Preparation and hot-dip galvanizing application of CeO_2/Zn nanocomposite

摘要

CeO_2/Zn nanocomposite was fabricated by high-energy ball milling and subsequent hot-press sintering under vacuum. The produced nanocomposite powders and bulks were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) with an energy dispersive X-ray spectrum (EDS). The as-fabricated nanocomposite bulks were added successfully into the hot-dip galvanizing bath to improve the corrosion resistance of coatings. The results show that after milling for 120 min, nano-sized CeO_2 particles are distributed homogeneously on the surface of fine Zn particles to form spherical-like nanocomposite powder with narrow grain size distribution. The subsequent sintering does not lead to a dramatic grain growth, and the distribution of CeO_2 nanoparticles in the composite bulk is also homogeneous. With the addition of as-prepared bulks, the corrosion resistance of the galvanized coatings is improved obviously. It provides a feasible route for adding CeO_2 nanoparticles into the hot-dip galvanized coating.