Metal surface micro-patterning method

The invention discloses a metal surface micro-patterning method. A transparent liquid medium not reacted with metal is adopted as protecting liquid; and in particular, when sodium hydroxide solution is adopted, the quick degradation of magnesium in water is prevented, and the machining of a magnesium alloy material by femtosecond laser filamentation in water is realized. When a flowing liquid filmis adopted, the heat dissipation condition of the periphery of a machined part can be prominently improved; and meanwhile, bubbles generated in machining are taken away to prevent accumulation of chips, so that the self-cleaning in the machining process is realized. In addition, compared with high-energy femtosecond laser filamentation in air, on the basis of guaranteeing the machining quality ofa metal surface micro-nano structure, the machining precision can be prominently improved to reach about 10 microns, and meanwhile, the production equipment cost is reduced. More importantly, an active oxidation atmosphere fo