(河北工程大学 装备制造学院，邯郸 056038)
摘 要: 采用晶间腐蚀和剥落腐蚀性能测试研究冷轧变形量(50%~90%)对Al-Cu-Mg-Ag耐热铝合金抗腐蚀性能的影响，结合金相显微分析和透射电子显微分析对其机理进行探讨。结果表明：增大冷轧变形量能够细化合金的再结晶晶粒，减小无沉淀析出带的宽度及其与基体的电位差。合金的抗晶间腐蚀性能主要由合金的晶界结构决定。增大冷轧变形量能够提高合金的抗晶间腐蚀性能。合金的抗剥落腐蚀性能由晶界结构和晶粒形貌决定。随着冷轧变形量的增大，合金的剥落腐蚀速率先增大后减小；冷轧变形量为50%的试样抗剥落腐蚀性能最佳。
关键字: Al-Cu-Mg-Ag铝合金；冷轧变形；腐蚀机理；无沉淀析出带；晶粒形貌
（College of Equipment Manufacture, Hebei University of Engineering, Handan 056038, China）
Abstract:The effects of cold rolling deformation amount (50%-90%) on the corrosion resistance of Al-Cu-Mg-Ag heat-resistant Al alloy were investigated by intergranular corrosion (IGC) tests and exfoliation corrosion (EXCO) tests. The corrosion mechanism was researched by optical microscopy (OM) and transmission electron microcopy (TEM) analyses. The results show that with increasing the cold rolling deformation amount, the recrystallized grains are refined, the width of precipitation free zone (PFZ) and the potential difference between PFZ and the matrix decrease. The IGC resistance of the alloy is mainly determined by the microstructure of grain boundary, which is enhanced with increasing the cold rolling deformation amount. The EXCO resistance of the alloy is mainly determined by the microstructure of the grain boundary and the recrystallized grain morphology. The EXCO resistance of Al-Cu-Mg-Ag alloy decreases, and then increases with the increase of the cold rolling deformation amount. The alloy with deformation amount of 50% possesses the best EXCO resistance.
Key words: Al-Cu-Mg-Ag Al alloy; cold rolling deformation; corrosion mechanism; precipitation free zone; grain morphology
