Batch hot-dip zinc-aluminum-magnesium plating layer as well as preparation method and application thereof

The invention relates to a batch hot-dip zinc-aluminum-magnesium plating layer and a preparation method and application thereof, and belongs to the field of metal surface corrosion prevention. The batch hot-dip zinc-aluminum-magnesium plating layer comprises the following components in percentage by mass: 0.5-2.0% of Al, 0.5-2.0% of Mg and the balance of Zn and inevitable impurities, and when the steel member is immersed in a molten zinc alloy bath for hot-dip plating so as to form a batch hot-dip zinc-aluminum-magnesium plating layer on the surface, the temperature of the zinc alloy bath is 500-540 DEG C; and the hot dipping time is 30-150 seconds. The batch hot-dip zinc-aluminum-magnesium plating layer has good appearance quality, and the plating layer has an excellent corrosion-resistant effect. 本申请涉及一种批量热浸镀锌铝镁镀层及其制备方法和应用，属于金属表面防腐领域。上述批量热浸镀锌铝镁镀层按质量百分比计组成为：0.5％～2.0％Al、0.5％～2.0％Mg、余量为Zn及不可避免的杂质，且在将钢构件浸入熔融的锌合金浴中进行热浸镀以在表面形成一层批量热浸镀锌铝镁镀层时，锌合金浴的温度为500℃～540℃；热浸镀时间为30s～150s。该批量热浸镀锌铝镁镀层具有良好的外观质量，镀层具有优异的耐腐蚀效果。