采用电化学噪声（Electrochemical Noise, ECN）和 极化曲线方法研究了16Mn钢在Na2CO3+NaHCO3溶液中的亚稳态与稳态点蚀特征.测量 加入Cl-前后，由亚稳态点蚀形核引起的ECN谱特征.发现电位与电流噪声具有典型的快速 增加缓慢恢复的暂态峰（Transient）特征，且随Cl-的增加，亚稳态蚀点溶解电流与寿命 显著增加.丝束电极（Wire Beam Electrode, WBE）的研究表明，钝化电极表面电流与电位 分布随Cl-加入向不均匀发展，同时Cl-对钝化膜的侵蚀也使碳钢钝化区宽度显著减小.
The fluctuation of potential and current of 16Mn car bon steel were monitored in NaHCO3+Na2CO3 aqueous solution with and withou t 0.5 mol/L Cl-.Noise current and noise potential patterns were experimentally observed which related to the incubation and die of metastable pitting，where t he “transient” in ECN had generally characteristic of “fast down and slow rec overy”.The amplitude and lifetime of transient in ECN increased when addition o f 0.5 mol/L NaCl.In addition，Surface potential and current mapping on passive f ilm of 16Mn steel was also measured simultaneously by wire beam electrode,and th e result showed the number of surface active points increased with addition of C l-.Furthermore，dynamic potential scanning indicated that the addition of 0.5M Cl- would cause the passive film breakdown at more negative potential.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%