| 模拟冷却水中不锈钢的自钝化及硫离子的影响 |
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| 引用本文： | 葛红花,周国定,吴文权.模拟冷却水中不锈钢的自钝化及硫离子的影响[J].物理化学学报,2003,19(5):403-407. |
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| 作者姓名： | 葛红花 周国定 吴文权 |
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| 作者单位： | Electrochemical Research Group, Shanghai College of Electric Power, Shanghai 200090;College of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093 |
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| 基金项目： | 上海市高等学校科学技术发展基金(020K01)，上海市教委重点培育学科基金资助项目~~ |
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| 摘 要： | 通过对316＃不锈钢/模拟冷却水体系电化学阻抗谱(EIS)的测定和拟合，确定了合适的模型.根据此模型，膜电阻R2在电极浸泡过程中增大， 反映膜电容的Y02值则不断减小，显示钝化膜的增厚和致密.模拟冷却水中硫离子的加入使R2迅速降低.Mott-Schottky图测定显示，在模拟冷却水中浸泡65天的不锈钢钝化膜的施主密度ND和受主密度NA分别为1.47×1020和2.20×1020 cm－3，加入9 mg?L－1硫离子1 h后， ND和NA分别上升到4.52×1020和7.02×1020 cm－3.极化曲线测定表明9 mg?L－1硫离子使不锈钢钝态电流增大了近一倍.
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| 关 键 词： | Mott-Schottky图 电化学阻抗谱(EIS) 钝化膜 不锈钢 硫离子 |
| 收稿时间： | 2002-09-11 |
| 修稿时间： | 2002年9月11日 |
The Spontaneous Passivation of Stainless Steel in Simulated Cooling Water and the Influence of Sulfide |
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| 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(5):403-407. |
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| Authors: | Ge Hong Hua Zhou Guo Ding Wu Wen Quan |
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| Institution: | Electrochemical Research Group, Shanghai College of Electric Power, Shanghai 200090;College of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093 |
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| Abstract: | 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. |
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| Keywords: | Mott Schottky plot Electrochemical impedance spectroscopy Passive film Stainless steel Sulfide |
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