The effect of carbon steel coupon surface finishing processes on corrosion in a carbon dioxide environment with high and low salinity. The system was also tested with and without chemical inhibitors. Two surface-finishing techniques, aluminum oxide bead blasting and sandpaper polishing, were used in this study. The resulting surfaces were characterized by white light interferometry and other techniques. Brines with different salinities and different hydrodynamic conditions were studied. The corrosion rate with and without the presence of corrosion inhibitors (CIs) in the previous conditions were evaluated using linear polarization methods. In the selected high salinity condition, it was shown that the bead blasted surface promoted the deposition of calcium species, causing the corrosion rate to decline in the absence of CIs. The development of these calcium films also hindered the inhibitors’ performance. In the low salinity condition, it was found that surface finish can affect CI performance.

Subject
Surface finishing, Steel surfaces, Corrosion rate, Steel coupons, Corrosion testing, Beads, Calcium, Shear, Salinity, Corrosion inhibitors, Brines, Carbon steel, Corrosion coupons
Keywords:
surface roughness, corrosion inhibitors, interferometry
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2017
Association for Materials Protection and Performance (AMPP)
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