Abstract
The effect of impact energy on localized corrosion behaviour of ultrasonic shot peened AA 7150 was systematically studied by manipulating peening parameters such as peening duration, peening amplitude, peening distance and peening media size. Needle-like pits with depths deeper than that of the untreated alloy were observed on low energy peened samples. However, localized corrosion was eliminated for high energy peened alloys. The formation of equiaxed nanograins on surface layer significantly enhanced pit initiation resistance but accelerated propagation kinetics. Galvanic interaction between surface layer and substrate alloy caused by surface segregation was also discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 218-230 |
| Number of pages | 13 |
| Journal | Corrosion Science |
| Volume | 130 |
| DOIs | |
| State | Published - Jan 2018 |
| Externally published | Yes |
Keywords
- AA7150
- Impact energy
- Kinetics
- Localized corrosion
- Surface nanocrystallization