1results about How to "Avoid air holes" patented technology

This invention discloses a composite strengthening process for the surface of a hot-dip galvanized molten zinc transfer pump impeller, comprising the following steps: ① impeller surface pretreatment; ② supersonic spraying of a WC+15%Co coating; ③ laser remelting: laser remelting the WC+15%Co coating; ④ precision polishing of the remelted layer: polishing the WC+15%Co coating to achieve a surface roughness <Ra0.4μm; ⑤ PVD TiCN functional coating deposition: preparing a TiCN functional coating on the WC+15%Co coating surface using physical vapor deposition, achieving a TiCN coating surface roughness <Ra0.2μm. This composite strengthening process, through the synergistic treatment of supersonic spraying, laser remelting, and PVD coating, effectively seals surface pores in cast steel and cast iron impellers while simultaneously providing excellent corrosion resistance and zinc adhesion resistance. This completely solves the technical problem of cast steel and cast iron impellers being prone to zinc adhesion and corrosion in molten zinc, significantly extending impeller service life and improving hot-dip galvanizing production efficiency.