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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。
The intergranular corrosion resistance and exfoliation corrosion resistance of a Sr microalloyed 7085 aluminum alloy were studied. The results show that the alloy is treated by homogenization annealing, hot compression deformation and solid solution treatment (470 ℃ × 2 h + 480 ℃ × 2 h + 490 ℃ × 2 h), cold water quenching, T6 (120 ℃ × 24 h) After aging treatment, has good resistance to intergranular corrosion resistance and anti-spalling corrosion resistance, corrosion resistance was significantly better than the 7075-T6 alloy. According to GB 7998-2005 (ASTM G110-1992) intergranular corrosion test standard, the alloy does not occur intergranular corrosion, pitting only occurs. According to GB / T 22639-2008 (ASTM G34-2001) flaking corrosion test standards, the exfoliation corrosion grade PA grade. The alloy has excellent corrosion resistance as compared with the total alloying element (10.073%), the higher w (Zn) / w (4.97) ratio and the higher w (Cu) / w 1.06) is consistent with the microalloying of Zr and Sr (refinement of the structure, inhibition of recrystallization).