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51313-02188-Corrosion Films Formed in CO2 Saturated Conditions on In-Situ Corrosion of X65 Pipeline Steel

Product Number: 51313-02188-SG
ISBN: 02188 2013 CP
Author: Xinming Hu
Publication Date: 2013
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This work has been carried out to investigate the effect of iron carbonate films formed on X65 pipeline steel on the material degradation mechanisms in erosion-corrosion. The experimental procedure includes a pre-corrosion process to form four types of corrosion films in different conditions: transparent cementite iron carbonate and iron carbonate/cementite. The erosion-corrosion experiments were conducted using a recirculating impingement apparatus. In-situ corrosion rate values were monitored at a flow velocity of 7m/s 50oC with addition of 800 mg/L sand in Forties brine saturated with CO2. The effects of the pre-formed films and the mechanisms relating to corrosion and erosion-corrosion processes have been identified and analysed using surface analysis techniques (SEM AFM) and nano-indentation. It has been found that the erosion-corrosion conditions in this study severely damage the pre-formed corrosion films and hinder the re-formation of the protective films. The implications of this for successful use of X65 pipeline steel in high energy sand-containing fluids are discussed.

This work has been carried out to investigate the effect of iron carbonate films formed on X65 pipeline steel on the material degradation mechanisms in erosion-corrosion. The experimental procedure includes a pre-corrosion process to form four types of corrosion films in different conditions: transparent cementite iron carbonate and iron carbonate/cementite. The erosion-corrosion experiments were conducted using a recirculating impingement apparatus. In-situ corrosion rate values were monitored at a flow velocity of 7m/s 50oC with addition of 800 mg/L sand in Forties brine saturated with CO2. The effects of the pre-formed films and the mechanisms relating to corrosion and erosion-corrosion processes have been identified and analysed using surface analysis techniques (SEM AFM) and nano-indentation. It has been found that the erosion-corrosion conditions in this study severely damage the pre-formed corrosion films and hinder the re-formation of the protective films. The implications of this for successful use of X65 pipeline steel in high energy sand-containing fluids are discussed.

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