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.

Subject
Sodium acetate, Acid concentration, Corrosion rate, Sodium chloride, Waves, Acetates, Acidity, Sodium chloride solution, Steel, Brines, Acetic acid, Risk reduction, Corrosion potential
Keywords:
Carbon dioxide, acetate, acetic acid, carbon steel corrosion, voltammetry
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2002
Association for Materials Protection and Performance (AMPP)
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