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Journal Articles Materials Chemistry and Physics Year : 2015

CO2 corrosion resistance of carbon steel in relation with microstructure changes

Abstract

The microstructural effects on the corrosion resistance of an API 5L X42 carbon steel in 0.5 M NaCl solution saturated with CO2 was investigated. Four microstructures were considered: banded (B), normalized (N), quenched and tempered (Q&T), and annealed (A). Electrochemical measurements (polarization curves and electrochemical impedance spectroscopy) were coupled with surface analyses (scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS)) to characterize the formation of the corrosion product layers. Electrochemical results revealed that corrosion resistance increased in the following order: B < N < Q&T < A. From the polarization curves it was shown that specifically, cathodic current densities were affected by microstructural changes. SEM images indicated that ferrite dissolved earlier than cementite and a thin layer of corrosion products was deposited on the steel surface. XPS analyses revealed that this layer was composed of a mixture of iron carbonate and non-dissolved cementite. It was also found that the quantity of FeCO3 content on the steel surface was greater for Q&T and A microstructures. These results, in agreement with the electrochemical data, indicate that the deposition mechanism of iron carbonate is closely related to the morphology of the non-dissolved cementite, determining the protective properties of the corrosion product layers.
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Dates and versions

hal-01167930 , version 1 (25-06-2015)

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Nathalie Ochoa, Carlos Vega, Nadine Pébère, Jacques Lacaze, Joaquín L. Brito. CO2 corrosion resistance of carbon steel in relation with microstructure changes. Materials Chemistry and Physics, 2015, vol. 156, pp. 198-205. ⟨10.1016/j.matchemphys.2015.02.047⟩. ⟨hal-01167930⟩
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