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51313-02149-Investigation of Pseudo-Passiviation Behavior of Iron Carbonate Layer in CO2 Corrosion

Picture for Investigation of Pseudo-Passiviation Behavior of Iron Carbonate Layer in CO2 Corrosion
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Product Number: 51313-02149-SG
ISBN: 02149 2013 CP
Author: Wei Li
Publication Date: 2013
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The corrosion product layer developed in sweet conditions is known to play a role in the retardation of corrosion but may also lead to initiation of localized corrosion. An incomplete pseudo-passive layer can initiate and propagate localized corrosion by developing a galvanic cell between a bare steel surface and a surface that is covered with iron carbonate layer due to their respective potentials. The mechanisms related to this phenomenon require further study. In this work a pseudo-passive effect of the CO2 corrosion product layer on the steel surface has been investigated at 80oC over a relatively wide bulk pH range. Experiments were done in a 2L glass cell using a three electrode system. Electrochemical techniques such as linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) were conducted and surface analysis techniques (SEM XRD TEM) were used to confirm the composition and structure of the pseudo-passive layer. Experimental results show that a pseudo-passive layer did form with a positive open circuit potential shift and a significantly retarded corrosion rate in systems at 80oC 0.53 bar CO2 pH 6.0 and above; but a stable and protective pseudo-passive layer could not be achieved at pH 5.6 or lower.

Keywords: CO2 corrosion product layer; pseudo-passivation; electrochemical techniques; SEM; XRD; TEM.
 

The corrosion product layer developed in sweet conditions is known to play a role in the retardation of corrosion but may also lead to initiation of localized corrosion. An incomplete pseudo-passive layer can initiate and propagate localized corrosion by developing a galvanic cell between a bare steel surface and a surface that is covered with iron carbonate layer due to their respective potentials. The mechanisms related to this phenomenon require further study. In this work a pseudo-passive effect of the CO2 corrosion product layer on the steel surface has been investigated at 80oC over a relatively wide bulk pH range. Experiments were done in a 2L glass cell using a three electrode system. Electrochemical techniques such as linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) were conducted and surface analysis techniques (SEM XRD TEM) were used to confirm the composition and structure of the pseudo-passive layer. Experimental results show that a pseudo-passive layer did form with a positive open circuit potential shift and a significantly retarded corrosion rate in systems at 80oC 0.53 bar CO2 pH 6.0 and above; but a stable and protective pseudo-passive layer could not be achieved at pH 5.6 or lower.

Keywords: CO2 corrosion product layer; pseudo-passivation; electrochemical techniques; SEM; XRD; TEM.
 

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