THE INFLUENCE OF SULFATE-IONS ON THE SURFACE-ENHANCED RAMAN-SPECTRA OF PASSIVE FILMS FORMED ON IRON

被引：77

作者：

GUI, J

DEVINE, TM

机构：

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

来源：

CORROSION SCIENCE | 1994年 / 36卷 / 03期

关键词：

D O I：

10.1016/0010-938X(94)90036-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Surface enhanced Raman (SER) spectra were obtained from the passive films formed on iron in aqueous solutions of sulfate (pH 5 and pH 10) and borate + sulfate. The results indicate that the identities of the passive films are dependent on the pH of the solution, the identity of the anions present and the potential of iron. Either Fe(OH)2, or a species similar to Fe(OH)2 and which is produced by the oxidation of Fe(OH)2, was present in all the films including those formed in the active region of the sulfate solution at pH 5. In the passive state additional species were present but could not always be unambiguously identified. The passive films formed in the sulfate solutions of pH 5 and pH 10 appeared to contain a mixture of Fe3O4 and gamma-Fe2O3. In the sulfate + borate solution the passive film contained alpha-Fe2O3. The widths of the peaks in the SER spectra suggested that the constituents in the films were either microcrystalline or amorphous. In addition, in all solutions examined sulfate ions and, when present in the bulk solution, borate ions, appear to adsorb on the surface of the passive films. In the case of the films formed in the sulfate solution of pH 5, sulfate ions were covalently bonded in the films in a bidentate configuration.

引用

页码：441 / 462

页数：22

共 37 条

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