A SERS INVESTIGATION OF THE PASSIVE FILMS FORMED ON IRON IN MILDLY ALKALINE-SOLUTIONS OF CARBONATE BICARBONATE AND NITRATE

被引：62

作者：

GUI, J

DEVINE, TM

机构：

[1] Department of Materials Science and Engineering, University of California, Berkeley, CA

来源：

CORROSION SCIENCE | 1995年 / 37卷 / 08期

关键词：

D O I：

10.1016/0010-938X(94)00179-A

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

ln-situ surface enhanced Raman spectra were obtained for the passive films formed on iron in two different aqueous solutions: 0.3 M NaNO3 (unbuffered pH = 10) and 0.15 M Na-2 CO3 + 0.15 M NaHCO3 (buffered pH = 10). The results indicate that the films formed in the nitrate and carbonate solutions are somewhat alike, independent of potential (over the range of -400 mV - +100 mV), and consist of a mixture of species similar to microcrystalline/amorphous Fe(OH)(2) + Fe-3 O-4/gamma-Fe-2 O-3. The results of the present and earlier studies indicate that the oxidation rate of iron is a strong function of the identity of the anion but that the passive film formed on iron in a mildly alkaline solution is nearly independent of the anion.

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页码：1177 / 1189

页数：13

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