This paper presents a model of carbon dioxide corrosion in a steel straight pipe under turbulent flow, which includes protective iron carbonate film formation, film undermining, and film erosion. The flow field was discretized using a finite volume technique, with mass transport of dissolved species accounted for with an infinitely dilute solution model. The experimental results of Nesic and Lee, Corrosion 59, 616-628 (2003) were accurately predicted and transient corrosion trends for several temperatures and carbon dioxide partial pressures were determined. The model calculates thinner but denser films at higher fluid flow rates, which corresponds to the experimental trend obtained by Schmitt and Mueller, NACE International, Paper 44 (1999).