A New Information Method to Determinate Corrosion Types from Electrochemical Noise

doi:10.1007/s40195-015-0216-x

Abstract

Abstract:

Electrochemical noise data in the presence of different corrosion types were analyzed. A correlation between the corrosion type of the observed noise and the entropy rate was recognized. A sequence was transformed from each set of original electrochemical noise signal, then the Markov process M and stationary distribution μ were calculated. Finally, entropy rate of each sequence was obtained by the definition. From the entropy rate, it has been observed that local corrosion showed a lower entropy rate, while uniform corrosion showed a higher entropy rate.

Key words: Entropy rate, Stainless steel, Corrosion, Electrochemical behavior

Jian Li, Huan-Jun Zheng, Ye Zheng, Wei-Kang Kong, Ke Wang. A New Information Method to Determinate Corrosion Types from Electrochemical Noise[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(4): 449-453.

Figures/Tables 4

Fig. 1 Metallographs showing the original surface of 304SS a, pitting corrosion morphology b, uniform corrosion morphology c, passivation surface d of 304SS after immersion [20]

Fig. 2 Phase spaces for pitting corrosion a, uniform corrosion b passivation c

Fig. 3 Scatter plot of the entropy rate for 304SS in different solutions

Fig. 4 Cumulative probability of noise resistance a, entropy rate b of 304SS in different solutions

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