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| PASSIVATION MODEL OF STAINLESS STEEL IN SIMULATED COOLING WATER |
| Ge Honghua;Zhou Guoding; Wu Wenquan |
| 上海电力学院环境工程系国家电力公司热力设备腐蚀与防护重点实验室 |
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Abstract The electrochemical impedance spectroscopy for stainless steel in simulated cooling water during long time immersion (1~65 days) and short time immersion (in one hour) are measured. The data are fitted using four models, and a suitable model is selected. The fitting results appear that, during the long time immersion period, the charge-transfer resistance R1 is relatively small and the double layer capacity Y01 is relatively large at the beginning of the immersion. When the immersion time increases, the values of R1 and Y01 stabilize. The film resistance R2 increases while the value of Y02 decreases continuously with the immersion, indicating that the passive film is getting thicker and more compact. The value of R2 is about four orders larger than R1 after 8 days' immersion. During the short time immersion period, R1 is close to R2 at 5 min; R1 changes little with time, but R2 increases by one order at 15 min and rises continuously with the immersion.
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Received: 17 December 2003
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