| 碳钢在Na2CO3-NaHCO3溶液中的阳极极化行为 |
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| 引用本文： | 赵景茂,左禹. 碳钢在Na2CO3-NaHCO3溶液中的阳极极化行为[J]. 化工学报, 2005, 56(8): 1526-1529 |
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| 作者姓名： | 赵景茂 左禹 |
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| 作者单位： | 北京化工大学材料科学与工程学院，北京 100029 |
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| 摘 要： | 使用动电位极化技术研究了碳钢在Na2CO3-NaHCO3溶液中的阳极极化行为，测试结果表明，阳极极化曲线上存在着两个电流峰和两个钝化区.与在NaHCO3溶液中相比，碳钢在Na2CO3-NaHCO3溶液中的极化曲线上的第一个钝化区变得更宽.当增加NaHCO3浓度后，两个峰值电位均往正方向移动，表明碳钢的钝化能力降低.研究发现，第二个电流峰对应的电位与NaHCO3浓度的对数呈良好的线性关系.根据铁在Na2CO3-NaHCO3溶液中的腐蚀热力学，推测该峰处发生的反应可能是：3FeCO3+4H2O---Fe3O4+3HCO-3+5H++2e.XPS分析表明铁电极表面主要由二价铁和三价铁的氧化物组成，进一步支持了以上反应.
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| 关 键 词： | 阳极极化 碳钢 Na2CO3-NaHCO3溶液 氧化物 |
| 文章编号： | 0438-1157（2005）08-1526-04 |
| 收稿时间： | 2004-08-30 |
| 修稿时间： | 2004-08-302004-09-01 |
Anodic polarization behavior of carbon steel in Na2CO3-NaHCO3 solution |
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| ZHAO Jingmao,ZUO Yu. Anodic polarization behavior of carbon steel in Na2CO3-NaHCO3 solution[J]. Journal of Chemical Industry and Engineering(China), 2005, 56(8): 1526-1529 |
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| Authors: | ZHAO Jingmao ZUO Yu |
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| Abstract: | The anodic polarization curves of mild steel were measured potentiodynamically in sodium carbonate solution containing different concentrations of sodium bicarbonate, and the surface products of steel were analyzed with XPS. The potentiodynamical studies showed two anodic peaks and two passive zones present in all the polarization curves. Compared to those obtained in NaHCO3 solutions, the first passive zones of the polarization curves in Na2CO3-NaHCO3 solutions became wider and clearer. Both of the potentials at two peaks shifted to positive direction after adding bicarbonate in carbonate solution, which meaned bicarbonate ions could weaken the passivation of iron in carbonate solutions. A good linear relationship was found between the potential at the second peak and the logarithm of the concentration of bicarbonate ions. According to the electrochemical thermodynamics of iron in Na2CO3-NaHCO3 solution, the following reaction might take place at the second peak:3FeCO3+4H2O---Fe3O4+3HCO-3+5H++2e.The results with XPS showed that the iron surface consisted mainly of ferrous and ferric oxides, which further supported the above reaction. |
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| Keywords: | anodic polarization carbon steel Na2CO3-NaHCO3 solution iron oxide |
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