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Journal Articles Corrosion Science Year : 2020

A study by electrochemical impedance spectroscopy and surface analysis of corrosion product layers formed during CO2 corrosion of low alloy steel

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Abstract

In the following research, electrochemical and surface analysis techniques are used to define the main contributing factor to the protectiveness offered by a scale formed at high temperature and pH under CO 2 saturated conditions. At 80°C and pH 6.6, trace amounts of a magnetite (Fe 3 O 4) phase was identified at certain locations beneath a more dominant iron carbonate (FeCO 3) film. Furthermore, over time, the evolution of the corrosion product layer towards a very low porosity results in a "diffusion barrier" that is indicated by a positive shift in the open circuit potential and is considered key to corrosion protection.
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Dates and versions

hal-02864432 , version 1 (11-06-2020)

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Rehan de Motte, Edoardo Basilico, Rémy Mingant, Jean Kittel, Francois Ropital, et al.. A study by electrochemical impedance spectroscopy and surface analysis of corrosion product layers formed during CO2 corrosion of low alloy steel. Corrosion Science, 2020, 172, pp.108666. ⟨10.1016/j.corsci.2020.108666⟩. ⟨hal-02864432⟩
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