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采用酸性盐雾试验,对Al-4.5Cu-0.8Mn和Al-7.3Zn-2.9Mg-1.9Cu 2种挤压铸造合金的耐腐蚀性能进行了对比研究。结果表明,在盐雾腐蚀过程中,随着腐蚀时间的延长和压力的增大,两种合金的耐腐蚀性能都出现了一定程度的下降。前者的腐蚀是由分布于枝晶间和晶界处的T(Al12CuMn2)和θ(Al2Cu)相溶解引起的,后者的腐蚀是由合金中η相的优先溶解,以及沿晶界分布的S相边沿的(Al)基体溶解所致;前者的耐腐蚀性能明显优于后者。
The corrosion resistance of two kinds of squeeze cast alloys Al-4.5Cu-0.8Mn and Al-7.3Zn-2.9Mg-1.9Cu were studied by acid salt spray test. The results showed that the corrosion resistance of both alloys decreased to a certain degree with the increase of corrosion time and pressure during salt spray corrosion. The former corrosion is caused by the dissolution of T (Al12CuMn2) and θ (Al2Cu) at the interdendritic and grain boundaries. The latter corrosion is caused by the preferential dissolution of the η phase in the alloy and the distribution of S Phase edge (Al) matrix dissolution caused by the former corrosion resistance was significantly better than the latter.