Corrosion rate of iron and iron-chromium alloys in CO2 medium

被引：75

作者：

Carvalho, DS

Joia, CJB

Mattos, OR

机构：

[1] Univ Fed Rio de Janeiro, COPPE, PEMM, EE,Lab Corrosao Prof Manoel de Castro, BR-21945970 Rio De Janeiro, Brazil

[2] PETROBRAS CENPES, BR-21949900 Rio De Janeiro, Brazil

来源：

CORROSION SCIENCE | 2005年 / 47卷 / 12期

关键词：

CO2; corrosion; EIS; acetate; NaCl; iron and iron-chromium alloys;

D O I：

10.1016/j.corsci.2005.05.052

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present paper corrosion of iron (99.95%) and iron-chromium alloys (1-5% Cr) were investigated by mass loss and ac impedance. These low-chromium content alloys have been proposed as an intermediate corrosion-performance material between C-steel and stainless steels to be used in oil plants. It was observed that small contents of chromium in the alloy decrease the corrosion attack only in very specific pH range 4 < pH < 5. In CO2 medium, mass loss showed a linear behaviour with respect to time whereas in the presence of acetate the results were not monotonic. By ac impedance, it was found that R-P(-1) and R-t(-1) vary proportionally with respect to mass loss. A discussion concerning the online monitoring of the corrosion rate is presented. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：2974 / 2986

页数：13