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Comparison of corrosion mechanism of low‐alloy pipeline steel used for flexible pipes at vapor‐saturated CO2 and CO2‐saturated brine conditions

Immersion experiment was carried out to illustrate the corrosion behavior of low‐alloy pipeline steel exposed to vapor‐saturated CO2 and CO2‐saturated brine conditions in terms of microstructure, corrosion kinetics, corrosion phases, macroscopic and microscopic surface morphologies. Experimental results indicate that the corrosion rate of vapor‐saturated CO2 condition is greatly lower than that of CO2‐saturated brine condition. The corrosion products of CO2‐saturated brine condition are formed uniformly on coupons surface and the ones of vapor‐saturated CO2 condition deposit in cluster. Vapor‐saturated CO2 condition is beneficial for the formation of fine corrosion products compared with CO2‐saturated brine condition. The corrosion mechanisms of vapor‐saturated CO2 and CO2‐saturated brine conditions are different, which contribute to the distinction in water chemistry. The schematic models of corrosion mechanisms of the two corrosion conditions are proposed based on experimental results.

Immersion experiments were carried out to illustrate the corrosion behavior of low‐alloy pipeline steel exposed to vapor‐saturated CO2 and CO2‐saturated brine conditions in terms of microstructure, corrosion kinetics, corrosion phases, macroscopic and microscopic surface morphologies. The results indicate that the corrosion rate of vapor‐saturated CO2 condition is greatly lower than that of CO2‐saturated brine condition.

Authors:   Z.‐G. Liu, X.‐H. Gao, L.‐X. Du, J.‐P. Li, C. Yu, Y.‐X. Wang, X.‐N. Wang
Journal:   Materials and Corrosion
Year:   2017
Pages:   n/a
DOI:   10.1002/maco.201709604
Publication date:   01-Sep-2017
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