CORROSION MECHANISM OF STEEL P110 IN CO2-CONTAINING SIMULATED OILFIELD BRINE

J Chin Soc Corr Pro

1999, Vol. 19

Issue (5): 285-290 DOI:

Research Report

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CORROSION MECHANISM OF STEEL P110 IN CO2-CONTAINING SIMULATED OILFIELD BRINE

Jing Li;;;

北京科技大学 636#信箱

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Abstract EIS and other techniques were used to study the behavior of steel P110 in CO2-containing simulated oilfield brine at room temperature and pressure.It was found that the most important reason of H2CO3 being more corrosive than a xompletely dissociated acid resulted from an additional cathodic reaction:the direct reduction of H2CO3.The impedance spectra at both open circuit potential and anodic potential presented a typical character of three time constants:a capacitive semicircle was followed by an inductuve and a small capacitive demicircle at low frequencies.This and other obxervations suggested that the active dissloution of steel P110 at relatively lower pH in the simulated fluid took place by "pH-dependent mechanism".The cathodic reactions mainly included H+ reduction,direct H2CO3 reduction,HCO3 reduction and direct H2O reduction.The dominance of four reactions in cathodic current changed with pH of the media

Key words: CO2 corrosion corrosion mechanism electrochemistry anodic reaction cathodic reaction

Received: 29 October 1998

Corresponding Authors: Jing Li

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Cite this article:

Jing Li. CORROSION MECHANISM OF STEEL P110 IN CO2-CONTAINING SIMULATED OILFIELD BRINE. J Chin Soc Corr Pro, 1999, 19(5): 285-290 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1999/V19/I5/285

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