2099铝锂合金晶间腐蚀行为与时效制度的相关性

许龙, 姚希, 李劲风, 蔡超

Correlation Between Intergranular Corrosion Behavior and Aging Treatment of 2099 Al-Li Alloy

XU Long, YAO Xi, LI Jingfeng, CAI Chao

表2 3种制度时效不同时间2099铝锂合金腐蚀类型和最大晶间腐蚀深度

Table 2 Corrosion modes of 2099 Al-Li alloy with various aging-treatments and corresponding measured maximum IGC depth

Temper Aging time / h Dominating corrosion mode Maximum IGC depth / μm T6 at 150 ℃ 0.5 Pitting None 3 LIGC+ 51.54 6 LIGC++ 242.87 18 GIGC 191.02 42 GIGC 196.58 66 GIGC 191.14 120 LIGC++ 198.63 150 Pitting None 195 Pitting None 0.5 LIGC 108.04 T6 at 175 ℃ 3 GIGC 209.96 6 GIGC 170.64 18 LIGC+ 140.63 48 Pitting None 72 Pitting None 96 Pitting None 0.5 Pitting None T8 at 150 ℃ 3 LIGC+ 92.31 6 Pitting None 18 Pitting None 48 Pitting None 72 Pitting None 96 Pitting None