The effect of acetic acid on the pit propagation in CO2 corrosion of carbon steel

J. Amri, E. Gulbrandsen, R. P. Nogueira

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

The role of acetic acid (HAc) on the pit growth in CO2 corrosion of carbon steel pipelines is studied by means of an artificial pit electrode. The current flowing between the artificial pit 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 pit imposed a potential difference that triggered the pit growth. The pit did not grow in absence of HAc. The pit growth was self-sustained only to a certain pit depth, beyond which the dissolution current at the bottom of the pit vanished. This is in good agreement with field observations mainly in the case of top-of-line corrosion phenomena.

Original languageBritish English
Pages (from-to)200-203
Number of pages4
JournalElectrochemistry Communications
Volume10
Issue number2
DOIs
StatePublished - Feb 2008

Keywords

  • Acetic acid
  • Carbon steel
  • CO corrosion
  • Top-of-line corrosion
  • ZRA

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