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ZL205A高强度铸造铝合金因其具有良好的机械性能在航空、航天领域获得广泛应用。但ZL205A铸造铝合金存在晶间腐蚀的敏感性问题未得到应有的重视。本文通过某船载设备上的ZL205A铸造铝合金受力构件发生晶间腐蚀的实例来说明ZL205A铸造铝合金T5、T6状态下存在严重的晶间腐蚀倾向,其在户外海洋性恶劣气候环境下,当表面防护层发生破损的情况下可能产生晶间腐蚀,具有一定的危害性。
ZL205A high strength cast aluminum alloy has been widely used in aviation and aerospace because of its good mechanical properties. But ZL205A cast aluminum alloy existence of intergranular corrosion sensitivity problems have not been given due attention. In this paper, an example of intergranular corrosion of ZL205A cast aluminum alloy bearing member on a shipborne equipment is presented to illustrate the serious intergranular corrosion tendency of ZL205A cast aluminum alloy under T5 and T6 conditions. Under the harsh climatic environment outdoors, When the surface of the protective layer of the case of damage may occur intergranular corrosion, with some hazards.