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| ON THE“WHITE NOISE”AND CUT-OFF FREQUENCY OF ELECTROCHEMICAL NOISES DURING PITTING CORROSION |
| Shi Qingrong Lin Haichao Cao Chunan (Corrosion Science Laboratory;Institute of Corrosion and Protection of Metals Acdemia Siniac) |
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Abstract The influences of applied potential,Cl~(-)-concentration and applied anodie current density on the characteristic parameters of electro- chemical noises during pitting corrosion were investigated.It was found that the effects of Cl~(-)-concentration and applied anodic current density on the apparent value of n of 1 /f~n noises were negligible, while the level of the“white noise”at very low frequencies Gw and the cut-off frequency f_c of spectral power density curves increased with increasing Cl~(-)-concentration and applied anodic current density and with raising of electrode potential if no real pits could be detected on the surface of passivated metals.It is inferred that Cl~(-)-concen- tration and applied anodic current density only influence the rate of occurrence of pit nuclei but do not influence the processes of growth and re-passivation of single pit nucleus,and that the resistance of passivated metals can be evaluated by Gw and f_(?) during pit incubation period.
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Received: 25 February 1990
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Cite this article:
Shi Qingrong Lin Haichao Cao Chunan (Corrosion Science Laboratory;Institute of Corrosion and Protection of Metals Acdemia Siniac). ON THE“WHITE NOISE”AND CUT-OFF FREQUENCY OF ELECTROCHEMICAL NOISES DURING PITTING CORROSION. J Chin Soc Corr Pro, 1990, 10(1): 29-34.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1990/V10/I1/29
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[5] 刘大成,曹楚南、王福会、楼翰一、张立新,金属学报,24(5) ,B369(1988) |
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