Achieving refined overlay microstructure of a zn-55al-3mg-1.5si coating using high power diode laser (hpdl) surface treatment
Lasers in Engineering
A high power diode laser (HPDL) was successfully used as a surface modifying approach on a hot dip process simulator (HDPS) Zn-55Al- 3Mg-1.5Si coating. The overlay microstructure was drastically refined owing to the rapid cooling rate of the laser radiation process, in which the size of α-Al dendrite was shrunk to less than 1/10 of the original. The laser also varied the solidifying path and yielded different phases in the interdendritic areas leading to modifications including, rare Si, disappearance of MgZn2 and nucleation of the Q phase. The modified Zn-55Al- 3Mg-1.5Si coating induced by HPDL surface treatment is assumed to make a contribution to the improvement of the corrosion resistance.
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