The high-temperature corrosion of Fe-28Al and Fe-18Al-10Nb in a H2/H2S/H2O gas mixture

被引：14

作者：

Kai, W ^{[1
]}

Lee, SH ^{[1
]}

Chiang, DL ^{[1
]}

Chu, JP ^{[1
]}

机构：

[1] Natl Taiwan Ocean Univ, Inst Mat Engn, Chilung 20224, Taiwan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1998年 / 258卷 / 1-2期

关键词：

corrosion; Fe-28Al; Fe-18Al-10Nb; Nb; Al2O3; Nb3S4; Nb2O5; FexNbS2;

D O I：

10.1016/S0921-5093(98)00927-7

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The corrosion behavior of Fe-28Al and Fe-18Al-10Nb (at.%) was investigated over the temperature range of 700-900 degrees C in a H-2/H2S/H2O gas mixture with varying sulfur partial pressures of 10(-2)-10(3) Pa and oxygen partial pressures of 10(-19)-10(-15) Pa. Ln general, the corrosion kinetics followed the parabolic rate law although two-stage kinetics were noted in some cases. The steady-state parabolic rate constants increased with increasing temperature. Based on the equivalent addition (28 at.%) of alloying elements, it was found that Fe-18Al-10Nb exhibited a better corrosion resistance, being 2.1-3.9 orders of magnitude lower than Fe-28Al (depending on temperature). The scales formed on Fe-28Al consisted of mostly FeS, alpha-Al2O3, and minor FeAl2S4, while the scales formed on Fe-18Al-10Nb consisted of mostly alpha-Al2O3, Nb3S4, Nb3O5, and minor FexNbS2 (FeNb2S4/FeNb3S6) at T less than or equal to 800 degrees C and of alpha-Al2O3, Nb3S4, and FexNbS2 at 900 degrees C. The formation of Al2O3 and Nb3S4 resulted in the significant reduction of corrosion rates. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：146 / 152

页数：7

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