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采用硬度和电导率测试、晶间腐蚀和剥落腐蚀试验、金相及扫描电镜观察,研究强化固溶处理对含锶(Sr)7085型铝合金(Al-7.95Zn-1.80Mg-1.59Cu-0.15Zr-0.024Sr)硬度、电导率、晶间腐蚀和剥落腐蚀性能的影响。结果表明,与常规固溶(470℃/2 h)处理相比,强化固溶(470℃/h+480℃/2 h+490℃/2 h)处理使合金中粗大第二相溶解更为充分,经进一步常规T6(121℃/2 h)时效处理后,强化固溶处理的合金其硬度略微降低、电导率有所提高,抗晶间腐蚀和剥落腐蚀性能显著提高。本文的研究结果说明,强化固溶处理是一种提高含Sr 7085型铝合金抗腐蚀性能尤其是抗剥落腐蚀性能的有效手段。
The hardness and electrical conductivity tests, intergranular corrosion and exfoliation corrosion tests, metallographic examination and scanning electron microscopy (SEM) were used to investigate the effects of strengthening and solution treatment on the mechanical properties of Al-7.95Zn-1.80Mg-1.59Cu-0.15 Zr-0.024Sr) hardness, conductivity, intergranular corrosion and exfoliation corrosion properties. The results showed that the treatment of strengthening and solid solution (470 ℃ / h + 480 ℃ / 2 h + 490 ℃ / 2 h) resulted in the dissolution of the coarse second phase in the alloy more than that of the conventional solution treatment (470 ℃ / 2 h) In addition, after further conventional aging treatment at T6 (121 ℃ / 2 h), the hardness of solution strengthening alloy decreased slightly, the electrical conductivity increased, and the intergranular corrosion resistance and exfoliation corrosion resistance increased remarkably. The results of this study show that strengthening solution treatment is an effective way to improve the corrosion resistance of Sr 7085 aluminum alloy, especially the anti-spalling corrosion resistance.