Abstract
The local pitting corrosion behavior of the pure aluminum in 3.5%NaCl solution was characterized by electrochemical noise analysis technique. The corrosion processes for aluminum were studied in detail by analyzing time-domain and frequency-domain characteristics of electro- chemical noise together with morphology features. The results show that the time-domain spectros- copy of the electrochemical noise can be used to predict the occurrence of local corrosion and quali- tatively distinguish the type of corrosion. It was found that the current standard deviation σI, noise resistance Rn and current white noise levels W can reflect the corrosion intensity. When the corro- sion occurs, σI and W tend to increase, but Rn tends to decrease.
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