对一种Sr微合金化的7085型铝合金的晶间腐蚀性能和剥落腐蚀性能进行了研究.结果表明,该合金经均匀化退火、热压缩变形加工、强化固溶(470℃×2 h+480℃×2 h+490℃×2 h)处理、冷水淬火、T6(120℃×24 h)时效处理后,具有很好的抗晶间腐蚀性能和抗剥落腐蚀性能,其抗腐蚀性能明显优于7075-T6合金.按GB 7998-2005(ASTM G110-1992)晶间腐蚀试验标准,该合金未发生晶间腐蚀.仅发生点蚀.按GB/T 22639-2008(ASTM G34-2001)剥落腐蚀试验标准,其剥落腐蚀等级为PA级.该合金所具有的优异抗腐蚀性能与其具有较低的合金元素总量(10.073%)、较高的w(Zn)/w(Mg)(4.97)比和w(Cu)/w(Mg)(1.06)比以及Zr和Sr的微合金化作用(细化组织、抑制再结晶)是一致的.
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