Nanosecond laser cleaning for enhanced zinc coating quality of HSLA steel

The influence of nanosecond laser cleaning created surface textures on hot-dip galvanizing coating quality of industrial HSLA steel plate has been investigated in this work. The results show that the zinc coating of the sample with laser cleaning pretreatment is more uniform, bright and no-defect as compared to the traditional pickling process treated sample. With laser cleaning created surface textures, the zeta phase of the zinc-iron alloy layer is easy to form and grow in the protrusions on the base surface, and the delta phase is easy to form in the depressions. When the coating thickness is approximately the same, the special phase structure of the zinc coating on the surface of the laser cleaned sample makes the cracks preferentially expand from the coating depression to the coating surface, reducing the shedding of the coating, and improving the coating resistance to pulverization.

Automated summary

In comparison to traditional pickling process, the zinc coating on the surface of industrial HSLA steel plate treated with laser cleaning pretreatment is more uniform, bright, and defect-free. Additionally, the surface textures created by laser cleaning help improve the coating's resistance to pulverization.