Electrochemical dissolution of immobilized α-(FexCr1-x)2O3 microparticles

被引：14

作者：

Grygar, T ^{[1
]}

Bezdicka, P

Caspary, EG

机构：

[1] Acad Sci Czech Republ, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic

[2] Joint Lab Mossbauer Spect, Prague 18000, Czech Republic

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1999年 / 146卷 / 09期

关键词：

D O I：

10.1149/1.1392460

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Solid solutions of alpha-Fe2O3 (hematite) and alpha-Cr2O3 (eskolaite), alpha-(FexCr1-x)(2)O-3, were synthesized by precipitation of ferric and chromic salts by sodium hydroxide and heating the obtained solids at 1000 degrees C. The phase purity of the samples was checked by X-ray diffraction and Mossbauer spectroscopy. The oxidative and reductive dissolution of alpha-(FexCr1-x)(2)O-3 was studied using voltamme try of micropatricles immobilized on graphite electrode in 0.1 M HClO4. The anodic dissolution of alpha-(FexCr1-x)(2)O-3 was effectively suppressed at x > 0.5, whereas cathodic dissolution was suppressed at x < 0.75. The results are discussed with respect to the stability of Fe, Cr oxide layers that are responsible for the corrosion resistance of austenitic steels in hydrothermal environment. (C) 1999 The Electrochemical Society. S0013-4651(98)11-063-7. All rights reserved.

引用

页码：3234 / 3237

页数：4

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