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EIS study on 2024‐T3 aluminum alloy corrosion in simulated acid rain under cyclic wet‐dry conditions
Author(s) -
Shi Y.Y.,
Zhang Z.,
Su J.X.,
Zhang J.Q.
Publication year - 2005
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200503869
Subject(s) - corrosion , nyquist plot , materials science , alloy , capacitive sensing , metallurgy , aluminium , electrode , electrochemistry , composite material , dielectric spectroscopy , chemistry , electrical engineering , engineering
The wet‐dry cycle corrosion processes of 2024‐T3 aluminum alloys under different pH environments were investigated using electrochemical impedance (EIS) technique in conjunction with SEM method. The results show that, during the dry period of each cycle, the electrode potential was relatively stable and the corrosion processes can be studied using EIS technique. In the case of pH 3.5 and during the entire corrosion process, the Nyquist plot was composed of a high‐frequency capacitive arc due to corrosion reaction and a low‐frequency capacitive arc due to the formation of corrosion products layer, and the corrosion rate during the same cycle was almost the same. In the case of pH 4.5 and during the first several cycles, the Nyquist plot was composed of nearly only one capacitive arc due to the corrosion reaction, and the corrosion rate during the same cycle increased with time. Additionally, the EIS features of the entire corrosion processes of 2024‐T3 aluminum alloy were interpreted theoretically.