Corrosion Experiments were carried out under iron carbonate scale-forming conditions in a large diameter, multiphase flow system. Both oil/water and oil/water/gas slug flows were studied at pressures
up to 0.79 MPa and temperatures of 60°C and 80°C. It was found that with increasing iron concentration, the corrosion rates were reduced to negligible values in oil/water flows. However, significant corrosion was seen in slug flow with clear evidence of damage to the corrosion product layer due to impact and possible collapse of gas bubbles and a considerable reduction in the layer thickness. Details of corrosion rates and corrosion coupon surface analysis are presented. Keywords: Scaling conditions, corrosion product layer, multiphase slug flow, carbon dioxide, sweet corrosion