Zinc-aluminum-silicon-magnesium-molybdenum hot-dip alloy and hot-dip galvanizing method

The invention provides a zinc-aluminum-silicon-magnesium-molybdenum hot-dip alloy, which comprises 25-40 wt% of Al, 0.3-1.8 wt% of Si, 0.05-1.8 wt% of Mg, 0.005-0.1 wt% of Mo, and the balance of Zn and inevitable impurities carried by the zinc alloy, the hot-dip alloy structure is a short-axis crystal shaped like a Chinese character'tian ', the grain size of the alloy is 5-12 [mu] m, the proportion of a primary eta-Zn phase is less than 20%, and the number of eutectic structures and eutectoid structures reaches more than 70%. The hot-dip alloy disclosed by the invention not only can improve the fluidity, thin a plating layer and reduce the galvanizing cost, but also can eliminate the chromatic aberration of the plating layer, the plating layer is bright and bright, meanwhile, the scratch resistance and the recrystallization resistance can be remarkably improved, and the hot-dip alloy has an excellent application prospect. 本发明提供一种锌铝硅镁钼热镀合金，包括25～40wt%的Al、0.3～1.8wt%的Si、0.05～1.8wt%的Mg、0.005～0.1wt%的Mo，余量为Zn及锌合金所带的