锆微合金化6013型铝合金的抗晶间腐蚀性能

摘要

研究了一种锆微合金化6013型铝合金(Al-1.35%Mg-1.03%Si-0.895%Cu-0.539%Mn-0.112%Zr-0.436%Zn)(质量分数)的抗晶间腐蚀性能.结果表明:经470℃/24h均质化处理,变形量约150%的压缩变形加工,560℃/2h的固溶处理和151℃/8h+191℃/8h时效处理后,锆微合金化6013型铝合金具有良好的抗晶间腐蚀性能.按GB/T 7998-87和ASTM G110-92标准进行晶间腐蚀实验,其最大腐蚀深度为227.23μm,明显优干相同实验条件下的6061-T6(560℃/2h固溶处理,160℃/2h时效处理)合金.且锆微合金化6013型铝合金的显微硬度值达147.05 HV,较6061-T6合金高12.81%.分析表明,锆的微合金化作用及合金主成分特点改善了合金的显微组织,使得晶粒细化,析出相断续弥散分布,这是合金抗晶间腐蚀性能提高的主要原因.%The intergranular resistance of a zirconium microalloyed 6013 type ( Al-1. 35％ Mg-1. 03％ Si-0. 895％ Cu-0. 539％ Mn0. 112％ Zr-0. 436％ Zn) aluminum alloy was investigated. The results show that the alloy homogenized at 470 ℃ for 24h, deformed 150％ , solution at 560 ℃ for 2h, aged at 151 ℃ for 8h and 191 ℃ for 8h exhibits well intergranular resistance. According to GB/T 7998-1987 and ASTM G110 -92 standards, the maximum corrosion depth of the zirconium microalloyed 6013 type aluminum alloy is only 227.23 μm with the microhardness 147.05 HV, indicating better than that of 6061-T6 (solution at 560 ℃ for 2h and aged at 160 ℃ for 2h) alloy. Such performance can be explained by the addition of zirconium and the character of main componets, which are favorable for grain refinement, smaller and finer distributed precipitates.