Wavelets analysis of electrochemical noise generated during corrosion processes of pure Al in NaCl solution

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 whic 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 ofr global analysis,are contnuous.