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镁阳极适用于高电阻率土壤和淡水中的金属元件的保护。镁是电化学阴极保护工程中常用的牺牲阳极材料。化学活性高,电极电位负,驱动电压高。同时,在镁合金表面难以形成有效的保护膜。因此,在水介质中,镁表面的微腐蚀有很大的驱动力,保护膜容易溶解,镁的自腐蚀很强,在ziah的阴极上发生析氢反应。镁基牺牲阳极有三种:纯镁、镁锰合金和镁铝锌锰合金。它们的共同特点是低密度、大理论电容、负电位、低极化率、对钢的驱动电压高。适用于高电阻率土壤和淡水中的金属成分的保护。