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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Wavelets analysis of electrochemical noise generated during corrosion processes of
pure Al in NaCl solution
GAO Yun-fang(高云芳)1,2, ZHANG Zhao(张 昭)1,
LI Jin-feng(李劲风)1, CAO Fa-he(曹发和)1,
CHENG Ying-liang(程英亮)1, ZHANG Jian-qing(张鉴清

1. Department of Chemistry, Zhejiang University,
Hangzhou 310027, China;
2. College of Chemical and Materials Engineering, 
Zhejiang University of Technology, Hangzhou 310014, China;
3. State Key Laboratory for Corrosion and Protection of Metals,
Institute of Metal Research, 
the Chinese Academy of Sciences, Shenyang 110016, China

Abstract:The potential noise during corrosion of pure aluminum in sodium chloride solution was recorded and analyzed with wavelet transform technique. The typical results show that the electrochemical noise (EN) signal is composed of distinct type of events, which can be classified according to their scales, i.e. time constants. And the process underlying the rapid fluctuations of EN, which is characterized by a small scaling value, i.e. high-frequency components and which is usually used for local analysis, is not consistant with time; whilst those associated with slower processes or characterized by a large scaling value, which are usually used for global analysis, are continuous.

 

Key words:  wavelet analysis; electrochemical noise; localized corrosion; pure aluminum; chaos

ISSN 1672-7029
CN 43-1423/U

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