Fabrication of Nano-NiO/Zn Composite and Its Application in Hot-dip Galvanizing

Nano-NiO/Zn composite was fabricated by high-energy ball milling and subsequent hot-press sintering in vacuum.The as-fabricated composite bulks were then added into hot-dip galvanizing bath and the galvanized coatings were prepared on 45 steel.The microstructure and morphology of the produced composite powders and bulks were characterized using XRD,TEM,FESEM and EDS.The wear resistance and corrosion resistance of the galvanized coatings with and without NiO nanoparticles were investigated by erosion test and weight loss test.The results show that nano-sized NiO particles distributed homogeneously in the Nano-NiO/Zn composite powders prepared by high-energy ball milling.With the addition of as-prepared bulks,the wear resistance of the galvanized coatings were improved obviously,while the corrosion resistance remained the same.