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| A photoelectrochemical study on passive films of stainless steel in simulated cooling water with sulfide |
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| 上海电力学院 |
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Abstract The photoelectrochemical measurement of stainless steel in simulated cooling water shows that, the passive film on the stainless steel exhibits n-type photoresponse, and the peak of absorption happens at 310nm. The passive film on stainless steel starts to generate photocurrent at potential about -0.35V. As the potential rises, the photocurrent increases, and the bandgap energy Eg of the passive film fall. The addition of sulfide in the simulated cooling water can increase the photocurrent, and reduce the Eg values of the passive film on stainless steel. The greater the concentration of the sulfide is, the larger the measured photocurrent and the lower will be the Eg. That is attributable to the fall of the film resistance of the passive film and the decrease of content of chromium oxides in the passive film.
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Received: 15 February 2006
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