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INFLUENCE OF TEMPERATURE ON THE ELECTROCHEMICAL PROPERTY OF PASSIVE FILM FORMED ON X80 PIPELINE STEEL |
LI Jinbo;ZUO Jian'e |
Department of Environmental Science and Engineering; Tsinghua University;Beijing 100084 |
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Abstract The influence of temperature on the electrochemical property of passive film formed on X80 pipeline steel in simulated soil environment was investigated by using electrochemical impedance spectroscopy (EIS) technique, and the effect of temperature on the electrochemical property of passive film was analyzed using point defect model (PDM). The results showed that the steady current density of passive film and donor density increased, film resistance, transfer resistance and diffusivity $D$ decreased with increasing temperature. According to PDM, the influence of temperature on the electrochemical property of passive film was related to the increment of donor density in the film with increasing temperature.
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Received: 04 April 2007
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Corresponding Authors:
ZUO Jian'e
E-mail: jiane.zuo@mail.tsinghua.edu.cn
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