A STUDY ON THE FEATURES OF CURRENT NOISES DURING PITTING CORROSION

J Chin Soc Corr Pro

1990, Vol. 10

Issue (1): 22-28 DOI:

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A STUDY ON THE FEATURES OF CURRENT NOISES DURING PITTING CORROSION

Cao Chunan Shi Qingrong Lin Haichao (Corrosion Science Laboratory;Institute of Corrosion and Protection of Metals Academia Sinica)

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Abstract Investigations on the features of electrochemical noises during pitting corrosion of iron and two sorts of stainless steels were carried out under potentiostatic conditions.The results show that the fea- tures of the electrochemical noises from the fluctuation of current are common to all the systems studied,namely,the fluctuation spikes rise linearly and decay exponentially.Curves of spectral power density (SPD)for all the systems studied show that the electrochemical noises are low frequency 1/f~n noise and turn to“whitenoise”at very low frequencies.The estimated values of n lie between 2 and 4 depen- ding upon the nature of metals and the applied potential.The equation of SPD proposed in a previous paper is confirmed by the data in this work and the variation of the value of n is discussed based on this equation.

Received: 25 February 1990

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Cao Chunan Shi Qingrong Lin Haichao (Corrosion Science Laboratory;Institute of Corrosion and Protection of Metals Academia Sinica). A STUDY ON THE FEATURES OF CURRENT NOISES DURING PITTING CORROSION. J Chin Soc Corr Pro, 1990, 10(1): 22-28.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1990/V10/I1/22

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