Preparation and hot-dip galvanizing application of CeO2/Zn nanocomposite
(1.College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China2.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
Abstract: CeO2/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 120min, nano-sized CeO2 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 CeO2 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 CeO2 nanoparticles into the hot-dip galvanized coating.
Key words: nanocomposite； high-energy ball milling； hot-press sintering； hot-dip galvanizing； corrosion resistance