Compared with the peak-aged alloy, the over-aged alloy contains more equilibrium phases at the grain boundaries and wider PFZ, and thus suffers from faster intergranular and exfoliation corrosion.

• 过时效状态与峰时效状态相比， 晶界平衡相增多， 无析出带变宽， 晶间腐蚀及剥落腐蚀程度将更加严重。