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