Corrosion Behavior of carbon steel in carbon dioxide-loaded activated methyl diethanol amine solution

被引：13

作者：

Khorrami, M. R. ^{[1
]}

Raeissi, K. ^{[1
]}

Shahban, H. ^{[2
]}

Torkan, M. A. ^{[2
]}

Saatchi, A. ^{[1
]}

机构：

[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran

[2] Isfahan Refinery, R&D, Esfahan, Iran

来源：

CORROSION | 2008年 / 64卷 / 02期

关键词：

activated methyl diethanol amine; electrochemical impedance spectroscopy; carbon steel; passive film; potentiostatic; Warburg diffusion;

D O I：

10.5006/1.3280680

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Corrosion behavior of carbon steel in carbon dioxide (CO2)-loaded activated methyl diethanol amine (a-MDEA) solution was investigated using Tafel polarization and alternating current (AC) impedance techniques. Results indicated that a passive iron carbonate (FeCO3) film is formed after a critical current density in all cases. A projection was observed on the passive region of Tafel (E-Log i) plots in 10 wt% solution at noble potential and at higher temperatures. X-ray diffraction (XRD) showed the projection is produced due to the iron oxide-hydroxide (alpha-FeO center dot OH) formation in the passive film of FeCO3. The corrosion rate of carbon steel increased by increasing the a-MDEA concentration, but a more stable passive film could be formed. At the projection potential, dissolution is under control of semi-infinite diffusion of released ions, and the mechanism does not change by increasing the concentration and temperature.

引用

页码：124 / 130

页数：7

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