51313-02358-Effect of Calcium Ion on the Formation and Protectiveness of Iron Carbonate Layer in CO2 Corrosion

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Product Number: 51313-02358-SG

ISBN: 02358 2013 CP

Author: Saba Navabzadeh Esmaeely

Publication Date: 2013

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Among the known options in carbon capture and storage (CCS) injection and storage of CO2 in deep saline aquifers has the potential to cause casing corrosion due to the direct contact between injected CO2 and the saline aquifer with highly concentrated aqueous salts such as NaCl and CaCl2. Thus in the present study the effect of Ca2+ on the CO2 corrosion behavior of carbon steel was investigated in simulated saline aquifer environments (1 wt.% NaCl 80oC pH 6.6) with different concentrations of Ca2+ (10 100 1000 and 10000 ppm). Electrochemical methods (OCP and LPR measurements) and surface analysis techniques (SEM EDS and XRD) were used to evaluate the corrosion rate and morphology of corrosion products with time. The results showed that with low concentrations of Ca2+ (10 and 100 ppm) the corrosion rate decreased with time due to the formation of protective FeCO3 and/or FexCayCO3 (x + y =1). However the addition of high concentrations of Ca2+ (1000 and 10000 ppm) resulted in the change of corrosion product from protective FeCO3 to non-protective CaCO3 and increasing the corrosion rate with time. While general corrosion rate was high for both 1000 and 10000 ppm Ca2+ surface analysis data revealed a different surface morphology for these tests which has lead to pitting corrosion for the test with 10000 ppm Ca2+.