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02273 THE ROLE OF ACETATE IN CO2 CORROSION OF CARBON STEEL: HAS THE CHEMISTRY BEEN FORGOTTEN?

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The influence of acetate ion on the rate of corrosion of carbon steel (X65) in 3 % NaCl brine saturated with carbon dioxide has been investigated using voltammetry at a rotating disc electrode. The rate of corrosion can only be understood if it is recognised that the cathodic process in the steel corrosion is affected by acetic acid.

Product Number: 51300-02273-SG
ISBN: 02273 2002 CP
Author: Yannick Garsany, Derek Pletcher, and Bill Hedges
Publication Date: 2003
Industry: Science of Corrosion
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The influence of acetate ion on the rate of corrosion of carbon steel (X65) in 3 % NaCl brine saturated with carbon dioxide has been investigated using voltammetry at a rotating disc electrode. It is shown that the rate of corrosion can only be understood if it is recognised that the cathodic process in the steel corrosion does not distinguish between the reduction of free protons and the reduction of the undissociated proton donor, acetic acid. Hence, for any brine composition it is important to consider the concentration of acetic acid as well as the pH of the brine in explaining the rates of corrosion of the steel. This requires the ability to predict the speciation of these complex solutions.

Keywords: Carbon dioxide, acetate, acetic acid, carbon steel corrosion, voltammetry.

The influence of acetate ion on the rate of corrosion of carbon steel (X65) in 3 % NaCl brine saturated with carbon dioxide has been investigated using voltammetry at a rotating disc electrode. It is shown that the rate of corrosion can only be understood if it is recognised that the cathodic process in the steel corrosion does not distinguish between the reduction of free protons and the reduction of the undissociated proton donor, acetic acid. Hence, for any brine composition it is important to consider the concentration of acetic acid as well as the pH of the brine in explaining the rates of corrosion of the steel. This requires the ability to predict the speciation of these complex solutions.

Keywords: Carbon dioxide, acetate, acetic acid, carbon steel corrosion, voltammetry.

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02235 IMPROVEMENTS ON DE WAARD-MILLIAMS CORROSION PREDICTION AND APPLICATIONS TO CORROSION MANAGEMENT

Product Number: 51300-02235-SG
ISBN: 02235 2002 CP
Author: Bert.F.M. Pots, Randy C. John, Ian J.Rippon, Maarten J.J.Simon Thomas, Sergio D. Kapusta, Magdy M. G
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This paper describes corrosion rate prediction models for the main corrosion mechanisms of carbon steel in Exploration and Production service. The models succeed earlier work by De Waard, Milliams, and Lotz.
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