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51313-02291-Iron Carbide & Its Influence on Formation of Protective Iron Carbonate in CO2 Corr. of Mild Steel

Picture for Iron Carbide & Its Influence on Formation of Protective Iron Carbonate in CO2 Corr. of Mild Steel
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Product Number: 51313-02291-SG
ISBN: 02291 2013 CP
Author: Fernando Farelas
Publication Date: 2013
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Steel microstructure plays an in important role in the corrosion behavior carbon steels exposed to CO2 environments. The present research studies the effect of steel microstructure in the formation of porous iron carbide layers (Fe3C) and their influence on the formation of protective iron carbonate (FeCO3) layers. C1018 and X65 carbon steels with ferrite - pearlite and tempered martensite microstructures respectively were exposed to a 3 wt.% NaCl CO2 saturated solution at pH 6 and 80oC in laminar flow. The corrosion behavior was monitored by linear polarization resistance (LPR) while the interfacial changes were evaluated by electrochemical impedance spectroscopy (EIS). Electrochemical measurements were supported by surface analytical techniques (SEM and EDS). A porous Fe3C layer was observed for both steels during the first days of exposure although morphology was different due to the steel microstructure. With time the iron carbide layers observed for both steels acted as a diffusion barrier for ferrous and carbonate ions resulting in a high surface pH so that when the solubility limit of FeCO3 was exceeded a protective FeCO3 formed within the porous layer regardless of the steel microstructure.

 

Keywords: CO2 corrosion carbide iron carbonate steel microstructure

Steel microstructure plays an in important role in the corrosion behavior carbon steels exposed to CO2 environments. The present research studies the effect of steel microstructure in the formation of porous iron carbide layers (Fe3C) and their influence on the formation of protective iron carbonate (FeCO3) layers. C1018 and X65 carbon steels with ferrite - pearlite and tempered martensite microstructures respectively were exposed to a 3 wt.% NaCl CO2 saturated solution at pH 6 and 80oC in laminar flow. The corrosion behavior was monitored by linear polarization resistance (LPR) while the interfacial changes were evaluated by electrochemical impedance spectroscopy (EIS). Electrochemical measurements were supported by surface analytical techniques (SEM and EDS). A porous Fe3C layer was observed for both steels during the first days of exposure although morphology was different due to the steel microstructure. With time the iron carbide layers observed for both steels acted as a diffusion barrier for ferrous and carbonate ions resulting in a high surface pH so that when the solubility limit of FeCO3 was exceeded a protective FeCO3 formed within the porous layer regardless of the steel microstructure.

 

Keywords: CO2 corrosion carbide iron carbonate steel microstructure

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