Effects of laser micro-joining on microstructure and corrosion resistance of glass-ceramic coatings

The high-temperature sintering and ball milling were adopted to prepare SiO₂ glass and Cr₂O₃ ceramic composite powder. The glass-ceramic coating was prepared by using the high-velocity flame spraying on the surface of 45 steel. And laser micro-joining techniques were used as secondary treatment in order to improve its properties. Effect of laser micro-joining on microstructure and properties of glass-ceramic coatings were investigated. The results showed that the laser micro-joining method being taken as the secondary treatment,the compactness of the coating is improved and the coatings becomes more uniform,and the micropores and crack in the glass-ceramic coating are reduced; the bonding strength of the interface,hydrophobic properties and corrosion resistance of the coatings are enhanced obviously. Consequently, the comprehensive performance of the glass-ceramic coatings is dramatically enhanced when laser micro-joining is adopted as the secondary treatment.