(河北工程大學 裝備制造學院，邯鄲 056038)
摘 要: 采用晶間腐蝕和剝落腐蝕性能測試研究冷軋變形量(50%~90%)對Al-Cu-Mg-Ag耐熱鋁合金抗腐蝕性能的影響，結合金相顯微分析和透射電子顯微分析對其機理進行探討。結果表明：增大冷軋變形量能夠細化合金的再結晶晶粒，減小無沉淀析出帶的寬度及其與基體的電位差。合金的抗晶間腐蝕性能主要由合金的晶界結構決定。增大冷軋變形量能夠提高合金的抗晶間腐蝕性能。合金的抗剝落腐蝕性能由晶界結構和晶粒形貌決定。隨著冷軋變形量的增大，合金的剝落腐蝕速率先增大后減小；冷軋變形量為50%的試樣抗剝落腐蝕性能最佳。
關鍵字: Al-Cu-Mg-Ag鋁合金；冷軋變形；腐蝕機理；無沉淀析出帶；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
