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| MONITORING THE INITIAL PITTING BEHAVIORS OF 1Cr18Ni9Ti STAINLESS STEEL BY ELECTROCHEMICAL NOISE AND ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY |
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| 南昌航空工业学院；北京科技大学 |
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Abstract The initial pitting of 1Cr18Ni9Ti stainless steel in 3.5% NaCl solution was studied by electrochemical noise(ECN) and electrochemical impedance spectroscopy(EIS). The results indicated that, the initial immersion stage (to 48 hours), the fluctuation amplitude of potential and current noise were small, the slope of the power spectral density of potential(PSDV)plots changed hardly,and an inductive component was observed on impedance plane, which means the formation of the metastable pitting and continuous reparation of the passive film on the surface of the 1Cr18Ni9Ti stainless steel.When immersed to the stage of 48 hours to 60 hours,noise pulse emerged in the plots of electrochemical noise,the slope of the power spectral density (PSD) plots changed suddenly, on the impedance plane inductive component disappeared, which means the transition from metastable to stable pitting. SEM image showed pitting emerged in the surface after immersion for 60 hours.
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Received: 13 February 2006
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