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Citation: Ge Hong-Hua, Zhou Guo-Ding, Wu Wen-Quan. The Spontaneous Passivation of Stainless Steel in Simulated Cooling Water and the Influence of Sulfide[J]. Acta Physico-Chimica Sinica, ;2003, 19(05): 403-407. doi: 10.3866/PKU.WHXB20030505 shu

The Spontaneous Passivation of Stainless Steel in Simulated Cooling Water and the Influence of Sulfide

1.
Electrochemical Research Group, Shanghai College of Electric Power, Shanghai　200090;College of Power Engineering, University of Shanghai for Science and Technology, Shanghai　200093

Received Date: 11 September 2002
Available Online: 15 May 2003

The spontaneous passivation of 316# stainless steel in simulated cooling water is studied by electrochemical impedance spectroscopy, and a suitable model is chosen through fitting. It is shown that the film resistance R2 increases while the value of Y02 , which reflects the film capacitance decreases continuously in the course of immersion of the electrode, but R2 decreases sharply with addition of sulfide. The Mott-Schottky plots show that the donor and accepter densities of the passive films on stainless steel immersed in simulated cooling water for 65 days have the values of 1.47×1020 cm－3 and 2.20×1020 cm－3, respectively, but the values increase to 4.52×1020 cm－3 and 7.02×1020 cm－3 after the addition of 9 mg•L－1 sulfide for 1 h. The polarization curves indicate that the passive current rises in the presence of sulfide.
- Mott-Schottky plot;Electrochemical impedance spectroscopy;Passive film;Stainless steel;Sulfide
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