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09284 Effect of Acetic Acid on Propagation and Stifling of Localized Attacks in CO2 Corrosion of Carbon Steel

Picture for 09284 Effect of Acetic Acid on Propagation and Stifling of Localized Attacks in CO2 Corrosion of Car
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Product Number: 51300-09284-SG
ISBN: 09284 2009 CP
Author: Egil Gulbrandsen, Jamel Amri and Ricardo Nogueira
Publication Date: 2009
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The presence of acetic acid (HAc) has been identified as one factor that may contribute to enhance localized top-of-line corrosion attacks in gas condensate pipelines. The role of HAc on the growth of localized attacks in CO2 corrosion of carbon steel pipelines was studied by means of a pre-initiated localized attack electrode assembly (“artificial pit electrode”). The current flowing between the localized attack and the outer surface was measured with a zero resistance ammeter. It is shown that the corrosion potential increases with increasing HAc concentration. Depletion of HAc inside the attack imposed a potential difference that triggered the propagation of the attack at room temperature. The attack did not propagate in absence of HAc. The growth of the attack was self-sustained only to a certain depth, beyond which the dissolution current at the bottom of the attack vanished. This is in good agreement with field observations in the case of top-of-line corrosion phenomena.

Keywords: CO2 corrosion, pipeline steel, acetic acid, localized attacks
The presence of acetic acid (HAc) has been identified as one factor that may contribute to enhance localized top-of-line corrosion attacks in gas condensate pipelines. The role of HAc on the growth of localized attacks in CO2 corrosion of carbon steel pipelines was studied by means of a pre-initiated localized attack electrode assembly (“artificial pit electrode”). The current flowing between the localized attack and the outer surface was measured with a zero resistance ammeter. It is shown that the corrosion potential increases with increasing HAc concentration. Depletion of HAc inside the attack imposed a potential difference that triggered the propagation of the attack at room temperature. The attack did not propagate in absence of HAc. The growth of the attack was self-sustained only to a certain depth, beyond which the dissolution current at the bottom of the attack vanished. This is in good agreement with field observations in the case of top-of-line corrosion phenomena.

Keywords: CO2 corrosion, pipeline steel, acetic acid, localized attacks
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