Journal
CORROSION SCIENCE
Volume 113, Issue -, Pages 1-16Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2016.09.013
Keywords
Aluminum; EIS; Polarization; TEM; Pitting corrosion
Funding
- Innovation Foundation of BUAA
- National Nature Science Foundations of China (NSFC) [51271012]
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The bimodal grain sized 7075 aluminum alloys with different ratios of coarse and fine grains were prepared and naturally aged for 300 d. The effects of grain size on pitting characteristics of alloys were investigated. Compared to those in fine grains, the intermetallic particles in coarse grains had bigger size, higher alloying elements content, larger area fraction and lower population density. With the increasing ratio of fine grains, the frequency of pitting current transients increased, while the lifetime and peak value of current transients decreased; the number and volume of stable pits on alloys also decreased considerably. (C) 2016 Elsevier Ltd. All rights reserved.
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