研究了不同冷速下Zn +6％Al +3％Mg合金原始镀液凝固组织和形貌的变化,并对不同冷速下合金的耐腐蚀性能进行了分析.结果表明,不同冷速条件下,合金中出现先析出相Al、Al和Zn、Al/MgZn2共晶组织、Zn/Al/MgZn2三元共晶组织,但炉冷,水冷下还生成了Zn/Al/MgZn11三元共晶.随冷却速度增加,晶粒尺寸愈加细小.空冷下合金耐腐蚀性能相对较好,炉冷相对较差,这与其晶粒度和Mg2Zn11相有关.
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