On the Electrochemical and Quasi In Situ Corrosion Response of the Q-Phase (AlxCuyMgzSiw) Intermetallic Particle in 6xxx Series Aluminum Alloys

CORROSION ◽  
10.5006/2249 ◽  
2016 ◽  
Vol 73 (1) ◽  
pp. 87-99 ◽  
Author(s):  
S.K. Kairy ◽  
P.A. Rometsch ◽  
C.H.J. Davies ◽  
N. Birbilis
Keyword(s):  
Aluminum Alloys ◽  
Intermetallic Particle ◽  
6Xxx Series

scholarly journals Studies on Pitting Corrosion of Al-Cu-Li Alloys Part I: Effect of Li Addition by Microstructural, Electrochemical, In-situ, and Pit Depth Analysis

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1600 ◽  
Author(s):  
Xiaowei Lei ◽  
Alireza Saatchi ◽  
Elmira Ghanbari ◽  
Runze Dang ◽  
Wenzhe Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aluminum Alloys ◽  
Pitting Corrosion ◽  
Development Stage ◽  
Electrochemical Analysis ◽  
Lithium Content ◽  
In Situ Observation ◽  
Depth Analysis ◽  
Stage Stage

To analyze the effect of lithium and microstructure on the pitting corrosion behavior of aluminum alloys, three types of aluminum alloys were studied via scanning electron microscopy, transmission electron microscopy, electrochemical polarization, and by immersion tests coupled with in-situ observation of pitting and statistical analysis of pit depths measured by surface profilometry. It was found that, with increasing lithium content, the resistance to pitting corrosion was enhanced and the passive range was enlarged. In-situ observation revealed that the development of pitting corrosion exhibited three stages, including an initial slow nucleation stage (Stage I), a fast development stage (Stage II), and a stabilized growth stage (Stage III). Higher lithium content contributed to shorter time periods of Stages I and II, resulting in faster pitting evolution and a higher number of pits. However, the pits were generally shallower for the specimen with the highest lithium content, which is in agreement with the results of the electrochemical analysis.

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