期刊
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
卷 61, 期 9, 页码 783-789出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.200905413
关键词
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资金
- National Basic Research Program of China [2005CB623704]
- National Natural Science Foundation of China [50471057]
- Creative research group of National Natural Science Foundation of China [50721003]
- National Key Technology Reporting and Developing Program of China [2007BAE38B06]
The pitting corrosion behavior of 7150 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS) in the sodium chloride and hydrochloric acid solution. Based on EIS features and corrosion morphologies as well as corrosion potential, the process of pitting corrosion could be clearly divided into four stages: at the first stage, the Nyquist diagram was composed of two overlapping capacitive loops at the high-medial frequency and one inductive loop at the low frequency. At the second stage (metastable pits developing stage), there existed one small capacitive loop at the high frequency and one big capacitive loop at the medial frequency. At the third stage (stable pits developing stage), two time constants were more clearly distinguished, corresponding to two obvious capacitive loops. At the fourth stage, there appeared one capacitive loop, attributing to uniform corrosion. An equivalent circuit was designed to fit EIS, and the experimental results and the fitted results had good correspondence.
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