The corrosion rate decreased first and then increased with the increase of graphene material content. When the content of Zn was 20 wt%,with a graphene material content of 0. 6 wt%,the corrosion resistance of the coatings reached the maximum and corrosion rate was 0. 0 038 mm/y.