Localized corrosion behaviour of AA7150 after ultrasonic shot peening: Corrosion depth vs. impact energy

被引：103
作者：
Sun, Qingqing [1 ,2 ]
Han, Qingyou [1 ]
Xu, Rong [3 ]
Zhao, Kejie [3 ]
Li, Jie [2 ]
机构：
[1] Purdue Univ, Sch Engn Technol, W Lafayette, IN 47907 USA
[2] Cent S Univ, Sch Chem & Chem Engn, Changsha 410012, Hunan, Peoples R China
[3] Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA
来源：
CORROSION SCIENCE | 2018年 / 130卷
关键词：
AA7150; Surface nanocrystallization; Localized corrosion; Impact energy; Kinetics; MECHANICAL ATTRITION TREATMENT; SEVERE PLASTIC-DEFORMATION; SURFACE NANOCRYSTALLIZATION; ALUMINUM-ALLOY; AL-ALLOY; INTERGRANULAR CORROSION; TI-6AL-4V ALLOY; STAINLESS-STEEL; LAYER; MICROSTRUCTURE;
D O I：
10.1016/j.corsci.2017.11.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：218 / 230
页数：13
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