| HCO3-/CO32-浓度对X70管线钢钝化行为的影响 |
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| 引用本文： | 胡钢,许淳淳,池琳,王紫色,黄杰. HCO3-/CO32-浓度对X70管线钢钝化行为的影响[J]. 北京化工大学学报(自然科学版), 2004, 31(3): 43-47 |
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| 作者姓名： | 胡钢 许淳淳 池琳 王紫色 黄杰 |
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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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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 采用动电位扫描法、循环伏安法研究了X70管线钢在不同浓度的NaHCO3 /Na2CO3 溶液中的钝化行为。结果表明,材料在该体系中具有明显的钝化现象,随溶液浓度升高,X70钢钝化变得困难。利用Parkins的边界条件,确定了X70钢在1mol/LNaHCO3 +0.5mol/LNa2CO3 溶液中发生应力腐蚀开裂的敏感电位区间为-560～-650mV。X70钢在钝化过程中表面发生的反应比较复杂,电极过程包含Fe的阳极溶解、生成钝化膜、钝化膜的化学溶解三种过程。用X-射线衍射分析了X70钢在活化钝化过渡区表面钝化膜的组成,证实了对电极过程的分析。
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| 关 键 词： | X70管线钢 极化曲 循环伏安 X-射线衍射 X70管线钢 极化曲 循环伏安 X-射线衍射 |
| 收稿时间： | 2003-11-06 |
| 修稿时间： | 2003-11-06 |
Influence of concentration of HCO-3/CO2-3 on passivation behavior of X70 pipeline steel |
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| Hu Gang ;Xu Chun-chun;Chi Lin ;Wang Zi-se; Huang Jie. Influence of concentration of HCO-3/CO2-3 on passivation behavior of X70 pipeline steel[J]. Journal of Beijing University of Chemical Technology, 2004, 31(3): 43-47 |
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| Authors: | Hu Gang Xu Chun-chun Chi Lin Wang Zi-se Huang Jie |
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| Affiliation: | College of Materials Science and Engineering; Beijing University of Chemical Technology; Beijing 100029; China |
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| Abstract: | The passivation behavior of X70 pipeline steel in NaHCO3 /Na2CO3 solution with different concentrations was studied by the potentialdynamic method and the cyclic voltammetry technology. The results show that the passivation phenomena occurr on the material surface and the passivating process become difficult with increase in solution concentration. According to Parkins boundary condition, the sensitive potential range to stress corrosion of X70 steel in 1mol/L NaHCO3+0 5mol/L Na2CO3 solution was determined as -560~-650mV.The reaction occured on the surface of X70 steel were very complicates during the passivation process.The electrode process consisted of three step as:the anodic dissolving of Fe,the formation of passive film and the chemical dissolving of passive film.By XRD technology the composition of the passive film on the surface film of X70 steel formed in the potential range of active- passive transition was analyzed and the electrode process were confirmed. |
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| Keywords: | X70 pipeline steel polarization curve cyclic voltammetry XRD |
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