用电化学方法研究了碳钢在含Cl-的磷酸盐+硼酸盐缓冲溶液中，在孔蚀电位附近恒电位条 件下电流波动的特征.在孔蚀电位Eb及Eb以上，恒电位和动电位极化时都观察 到电流波动现象，在本底电流并未连续增大的情况下多次电流波动后可观察到蚀孔，表明在 此体系中围绕表面的孔蚀活性点可能会发生反复的亚稳态局部溶解.恒电位下随时间延长电 流波动频率降低，电流波动峰值服从正态分布；电位升高导致本底电流和电流波动峰值电流 均增大，但对波动频率无明显影响.电流波动峰形状为快速上升，缓慢下降，即孔蚀活性点 快速溶解，慢速再钝化，根据电流下降部分计算的再钝化速率服从指数衰减形式.
The characteristics of current fluctuations on carb on steel in phosphate+borate buffer solutions containing chloride were studied u sing electrochemical methods.Current fluctuations were recorded at pitting poten tial Eb or above Eb during both potentiostatic and potentiodynamic polarization. Although the background current did not show continuous increase,pits were obser ved after the test,which may be the result of repeated metastable dissolution ar ound the active sites on the surface.At constant potential,the fluctuation frequ ency decreased with time,and the peak currents follow normal distribution.Increa sed potential led to higher peak currents,but exerted no influence on the fluctu ation frequency.All the current peaks have the type of quick increase and slow decay in exponential forms.The mechanism of pitting of mild steel in the system was discussed.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%