TY - JOUR
T1 - A comparison of AA2024 and AA7150 subjected to ultrasonic shot peening
T2 - Microstructure, surface segregation and corrosion
AU - Sun, Qingqing
AU - Liu, Xingtao
AU - Han, Qingyou
AU - Li, Jie
AU - Xu, Rong
AU - Zhao, Kejie
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/3/15
Y1 - 2018/3/15
N2 - The influence of ultrasonic shot peening (USSP) on microstructure, surface segregation, localized and electrochemical corrosion of AA2024 was investigated using immersion test, OCP, EIS, polarization, XRD and SEM-EDS methods. The results are compared with those of AA7150. Like AA7150, second phase particles of AA2024 peened surface layer dissolved into Al matrix due to the extended solid solubility caused by USSP. After USSP, corrosion rate of AA2024 increased by 2–3 times due to surface contamination, however, intergranular corrosion (IGC) resistance of AA2024 is significantly enhanced by USSP treatment. The improvement in localized corrosion resistance is mainly attributed to grain refinement and microstructure homogenization. As opposed to AA7150, OCP of AA2024 in 3.5 wt% NaCl solution (pH = 5.8) shifts to more noble direction after USSP. This is due to the different surface segregation behaviours of the two studied alloys. The mechanism of surface segregation is also briefly discussed.
AB - The influence of ultrasonic shot peening (USSP) on microstructure, surface segregation, localized and electrochemical corrosion of AA2024 was investigated using immersion test, OCP, EIS, polarization, XRD and SEM-EDS methods. The results are compared with those of AA7150. Like AA7150, second phase particles of AA2024 peened surface layer dissolved into Al matrix due to the extended solid solubility caused by USSP. After USSP, corrosion rate of AA2024 increased by 2–3 times due to surface contamination, however, intergranular corrosion (IGC) resistance of AA2024 is significantly enhanced by USSP treatment. The improvement in localized corrosion resistance is mainly attributed to grain refinement and microstructure homogenization. As opposed to AA7150, OCP of AA2024 in 3.5 wt% NaCl solution (pH = 5.8) shifts to more noble direction after USSP. This is due to the different surface segregation behaviours of the two studied alloys. The mechanism of surface segregation is also briefly discussed.
KW - AA2024
KW - AA7150
KW - Corrosion
KW - Surface nanocrystallization
KW - Surface segregation
KW - Ultrasonic shot peening
UR - https://www.scopus.com/pages/publications/85041377121
U2 - 10.1016/j.surfcoat.2018.01.072
DO - 10.1016/j.surfcoat.2018.01.072
M3 - 文章
AN - SCOPUS:85041377121
SN - 0257-8972
VL - 337
SP - 552
EP - 560
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -