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Abstract An investigation on the features of electrochemical noises during pitting corrosion of aluminium,iron,carbon steel and two kinds of stainless steels in various passivating solutions with different concentrations of pas- sivators and Cl~- ion was carried out.All the electrochemical noises obser- ved are low frequency noises.The highest frequency f_c observed for a given solution usually increases with the increasing of Cl~- concentration.It seems that the higher the value of f_c is,the more easily the pit initiates,and that it is possible to evaluate the effectiveness of passivatorsor the resis- tance of metals against pitting corrosion by comparing f.Sometimes there is a maximum on the curve of f_c varying with Cl~- ion concentration, and pitting corrosion occurs before the maximum while general corrosion occurs after the maximum.All the spectral power densities measured show that the electrochemical noise is 1/(f~n) noise,though the value of n is somewhat different for different metals.A mathematical model for the spectral power density has been proposed.
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Received: 25 February 1989
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