Abstract
Nano-ZnO/graphene composites were prepared and added to potassium silicate zinc-rich coatings in order to obtain Nano-ZnO/graphene potassium silicate zinc-rich anti-corrosion coatings. Their morphology and corrosion resistance were charactered by scanning electron microscopy, electrochemical testing, and salt spray testing. The effect of Nano-ZnO/grapheme contents on the anticorrosion performance of coatings was also studied. Compared to neat water-based potassium silicate zinc-rich coatings with 50wt% zinc, Nano-ZnO/graphene potassium silicate zinc-rich coating with 30wt% zinc and 1wt% Nano-ZnO/graphene has better corrosion resistance. Their water resistance and Ecorr are improved, icorr is reduced by one order of magnitude, |Z|0.01Hz is increased by six times, and Rct is increased by three times. This study indicates that Nano-ZnO/graphene not only enhances anti-corrosion performance of potassium silicate zinc-rich anti-corrosion coatings, but also improves the utilization rate of zinc powder.